Reddit:Electronics

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

Came in with a trace uplifted and bridge connections.

Leaving fixed and ready to go.

Obviously desoldering a part then removing solder and putting it back is simple. But this part had its legs bent sideways, they were so far bent they were touching without the aid of solder. After several attempts of applying flux, solder wick and of course the iron I decided the only way would be to cut with a razor blade. Thankfully it went smoothly and I was able to successfully remove the remaining solder on the legs.

This is entirely based on this random Redditor trusting me with his $700 laptop fully knowing anything could happen. I’m glad there are people like me and him who still trust in random strangers.

This laptop will be sent back by Monday morning and will live a long 2nd life with u/KaleAdditional776 Glad I could help man!!!!

As a child I played with these dialers and thought the DTMF sounds were interesting so bought this gem as a throwback

Kind of got bored so cobbled this together in around 3 hours without really planning it out. The fans are 24V iPPC fans so went overkill with the LDO for the pi (when I tested it on a breadboard I didn't use a heatsink and the LDO sent 24v into the pi after around 2 weeks of use)

I still need to figure out what features I want (there's a pushbutton and a pot which I originally planned on controlling 2 separate PWM channels with) but since the RP2040 is relatively capable I might add more features with double clicking etc.

what is your experience with chatgpt when it comes to electronics ?

\"me: show me diagram of multivibrator\"

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.

I’ve tinkered a bit with soldering here and there but haven’t done anything proper other than like a blinking LED circuit.

Funnily enough, this pedal works by modulating the blinking of an LED light, and only allowing signal to pass through when it’s on.

Well, assuming I get any signal at all once I’m done 🙈

Industrial maintenance sparkie by trade and have never soldered anything smaller then 8SOIC pins. My personal laptop started to stop charging unless the port was bent to the perfect position and I figured I might as well give replacing the USB C connector a shot and try and save myself 3 grand. Surprised it actually worked.

I’ve been working on this amp for a while now. Every foil 0.05 mf total of 8 were bad. Replaced with sprague orange drops.

Can cap C1 a 40/40 mf 350vdc was also bad. Replaced with a 50/50 mf 500vdc.

Can cap C2 20/20/150 mf 350/350/50 vdc was shot replace with a 150mf 250vdc. I haven’t replaced the 2 20 mf sections yet. I don’t have the right caps. They are bad Tom reading 39-33 mf.

Replaced volume pot and re wired leads to it.

All tubes are excellent all 12AX7s from the same 10 pack ge box form 76. 6v6gts all Ken rad black glass. Rectifier 6CA4 is used but strong. All tested for shorts / gas / micromhos with my TV-7 completed with all accessories and documentation. Fully restored.

Have spent hours cleaning it.

Currently, the replacement of the caps has fix a ton of issues. Distortion/Phase issues between channels.

The only issue right now is the left and right Channels are not balanced when pot is in the center and volume is at 50%. The left channel is about 33% higher than the right, turning the balance knob from 12 o’clock to 2-3 o’clock lines both channels up smack dab on top of each other. I was thinking it was an issue when I rewired the pots. However, I can’t rule that out until I replace the can cap with the 2 20 mf 350vdc.

I was developing a ups system that can provide power backup to my router and the pihole. It was in its second iteration, I soldering the jack in with reversed polarity and tried powering my dlink router and killed it.

Typical reverse polarity will kill most of boards, but this one only killed the input switching regulator and spared rest of circuitry. The regulator was an unknown sot23-6 package. I initially didn't know what this regulator output was. The power output was branching to two sections on board. One section was powered by a second regulator, but the other section is directly powering rtl8211. Fetched the datasheet of rtl8211 and found it works on 3.3V. I then soldered a buck converter module in place of burnt input regulator and set it 3.3V and powered the router again and et voila! The routers alive. The router ups system works well with very fast switching between battery and primary power.