#general-chat

1 messages · Page 235 of 1

rapid geode
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not sure if it can bend the other way

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short ways

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i assume thats what you want for an arm

ebon dew
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if it comes to it i'll find a way, that's on my someday todo list.

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yeah looks perfect. thank you.

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1080×2160 wow just noticed the resolution. going to need to add a magnifying glass to the screen lol

rapid geode
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so my keypad area is only 6" viewable area

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hmm

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ah no, im wrong, it is 7.2"

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non of the waveshare screens will fit well. hmm

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(bezzels are to big)

wanton thistle
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me when multiple parts of a project all work like they are supposed to:

wanton thistle
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LPT: If you have different status LEDs, make a spreadsheet saying what they do. I have Red, Green and Blue LEDs, which all do something different.

blissful roost
weary fiber
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A fun challenge I’m stuck on

whole jacinth
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neat. do you want suggestions or hints?

rapid geode
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draw it in fusion and measure. 😛

dusty citrus
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doesn't exist a fan like this? if it does, what is called? it's just like a centrifugal fan but reversed, and with more air intakes

IMG_20220715_171701.jpg
weary fiber
whole jacinth
whole jacinth
# weary fiber Honestly I’ve been stuck for a while, so I’ll take all the help I can get

try looking up https://en.wikipedia.org/wiki/Problem_of_Apollonius

Problem of Apollonius

In Euclidean plane geometry, Apollonius's problem is to construct circles that are tangent to three given circles in a plane (Figure 1). Apollonius of Perga (c. 262 BC – c. 190 BC) posed and solved this famous problem in his work Ἐπαφαί (Epaphaí, "Tangencies"); this work has been lost, but a 4th-century AD report of his results by Pappus of Alex...

dusty citrus
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it's just a quick sketch of what I would want

whole jacinth
dusty citrus
thick wind
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Try searching forward or backward radial fans?

whole jacinth
dusty citrus
blissful roost
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I'd assume there's a good reason they aren't mass-produced...

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I've seen very few examples of what you mean.. but I can't find any right now.

dusty citrus
blissful roost
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Can you take a regular fan and mod it to your plan?

whole jacinth
blissful roost
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Personally, I'd expect the fan to be pushing air out of any slots in the frame... But maybe it's dependent on the fan blade design..?

whole jacinth
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it looks like reversing rotation direction on a centrifugal blower doesn't reverse the flow; it just makes it less efficient

weary fiber
arctic folio
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I don't think it exists

hasty quarry
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Gosh darn it

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I've done it boys, I think I actually bricked my first AVR

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Stupid clock source bits

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What in the world do these stand for

unknown.png
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Amount of clock cycles?

static flare
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one would assume so

slim shard
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clock cycles is my guess too

hasty quarry
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I just don't know what to set my fuses to

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I have a 10 MHz external crystal and I'm just so lost on what to make the fuses to get it to work

whole jacinth
hasty quarry
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Yes, sorry

raven thunder
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Is there a recommended place to suggest stuff for Adafruit to stock?

rapid geode
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i dont think they officially read this discord

lusty fossil
harsh goblet
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Wasn't there an off topic channel? Did it go away when #general-tech showed up? Am I that late to the party

ebon dew
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honestly having both general chat and general tech is redundant. general chat is a catch all so general tech doesn't need to exist.

harsh goblet
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Yeah I'm not sure if what I was going to share was general or tech related, but I tried some python today

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It was done in rust which is kind of a tough programming environment to get used to

rapid geode
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id assume it was python related

harsh goblet
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lots of boilerplate and setup

rapid geode
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😛

ebon dew
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does it force you to indent like that. such a waste of space

harsh goblet
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Well python does enforce indentation so i tried to follow it

ebon dew
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so does circuit python. it can get overwhelming if you don't have an ultrawide monitor. 😛

harsh goblet
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you have to be able to see all those nested ifs haha

ebon dew
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congrats on getting into python. learning a new language is always fun... but mostly frustrating.

