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Old thread is no longer bumpin' >I'm new to electronics. Where to get started? It is an art/science of applying principles to requirements. Find problem, learn principles, design and verify solution, build, test, post results, repeat. Read the datasheet. >Comprehensive list of electronics resources: https://github.com/kitspace/awesome-electronics >Project ideas: https://hackaday.io https://instructables.com/tag/type-id/category-technology/ https://adafruit.com https://makezine.com/category/electronics/ >Books: https://libgen.is/ >Principles (by increasing skill level): Mims III, Getting Started in Electronics Geier, How to Diagnose & Fix Everything Electronic Kybett & Boysen, All New Electronics Self-Teaching Guide Scherz & Monk, Practical Electronics for Inventors Horowitz and Hill, The Art of Electronics >Recommended software tools: KiCAD 6+ Circuitmaker Logisim Evolution >Recommended Components/equipment: Octopart LCSC eBay/AliExpress sellers, for component assortments/sample kits (caveat emptor) Local independent electronics distributors ladyada.net/library/procure/hobbyist.html >Most relevant YouTube channels: EEVblog W2AEW Moritz Klein >microcontroller specific problems? >>>/diy/mcg >I have junk, what do? Can it run Doom? >consumer product support or PC building? >>>/g/ >household/premises wiring? More rules-driven than engineering, try /qtddtot/ or sparky general first >antigravity and/or overunity? >>>/x/

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𓀐 @T62sd5*B: >Diodes pointing towards FB means you get the greater of the two feedback signals, diodes pointing away from FB (wth a pull-up resistors) means you get the lesser of the two feedbacks signals. i see this now (in ltspice.) thanks for saving me a frustratingly stupid board revision. >Even the small amount of ripple that gets through your low-pass filter will be hugely amplified by your error amplifiers, resulting in a bunch of output ripple. are PWM DACs more difficult than i'm perceiving? settling time doesn't really matter to me. 100 khz PWM through a 30K and 100nF RC filter should yield roughly 1.65 mv ripple peak to peak on a 3.3V input. that's close to 11 bits? afaik DACs don't have output ripple but shouldn't this ripple be functionally the same as the precision/accuracy of a 10-11 bit DAC? >Seems like Q1A is a bit superfluous Q1A exists to shut off the charging power path no matter what happens. i selected them to withstand VCC (20V from USB-C.) normal charge termination? shut off charging. buck converter fails and the output rail sees 20V? shut off charging. >If it’s tied to ground in a single-supply circuit, it will clip any negative voltages i don't want to charge a dead battery since it's unsafe. off-board comparators check for a minimum voltage, like 3.0V for an 18650. a reverse polarity cell would read 0V, as would an absent cell. a dead cell would read <3V. comparators trigger SD LATCH, no current flow can occur because Q1A/Q1B are held off.+

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𓀐 @ybm*WCL-: How does an op-amp work?+

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𓀐 @pfh97eLu: This is what I am being taught in college. It's flat out 2 amps and I have calculated the math all other resistors. Am I retarded?+

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𓀐 @82rMYPJp: It is because you are posting from a phone. Phones assume all their users are retarded, when only most of their users are retarded. Post from a PC. You know, like the one you are taking the picture of? You can screenshot whatever you want using Windows Key + Shift + S. If that is too hard, and you use Google Photos, you can access your phones on the web by going to photos.google.com. You can then download them and use an image viewer like IrfanView to make sure they are rotated properly before posting them here. If you are on an iPhone, well, just ignore everything I just said and deal with the fact that your pictures are sometimes rotated.+

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𓀐 @FX_KXvwD: How to prove you are a Zoomer without outright saying you are a Zoomer. You can change the file format of the image. Use JPG instead of PNG. It takes up much less space. Also, don't take a full screen capture. Use 'snipping area' to only capture the part of the screen you need.+ 1

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𓀐 @MTDxHguL: >Be GenX >Be completely forgotten Also first half of GenZ is millennial-Lite and better with computers than actual millennials (I use Debian btw). t. 28 y/o comp-sci Zoomer+

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𓀐 @euScADba: They don't seem to make pcb-mountable SSRs at the current rating I need (5-6A) plus they're kinda pricey anyway. So I'm thinking of implementing it myself. Is it just an opto and a triac? Just wire the micro into a zero-crossing opto then wire that up to the triac? Do I need to care about zero-crossing on the micro, maybe to align the control signal it emits?+

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𓀐 @AAxzqr=J: What's growing up with a phone got to do with anything? When I was a kid, phones came in two types: Rotary and Touch-Tone. When smartphones came out I hated them. I only got one because a new job I got in 2014 required one. I still hate them. Laptops and tablets too. 104 keys, a full sized mouse, and at least two big screens is the only way to do it. Gotta have a sound system too. Headphones are junk. >I wish I was a zoomer lol Are you saying you are were born before Windows 95 released yet don't know how to use a computer? Fuck dude, what have you been doing? Not getting ripped and fucking chicks, that's for sure. You are on 4chan.+ 1

