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Discussion and news about component-level electronic circuits.Electronic systems and circuits
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Unsoldering a power jack leads to non Stop mistakes

Sat, 01/06/2024 - 09:57
Unsoldering a power jack leads to non Stop mistakes

Tried to unsolder a power jack (simple task) soldered new one not properly, tried to fix it and now screwed up. Going to try and clean the copper off and see what I can do.

submitted by /u/irontamoor
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Ramped Solid State Tesla Coil

Sat, 01/06/2024 - 00:04

Hello, first time post here. I wanted to share a ramped SSTC I recently completed. I built several prototypes over the course of 1.5 years. Starting out on protoboard then eventually made around 5 different PCB versions before landing on v7.

A mains synced ramped coil was a bit over my head at the time so I used this project to expand my understanding of electronics. I made a lot of mistakes but that is how you learn! My goal was to make the smallest coil with the longest output. So far I think this might be the most compact coil I have seen with respect to the arc output I achieved.

I made an overview video on YouTube if you would like more details. There is also a link in the video description to HV Forum going over the whole project as well as my schematic.

General Specs:

  • IGBT Half bridge using FGH75T65SHD
  • Secondary Fres is around 350kHz with arc load.
  • Best arc length was 21in, typically arc length is around 16-18in. 9x the secondary coil height!
  • Secondary is only 2n tall! Wound with 44awg wire.
  • Input voltage is 120v from a variac

I linked the video as well as uploaded images. Hopefully everything displays correctly.

For my next project I am making a full bridge ramped DRSSTC for even longer arcs. Eventually I would like to make a QCWDRSSTC as well.

Please let me know if you have any questions, thank you!

edit: this posted showed as being auto removed at first. This is a brand new alt account. All my uploaded pictures are gone though.

submitted by /u/QZW_Labs
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Nice tube clock

Fri, 01/05/2024 - 19:22
Nice tube clock

Made this clock from some old Nixie tubes I found. Not that great with woodworking any recommendations to make it look nicer?

submitted by /u/sdtanna
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This units still alive and kicking

Thu, 01/04/2024 - 13:00
This units still alive and kicking

This decades old hp 6441A Precision power supply at a company I am working for is still alive and within original specification. They use it every day for device calibration purpose. Kind of a first for me to see and use push wheel switch based voltage selector.

submitted by /u/mkomkomkomkomkomko
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Bring Radio Shack Back

Thu, 01/04/2024 - 10:47

For the culture of keeping dying electronics alive .

submitted by /u/37chmbr
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Sound Blaster X-Fi Mod

Thu, 01/04/2024 - 05:36
Sound Blaster X-Fi Mod

Made a few mods that gave it a noticeable improvement in fidelity. Replaced the caps in the signal path between the DAC and Front L/R (green) jack with 50v ELNA caps of slightly higher capacitance. Also replaced the JRC4556 Op-Amp with JRC2114 that has significantly higher slew rate, wider unity gain bandwidth and less noise. Sounds phenomenal using a CICS memory player like CPlay (samples at 32 bit/96kHz rate using the Creative ASIO driver)

submitted by /u/Audio_Precision
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Automatic Card Shuffler Repair

Sun, 12/31/2023 - 22:33
Automatic Card Shuffler Repair

Repaired a slipped gear but am stumped on reassembly of the activating mechanism. I need to connect the Red and Yellow safety pin-looking ends to the Black House-piece so that when re-assembled pushing down on the lever will complete the circuit and activate both motors. Any advice as how to position the springs and the yellow and red switches?

submitted by /u/t-town-tony
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Whoops

Sun, 12/31/2023 - 01:00
Whoops

200 mf at 16vdc. Something went very wrong.

Big bang, lots of smoke but it's working again (not the capacitor!) with a parts bin replacement cap.

submitted by /u/APLJaKaT
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