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for a function you should be able to do a carriage return and single indent

# 
def func():
  p!(
  b = 42
``` something like that
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and if that doesn't work sometimes using a + will

# 
def func():
  p!(
  + b = 42
  + println!("[a]")```
rapid geode
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why can't i code by just typing "make this motor move"

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hehe

ebon dew
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maybe someday with ai and text to speech we'll all be programming with verbal commands

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actually didn't github just make something new that's supposed to do predictive coding?

rapid geode
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like, if it can tell me theres an error in line 45... why cant it fix it too?

ebon dew
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great point, that would be pretty awesome to make correction suggestions at least.

rapid geode
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google code "did you mean the square root of pi?"

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actually, one of the things ive used (dont remember anyore which) would pop up syntax suggestions as you typed

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been a while since i did "real" coding. only use maxscript (vb script variant) and arduino lately

ebon dew
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there's a lot of IDE's that will do that but i haven't used them.

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it's the notepad++ and editplus life for me

rapid geode
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yes, notepad ftw

dusty citrus
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Hey, I feel kind of silly, but is there somewhere a solid reference book on circuit python? All I am finding are microPython books. Do I understand correctly that syntax is basically the same (and minor diffs on some modules) since CP is based on MP, but both differ in 'mechanics', like no shared states in CP, code execution is different, no running multiple files, etc.? So MP book 'will work' for CP, right? I know there is great reference on web, I just like to have paper reference.

rapid geode
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maxscript is neat though (inside 3dsmax) in that you can push some buttons and it will write out the code to access them. if you want to automate things

tardy badger
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Looks like the only version I’m seeing is the Japanese language version on the Adafruit shop

dusty citrus
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Thanks! Yeah I saw this one, I do not know Japanese ;) But I just realized that MicroPython O'Reilly book is on CP recommended books list, so that is great.

tardy badger
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This would probably cover a lot of what you want too

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Hmm.. what part of that sentence was bad…

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Anyway, that book for the circuit playground is written by one of the amazing Adafruit folks

dusty citrus
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Thank you, I found this one before but was wondering if it will not be too basic. I am not a beginner, just wanted some solid reference book. On the other hand, it is not that expensive, so may be worth a shot.

tardy badger
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Oh gotcha, I wasn’t sure what level you were going for

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Other than the books, the Adafruit learn site is also a great resource

dusty citrus
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Yeah, if I will not find what I want I may just stick to web reference ;) Thank you for help :))

ebon dew
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python, micropython, and circuit python share a lot in common. if you know basic syntax the web docs will eventually become your primary resource but the learn guide examples are super helpful especially if the project you want to do can be based on an existing example.

civic burrow
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dang not even sure where to ask my question DX. Overwhelmed

jade kayak
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hello sir can you please explain how lifi actually transfer an audio or any video through led
there are no conversion of signal requires in it?
digital data directly going through led hows that works

whole jacinth
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why are you replying to a message that's almost 4 years old?

blissful roost
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Dayum

blissful roost
whole jacinth
whole jacinth
slim shard
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I've seen this used in some "BEAM" robotics circuits

ebon dew
dusty citrus
dusty citrus
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Optical communications protocols are on my TODO list but way back-burner.

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also:

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less goose-chasing, specific to the RONJA technology, here:

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It's been around since 2001 but I'm the only person I have met who's ever brought it up in any conversation I've been in. ;)

dusty citrus
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I knew about infrared based data transfer on short distances, and I had it even in my PC years ago, but I had no idea that it is possible in long distances like that.

dusty citrus
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a connector is full of epoxy, how can I take the connector out?

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solved by brute force

waxen spire
late fulcrum
tardy badger
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Photo electronics is cool

brave copper
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Reddit auto mod bots are the worst, I had posted a little discussion about hooking up the amiga 1200 keyboard to something like the pi pico and it came in and ruined it by slapping rule 4 - how do get started

Like hello is doing some talk not allowed? I guess not, I don't care if I'm "getting started" all I need is info about hooking up a keyboard to the pi

lapis bluff
waxen spire
short pulsar
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I’ve been working on dot clock TFT support into CircuitPython using the ESP32-S3. Just in early stages but making progress. Foamyguy showed some work on his two latest streams in case you are interested. Also, there is an issue tracking the progress if you’d like to follow: https://github.com/adafruit/circuitpython/issues/6049

jade kayak
dusty citrus
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;)

hasty quarry