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𓀐 @-WEj_DC~: Based cellphone hater. I’m waiting for an open source hardware dumbphone that’s actually good. Calls, texts, maps, ideally an end-to-end encrypted messaging platform, and maybe an authenticator for 2-factor things. Headphone jack. Can act as a 4G router for your cyberdeck. A week of battery life because it doesn’t do anything in the background, besides polling for messages and calls. Let people write custom executables for it in Fortran. >headphones You should take the chifi IEM pill. When the cables break, you replace just the cables. I recommend the Truthear Gate, though lately I got the Salnotes Zero 2 and it’s been great.+

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𓀐 @r3JVK3U3: I've decided I want to spend more time learning the actual theory/math behind this shit. I have tinkered and got things to work on my breadboard, but I don't like having such a big knowledge gap. For people who know their shit (even on a smaller scale like just small circuit stuff), how did you best learn it?+

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𓀐 @iAo3XT_8: What sensor needs 1kH? Is the output signal really low frequency?+

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𓀐 @xJw=Ft8a: What to do with a dead graphics card+

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𓀐 @jj_DD-z2: are you really supposed to just pray you don't bridge the pins when measuring a laptop charger ic? are there like, one sided probes available?+

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𓀐 @ZBFKa+g_: Pins 4 and 5 have no continuity on my VGA cable. I'd get a new one but I also want some learning experience. Where should I begin.+

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𓀐 @MJbcJGE+: Don't know anything about electrical work but it looks like my first project is going to be replacing outlets. Got almost all the tools I need: screwdriver (obviously), voltage tester, pliers. About to go to Ace and buy a set of wire cutters. Anything in particular I should look for?+

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𓀐 @=7eJny7+: How easy is it to fix a TV? Is it as simple as opening it up and seeing something with a burn mark on it that needs replaced?+

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𓀐 @hUeC2pwR: Im pretty new to pcb design, but ive made some pcbs and know a bit about electrical engineering. recently i have designed an ESC for a brushless motor, especially to be field oriented control capable. This includes an external "smart" gate driver, inline current sensing, and lots of feedback to the mcu. i took great care in choosing the parts, ratings, mcu pins with dma, and so many little things that i really want to have done perfect, but face difficulties making decision about the layout. I looked at a lot of examples but each time i learn about a new phenomenon and how to not deal with it. i have no idea if or how to deal with switching noise, how to wire my analog current sense to not be influenced by the switching noise and many similar examples. i have become stifled and don't know what to do; maybe this project is to ambitious for me, but i really find it interesting.+

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𓀐 @87BkmVYQ: I'm trying to replace a USB-A plug. One of the holes won't clear. It's like there's some kind of jam in there or something. I've tried wick, solder sucker, pushing a solid core wire through, pushing a fine tip iron through. Nothing works. It's actually two holes that were blocked. Only one I managed to push a solid core wire through. The bottom left one remains completely blocked. Nothing is working. Is there anything else I could try?+

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𓀐 @brqVEw5r: anyone ever buy/use one of these """pure copper""" pin heatsinks? are they actually made of copper -- or is it some fake bastard metal that performs worse than copper or aluminum? i'm trying to heat sink ~12 W from a TO-247 package. this https://www.digikey.com/en/products/detail/fischer-elektronik/ICK-S-25-x-25-x-6-5/26281936 would appear to work but there's no way in hell i'm spending $5 each.+

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𓀐 @ZrDYgWrD: >Mims III, Getting Started in Electronics Does a version of this book exist with a font for adults?+

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𓀐 @DUNuUrP*: Look I'm not the smartest when it comes to this stuff but I need some help with building a dummy load rig. I need to test up to 300W per channel for HiFi amplifiers so I'm thinking about what I need to build the circuit. obviously I need the resistors, which I'm looking at getting 2 of these 8 ohm, 300 w resistors. https://www.digikey.com.au/en/products/detail/ohmite/NHS100-8R-F/17038359 then from there I'm genuinely not what what I need to do. obviously they need some form of active cooling and like some banana plug terminals and then something to mount them to as well. ive seen some dodgy videos on these but none that look genuinely safe. could I please have some help or if an existing pre made product exists for a couple hundred dollars I'd much rather just buy that but the cheapest I can find is in the thousands. i already have amps to test and an ADC for measuring the output (though its snr is only 109db so I plan to upgrade to something more sensitive soon. ive seen guitar dummy loads that look good but ive since learned theyre not the best because theyre for reactive loads rather than non inductive?+

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𓀐 @xEPoYT4H: How the hell did this happen?+

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𓀐 @+cjgff4i: I think the IEC stuff was for people who didn’t graduate middle school and went into trades early, didn’t take math or logic (and wouldn’t know how to write logical expressions either, and wouldn’t know the standard symbols for and/or/not, never used a spreadsheet or used a high school-level calculator produced in the last 40 years or so) Reminds me of another retarded (and somewhat competing) endeavour: “ladder logic” used for PLC programming. Holy shit that is mind numbing for anyone that graduated high school.+

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𓀐 @T~yhwtUQ: found an interesting technique to increase op amp current source/sink capability. apparently CMOS hex inverters can be forced to operate in their linear region. makes sense, but it's nothing i ever considered before reading this. https://device.report/m/46e0e1c760ee95dd98ed55a2f473aa1f37c4d38c7e190883eb756b02a9ae8198.pdf+

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