/r/electronics
Discussion and news about component-level electronic circuits.
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/r/electronics
I mess around with LEDs a lot. I have a laser engraver and I like to make little battery or USB powered lamps. So I'm forever messing around with batteries, resistors, and different LEDs, usually powered from the USB port on the back of my keyboard. Recently I found myself needing 12V, and I couldn't get it anywhere.
So, I put my thinking cap on. I need a small PSU. First off, it can be battery powered using one of the lithium batteries I have a bunch of. So it'll need a TP4056 in there too. No problem. Then I figured, what if I use one of those step-up boards, with the links for 5V, 9V, 12V, but instead of the links, I wire them to switches? Yeah, that should work. So I was ordering the parts, found a nice little voltmeter to put on there too.
Well the parts arrived today so I got to designing. First off, those links on the step-up board are tiny. 0.5mm pencil for scale. Luckily, one end of the link is 0V so I can pick that up elsewhere. Only need to attach two wires. Still fiddly though. Having decided on a basic layout, I cut the box and did atrial fitting. So far so good.
Got it partially wired up, big blob of hot glue to support those wires, quick test and it works perfectly. Yay! (Ignore the odd display, it's multiplexed and messes with the camera shutter.)
Wired it up for real, stuck a little breadboard on top, and there it is.
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Apparently back in the day people had big pockets 🤣
This is my very first drawing, I will send the this to pcb manufacturer soon. Hope I can get some advices and tips so I won't fry my stuff wasting other components.
Open to anything, including discussions, complaints, and rants.
Sub rules do not apply, so don't bother reporting incivility, off-topic, or spam.
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Forgot to order 0R2 resistors in my BOM. Oh well, time for some good old fashioned botching to save the day.
Spotted this monstrosity in the wild
It has no any practical purpose. However I think it got somewhat fancy so I post it.
So it has adjustable output voltage and overcurrent protection. The goal was to make something with minimal set of basic parts.
Simulation here https://tinyurl.com/ywqfok6x
Would be cool to hear any design suggestions, but again it is just for fun and probably won't be wired
There are a few capacitors to nibble on if you are still hungry:
Vending machine in the basement of Portland State University's engineering building
Open to anything, including discussions, complaints, and rants.
Sub rules do not apply, so don't bother reporting incivility, off-topic, or spam.
Reddit-wide rules do apply.
To see the newest posts, sort the comments by "new" (instead of "best" or "top").
what is your experience with chatgpt when it comes to electronics ?
Saved a NAS ds2415+ a friend given to me for free because did not booting at all. It was the notorious bug of the intel c2000 processor.