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So I know your body goes into anaerobic mode and makes lactic acid if you’re exercising and not getting enough oxygen. Does that imply if you improve your heart health, you will necessarily be less sore after exercising, other things equal?

late fulcrum
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Only kind of. The lactic acid accumulation makes your muscles feel tired more than sore, and is a short term effect. And it's true that better cardiopulmonary capacity can deliver more oxygen and reduce that effect. But the other soreness is due to the effects of the muscles working, and greater oxygen delivery won't particularly affect that.

hasty quarry
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Ah I see, thanks

rapid geode
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ha, just did a 20km bike climb. the trick with lactic acid (in the knees for example when biking) is to keep pushing, it goes away. as you get more fit the threshold raise, BUT, what mostly happens is you learn to push through it

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most people just "give up" when it hurts which is the mistake

late fulcrum
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It depends on my mood and what I'm trying to accomplish. If I'm aiming for strength or cardiovascular improvement, I'll just push through and keep going. However, if I'm just going somewhere or aiming for endurance, I'll shift down/slow down and reduce my current effort.

hasty quarry
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Well you see, I'm wondering about this because after not exercising properly for months, I joined US marines in their physical training routine as a guest

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I can't move

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I cannot

late fulcrum
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Oh yeah, that happens when you go from zero to sixty overnight.

rapid geode
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ha yes.

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i dont get that anymore, but i remember going to play hockey whihc i dont normally do and the next day i couldnt walk

night crescent
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Tonight the Desk of Ladyada will be at 9pm and it's The Great Search - Power-on-reset in sot23-3 , a replacement for APX803-26SAG (we are away tonight, so this is the pre-record that will go live then, enjoy!) https://youtu.be/grSPvnYrPWs

YouTube
Adafruit Industries
The Great Search - Power-on-reset in sot23-3 , a replacement for AP...

https://www.digikey.com/short/cp05vd44

Many devices and sensors like it if you give them a fancy reset pulse after power has come up, particularly displays and OLEDs! But sometime for wiring simplicity we would like to skip using a microcontroller pin, and have the breakout board autoreset on power loss. In such cases we use a 'power on reset' ...

▶ Play video
lusty fossil
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Anyone have a little personal battery or preferably 12V lighter powered vacuum for their car that they would recommend?

rapid geode
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i had a little cordless one, it was aweful. lasted maybe 4 minutes

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haha

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so, dont buy that one

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😛

lusty fossil
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oh wirecutter to the rescue

rapid geode
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waits patiently for pizza

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still dont have any good ideas for the keys on this thing yet.

panel1_v47.jpg
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hmmm

lusty fossil
rapid geode
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normally i make my own pizza from scratch, but im being lazy so i did the pzza hut deal (3 pizzas and a giant cookie).

lusty fossil
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That's a lotta pizza!

rapid geode
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nom nom

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well, its cheaper to get 3 than 1. so ill have leftovers

ebon dew
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@rapid geode how about some of those soft kitty mx keycaps. will match the cat on the big red dial.

rapid geode
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key "caps" arent the thing so much as key mechanism. i really want fully programmable lcd keys.

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but that seems, not easily done

ebon dew
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lcd keys are super expensive

rapid geode
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yeah. the full lcd behind the keys is interesting, but viewability is poor

ebon dew
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i was looking at some the other day and read some reviews of people that had full lcd keyboards and they regretted it. the key tops are smooth and flat, lcd makes spacing larger and harder to type. just a bad idea. might be ok for F-Keys or something like that.

rapid geode
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my current layout is smaller than normal (normal is 19mm, mine are 17mm)

ebon dew
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and each key is like $30, looking at about a grand for a full keyboard and in the end regretting it, no thanks.

rapid geode
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the lower goes to the 24v realtime IO directly

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yeah, price is real bad

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so if i cant get this, i need clear caps with paper labels, and rgb leds behind each one

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but that has its own complexities

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(molding the caps etc)

ebon dew
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that's probably a better way to go. might be able to make your own keycaps with resin. they have some in the store though they wouldn't fit for you the idea is valid.

rapid geode
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cast resin caps might work, but usually cast resins have poor durability vs pressed polycarbonate or acrylic

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will need to look into that

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i can cnc aluminium masters and polish them then do a rubber mould

ebon dew
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yeah resin sounds more brittle than plastic

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ahh that sounds cool

rapid geode
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prepping my upgrade over raspberry pie... pumpkin pi

p102.jpg
lusty fossil
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I'm fasting for a tri tip BBQ and I would love some raspberry pie

rapid geode
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mmm pie

lusty fossil
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Mmm tri tip

rapid geode
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doesnt eat beef

lusty fossil
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misses out tbh but no judgement on diets

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Unless you like to eat the last of species or somethint

rapid geode
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oh, i judge everybodies diets 😛

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ha

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just never liked the taste of beef though.

lusty fossil
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That's fair. It's definitely distinctive

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If you haven't tried tri tip, I recommend snagging a bite of someone else's

rapid geode
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only if it is made of gummy bears

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ooh, i have a giant cookie now (ate one pizza)

lusty fossil
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Yum!

rapid geode
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i wonder what else you can do for programmable buttons

dusty citrus
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besides patents that are crazy expensive for my pockets, licenses that do use copyright like openhw, what else there is?

late fulcrum
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Trademarks and registrations come to mind.

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There are also subcategories of patents like "design patents" that cover the æsthetic qualities of something instead of its operation.

rapid geode
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design trademark. and those wont be respected outside of the country you are in

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so hardly worth the money

late fulcrum
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It does, of course, depend on what you're trying to protect, and where. Enforcement of patents in other countries is variable as well. And the disappointing truth is that the enforcement is generally not done for you, but you have to pursue it yourself (although there are exceptions like when Customs & Border Patrol seized a shipment of voltmeters because they were grey and yellow, and that combination was trademarked by Fluke).

rapid geode
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yeah, megacorps have to go nuts, cause trademark is defend or lose. but they pay tens of millions to do that

late fulcrum
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Exactly. I'm named in a couple of US patents, but I have no illusions they'll give me any revenue nor protection.

rapid geode
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all i have is my cat logo to protect. beyond that, i do not see spending any money.

whole jacinth
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in the US, i think you don't have to register a trademark, but it's helpful (maybe required?) if you want to recover damages for infringement

rapid geode
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recovering damages is unlikely. cease and desist is about all you will manage

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which might be enough

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like i could send one to christine for that 😛

3.webp
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haha

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but what would be the point?

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(i actually bought some for my niece)

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the only thing that you want to avoid in the end is having other people sell their product as yours (where the customer thinks they bought yours but it is just a stolen look and logo)

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everything else, you cant stop

dusty citrus
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also one last question:
doesn't exist like any state that allows you do patent stuff for free, under the condition that they can use it as much as they want, while they give you a % of the profits or something alike?

rapid geode
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O_o

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ya lost me

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you can patent a thing, then license it out. but its on you to do the patent and defend it.

dusty citrus
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I mean what I would care most is having a name on it and making some money, then I wouldn't really care who uses it and who doesn't
patents look like a pain in the butt unless you're a corporate
open licensing I don't like them
the general design thing as you said looks useless

rapid geode
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ah

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yeah, you dont have much choice. you need to "own" it to sell it.

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open hw type lic is copyright though, thats different. there is not open patents or trademarks.

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what is the item anyway, a physical finished consumer product?

dusty citrus
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it's not finished yet but it works

rapid geode
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no, i mean, the end result. a product you will sell, like an iphone or a blender.

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vs, plans, or kits etc

dusty citrus
rapid geode
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k

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i make cnc machines for example. i have no intent to patent or protect any of it, except my own logo.

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but, a cnc machine is difficult for someone to copy and sell for half the price as well.

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so it is a calculated decision

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it does however mean my "company" doesnt own anything other than production, so im not likely to sell out for big money at some later date.

dusty citrus
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I can't use home heaters as coolers right?
idk maybe by making flow cold water or like a bigger conditioner?

even the fan is blowing hot air

late fulcrum
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Depends on the heater, but most of the are just a resistive heating element which can't be made to cool. There are a few that are heat pumps that could do some cooling, but they'd need a way to vent the waste heat (spot coolers normally just vent the heat into the house and make things worse)

tardy badger
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My favorite thing is being woken up before 1am to the carbon monoxide alarm going off.

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No apparent source of it

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Thankfully everyone is okay but very strange

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Yeah, fire department found very high levels on our top floor

tardy badger
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Looks like the the gas line is leaking somehow

drowsy zephyr
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So, to EEs in the US, for a master's electrical engineering course, where should i continue?
Caltech, Stanford, or somewhere else?
MIT? I don't think im ready for it yet, ahahahaha

tardy badger
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Look for state colleges with EE programs that are accepting international students

drowsy zephyr
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any recommendations, im applying for a national scholarship

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because i don't know any good or certified universities outside of the usual big ones like MIT or Caltech

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so i mostly rely on hearsay

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So other than the big ones, any other good EE colleges, something rather high on the QS ranks perhaps?

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or something that offers unique experiences?

ebon dew
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UC Berkeley, California Institute of Technology, Cornell, I mean there are plenty out there to find with just a bit of research.

hard estuary
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Purdue is an engineering school

dusty citrus
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I can't say much, but in my understanding they are mostly the same, name aside
I would check the formative path, and your teachers portfolios(check their background), so you know what to expect
if I was to restart, I would exploit a school to get a visa to the state that you do like most

tardy badger
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A vast majority of engineering schools at state universities are accredited, but not all have openings for international students

vestal pier
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if you have a specific area/topic that you are interested in, you could try to zero in on schools that cater to that specialty, but that's going to take some research effort

dusty citrus
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Hi :),

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First: im from germany, so sorry for my bad english ^^ i had an problem,... i bought an "Adafruit CP2102N Friend USB to Serial Converter Datarate 3Mbps USB-C 5335" and my computer doesnt regognise it 😦

thick wind
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What kind of computer?

dusty citrus
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windows 11 64 bit

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tower

thick wind
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Have you tried a different USB-C cable? Charge-only cables are pretty common these days, so unless you've used it with another device before...

dusty citrus
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jeah

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i tried

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okay, nevermind... these were broken -_- now it works, but the rx & tx leds dont work XD

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i cant programm any microcontroler, the cable is okay and my computer finds the programmer

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i dont know whats wrong with this thing.... TX led just blinks in long time(0.2s on then 10s off) and the sketch istn loading up to the microcontroler

ebon dew
tardy badger
ebon dew
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no feedback on the product page 😦

tardy badger
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Link works for me

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It took me to the silabs driver page

ebon dew
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weird, it 404's for me in the link on the product page and learn guide.

tardy badger
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Must be your browser being weird

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Try another?

ebon dew
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weird, tried the same exact link again and now it's redirecting

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maybe a glitch in their matrix

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@dusty citrus did you get the serial enumeration driver or non-enumeration? i have no idea about which you should use but if one doesn't work try the other?

dusty citrus
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is installed

ebon dew
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yes but there are 2 different drivers, have you tried both?

dusty citrus
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whats the differents?

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i had these : CP210x_Universal_Windows_Driver

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im now trying the driver with Serial Enumerator :/ hope it works

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didnt work 😦

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I installed the drivers, but still nothing. only the tx led flashes sometimes

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If any of you have a solution, I look forward to seeing you in this room 🙂

split field
#

Does anyone here live in New York City (or nearby). A graphic designer that works with me just got his US Visa approved. He dreams of living there, but knows nothing about the place. Hope I can connect him with someone who can tell him about the city (where to stay, how to be safe, etc...) @grave crest or @stray wind perhaps you know someone I can refer him to? I imagine he has a thousand questions. He's very excited.

whole jacinth
fair summit
nimble ice
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prusa 3d printer came in today, I notice gummy bear bag sitting at the top of the contents, wanted candy so I started at it and oddly tasted better then the ones in stores near me.... start reading the guide and came across this

unknown.png
stray wind
rapid geode
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mmm candy

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im sure theres some law about sending that to that us

stray wind
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Long-story-short, Haribo Goldbären are quite different from the American-available counterpart Haribo Goldbears. In my experience the version available in Europe tastes significantly better.

rapid geode
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ahh

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we have so many food rules in canada so haribos here might actually be made in canada

nimble ice
stray wind
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They're still good. But.. yeah.

nimble ice
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😦 I couldn't stop after starting, and the instruction brings it up a lot XD

rapid geode
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mmm bears

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i dont like the ones in canada. probably the same as the us ones.

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hard

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i prefer sweedish berries

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or sour patch kids

nimble ice
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been really slow as last thing I want is having to go back to something later on

late fulcrum
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I ended up buying a miniature torque wrench set to assemble mine.

VENZO-Bicycle-Bike-Torque-Wrench-1-4--Allen-Key-Tool-Socket-Set-Kit-2-10-Nm.jpg
real falcon
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how much was it?

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finding one in nozzle tighten range is bit expensive

late fulcrum
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It's been a while, I think it was US$60-70. It is a nice set, I've gotten a lot of use out of it since, and nicely included the torques required to assemble a Průša

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I've also used it for things like nozzle swaps

lusty fossil
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Is it just me or is Misumi's filtering schema really bad? It tells me there are N products remaining but doesn't show them. It's practically useless.

ebon dew
#

If you need inch lbs they have them in auto parts stores, they also have them in foot lbs but they're about 2ft long and the minimum is for automotive. nm is foot lbs? yeah you can get them even more precise in in-lbs in auto parts stores.

arctic folio
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harbor freight has a bunch of torque wrenches of varying sizes

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reasonably good quality too

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though I used my FAT wrench for my prusa

unknown.png
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it's a good idea to use a torque wrench tbh, makes squaring things up more possible

still anchor
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Is any of the larger manufacturers still making polarized 3d monitors?

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It looks like everyone stoped making them because the 3d Hype is over

late fulcrum
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I think there are still synchronized ones (which are easier to make, especially with OLED technology)

dusty citrus
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only 19cents I can't complain and works more than fine lol

IMG_20220720_184448.jpg
nimble ice
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I used my general IT kit from when I worked doing breakfix, there is no adjustable torq clutch but it does have a toggle to enable a preset that is safe for most electronics I just have learned when enough is enough, honestly it was a great walkthrough on their part and I never felt lost in the steps at all

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I wrapped up last night and only now am getting to the test print as I was tired after building the kit

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thanks for all who recommended prusa on here because this thing is running perfectly

ebon dew
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that's an awesome deal for under $1 good lord.

round badge
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👋
i just joined after receiving my first adafruit card

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atsamd51 M4 feather board (i needed a M4 board)

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i originally wanted a STM card. i ordered a STM32F4 Discovery board.
As an afterthought i also ordered the microschip one from adafruit.

Then i realized that some amazing people thought it would be a good idea to hardwire a green led to the unique DAC output 😓

i managed to cancel my STM card order in time. will probably buy an adafruit STM32F4 card in the future.

ebon dew
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ohhh a place i can use my soic8 chip 🧐

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yeah blackpill has been out of stock for a while

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if you only want it for the chip expandability i believe the teensy also has solder on chip capability. https://www.adafruit.com/product/4622

PJRC Teensy 4.1 Development Board

The Teensy 4.1, like the 4.0, also features an ARM Cortex-M7 processor at 600 MHz, with an NXP iMXRT1062 chip, the fastest microcontroller available today - ten times faster than ...

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but those are out of stock too

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don't know if you've heard, there's a chip shortage out there

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feather m4 is a great board though and can be stacked with featherwings to expand capability. ❤️ the feather ecosystem.

round badge
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the teensy 4.1 don't have DAC 🤌

late fulcrum
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That's disappointing, the Teensy 3 does. However, the M0 boards have a DAC and the M4 boards have two.

hershey-adafruit.jpg
dusty citrus
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I got an STM32F407 Discovery from DigiKey about 3 weeks ago. They said something like 1 in stock, but the stock wasn't depleted after they shipped mine.

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They're not being quite accurate about that stuff.

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Try real hard to order one; you probably will succeed.

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one in stock. (not!) (many in stock)

manic stone
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Whats the best channel to share my project and hopefully ask for contributions/help/collaboration?

stray wind
nimble ice
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any of you get the adafruit nfc/rfid ring?

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I have never bought a ring before and the ring size thing is beyond me but I also don't know how reliable it is and wanted a honest opinion

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I bet I will buy it and get the wrong size though

stray wind
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There are so many ways on the internet to do it, but getting it done "professionally" is likely the most reliable way to go about it.

nimble ice
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yeah, I honestly have made paper slips and all and can't be sure if I have it correct or will order something that will get stuck XD

stray wind
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I understand. Only time I've ordered a ring, I did the fitting option, and it worked out.

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We even tried 3D printing examples, but... heh

nimble ice
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I just know I wouldn't buy anything..... X/

nimble ice
stray wind
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There you go.

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You can print rings with the appropriate inner diameters and try them out

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Rings should be easy going on, but more difficult to remove. That's the best fit, I was told.

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More effort to remove anyway.

nimble ice
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XD and if it was printed I could cut it off

stray wind
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Hahaha, yes if you needed to!

sweet phoenix
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do you guys have any intro to electronics courses you'd recommend? I know about microcontrollers pretty well but I need to brush up on PCB design and parts n stuff

round badge
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eevblog have some good video about (pretty much anything electronic)

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including pcb design, how to interpret a datasheet, bom, production, ...

sweet phoenix
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not much. I know the very basics of transistors (it's a gate) and diodes (one direction) and I can read schematics

round badge
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give a try to eevblog, it show a very broad range of stuff. and do some more specialized video too

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he have some playlist too https://www.youtube.com/watch?v=7FYHt5XviKc&list=PLvOlSehNtuHu2FviAaZaiyXwN41G4b1Lf

YouTube
EEVblog
EEVblog #600 - OpAmps Tutorial - What is an Operational Amplifier?

The most often requested video! In this tutorial Dave explains what Operational Amplifiers (OpAmps) are and how they work. The concepts of negative feedback, open loop gain, virtual grounds and opamp action. The comparator, the buffer, the inverting and non-inverting amplifiers, the differential amplifier, and the integrator circuit configuratio...

▶ Play video
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and since he's a professionnal, he doesn't stick to theory. he talk a lot about how it (doesn't) works in practice too.

night crescent
night crescent
lusty fossil
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I've read a little bit of it, not enough, it's good

sweet phoenix
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Ooo very nice, thank you

raven thunder
dull atlas
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good morning

tardy badger
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Does this seem safe? Lol E26/ E27 3 Prong Light Bulb Socket Adapter, Polarized Light Socket Outlet, Light Socket to Plug Adapter Socket Converter, Light Bulb Plug Adapter for Patio, Garage, Porch(1 Pack) https://a.co/d/ieGi9xN

E26/ E27 3 Prong Light Bulb Socket Adapter, Polarized Light Socket ...

E26/ E27 3 Prong Light Bulb Socket Adapter, Polarized Light Socket Outlet, Light Socket to Plug Adapter Socket Converter, Light Bulb Plug Adapter for Patio, Garage, Porch(1 Pack)

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Looking for safe ways to add an additional power outlet in my unfinished basement

static flare
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I don't think light sockets are earthed

rapid geode
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pretty sure that device would be illegal

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ha

tardy badger
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Oh probably

rapid geode
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light sockets are not meant to handle more than 100ish w as well

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bad idea all round

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haha

tardy badger
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I figured, just thought I’d get a second opinion

rapid geode
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why not remove the light fixture and wire an outlet.

tardy badger
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I rent

rapid geode
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oooh

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tell the landlord to update the house or youll sue them (you know, the american way of handling things)

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😛

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ok no

tardy badger
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Looks like I will do the slightly less dangerous idea and run a 20A extension cord to a plug strip

rapid geode
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oof

tardy badger
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I’m mostly running a small TV, maybe a lamp and a charger

crystal ore
rapid geode
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haha

tardy badger
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Possibly a game system. Nothing too strenuous

thick wind
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It's a neat idea, but lacks a lot of information. Definitely not a suitable substitute for an actual general-purpose outlet, but I can see it being decent if it comes with some fusing and a note about lack of proper earthing...

tardy badger
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Yeah, I’m noting in the socket that neutral and earth are connected

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Thankfully light socket manufacturers use different color screws for earth and neutral

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I probably wrong, probably isn’t the case. I don’t feel like pulling the socket out to look at the actual wiring. Either way, thanks for the advisement to not use those adapters

late fulcrum
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Neutral should only be bonded to earth in the breaker panel, at no other points.

shadow siren
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you can test this, use a plug tester plugged into the plug adapter to the light socket.

tardy badger
whole jacinth
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the screw thread of an edison-style light socket should be wired to neutral, which should be near ground potential (but not bonded to ground except at the panel). this helps reduce accidental shocks when changing bulbs, but you should not depend on it being true

tardy badger
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I only made the assumption because the socket used two different colored screws at the base. Not a bad assumption because usually neutral, ground, and hot screws are different colors. It is probably just they used a different screw at that point in assembling that one socket

shadow siren
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The screws used to be same color but modern electrical sockets now color the screws, green is usually ground, silver is neutral and copper is hot, at least I have seen this pattern in Canada

lusty fossil
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Doesn't help me much, I have to look it up every time anyways

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here being the US

rapid geode
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my house electrical wires are cloth. is this an issue?

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ha

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at least they skipped the aluminium wire craze in here

tardy badger
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Funny enough, it wasn’t the aluminum wire that was the issue

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It was the material insulating the wires

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It degraded fast

rapid geode
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ah

tardy badger
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We use aluminum for high voltage transmission lines

rapid geode
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wire is so expensive right now. ive had to replace all of it in my house. it better last 100 years

tardy badger
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Yeah, pricing is crazy

rapid geode
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i need um... 2-0? for the outside. i forget. bigger than #0.

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for like, 30 ft

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ugh

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thats a next year problem

tardy badger
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Yikes

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Last I looked, $1500 for 250ft

rapid geode
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yeash its $10 a metre per strand i think

tardy badger
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That was for 3-0 4 strand

rapid geode
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thats not allows. must be individual in conduit.

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the conduit is already there. i just need heavier wire for 200A

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i asked for 400A and they looked at me like a confused puppy

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3 phase would need a run from 2 blocks away, so im not doing that

tardy badger
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This was for a 3 phase hookup, 4 stranded, individually insulated. Or that’s what Home Depot said

rapid geode
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ah

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home depot looks at you like a confused puppy here when you ask for anything bigger than 6

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😛

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hd canada doesnt have all the services and stuff the US one fdoes

tardy badger
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Lol, I only have half an idea of what I’m doing from helping my dad run thick trunks of electrical cable

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Thankfully my dad has an associates in construction technology and has a massive book filled with general electrical code

rapid geode
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nothing was in stock here so i found a guy a few blocks from me that installs hot tubs and he had 11 feet of tech90 6/4 so i bought that from him for like $150

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and then taped one wire white

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ok for temp, but not technically allowed

tardy badger
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Lol sounds interesting

rapid geode
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yeah, dumb

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ha

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wire was black red blue green. (3 phase)

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oh well

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better than nothing

whole jacinth
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permanently label the ends of the black wire with white tape and you're good to go (at least i think older versions of the NEC allowed stuff like that)

rapid geode
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not allowed. you can use black sharpie on a white wire

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but not tape

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anyhow, doesnt matter haha

whole jacinth
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hm, maybe it was for service drops where all the wire insulation is black

rapid geode
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I found a bee

q3.jpg
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hehe

dusty citrus
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can you like bake an ai trained in virtual eviroment like ue into a real world device? if yes how?
I'm pretty new into the subject so dunno what to even look for

rapid geode
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um

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thats a pretty sweeping question

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unreal does not work quite like the real world. there is no vision, etc

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it's interactions are faked

late fulcrum
hasty quarry
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1.8432 MHz is such a golden number

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How curious...

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It seems like magic, some constant

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@whole jacinth Hey just noting something here, the chip's internal RC oscillator is more than adequate for USART

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I guess during my debugging, I made some wrong assumptions that I needed a crystal to be accurate, but no, actually

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Running at 3.3 volts should run at 1 MHz. These options are available

unknown.png
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I tested these with small messages, and they're totally fine

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Really large signals might stray off given the 0.2% error plus the inaccuracy of the RC OSC itself, but this seemed to work pretty good anyway