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PostPosted: Sun Jul 30, 2017 9:41 am 
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Joined: Fri Oct 21, 2011 12:12 pm
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Location: Delaware
Almost done building my new bench test rig and thought I'd share. I made a few power supply pcb's and paired them with discrete transformers for true isolated outputs. I'm still waiting for my finished faceplate before final assembly. Feature -9V, +9V, +18V, and a 2-30V variable with readout. Also has a signal probe input with a 630V coupling cap. I used all shielded wiring on the signal, so I hope i don't get too much noise, though I'm not too concerned as it's mainly just a test rig.

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I've also made a bipolar supply board. Build docs for all boards linked below. I have a few extra available if anyone is interested.
https://drive.google.com/drive/folders/0B6dSMJZy9h6TblF2TzNwMUxneGc?usp=sharing

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PostPosted: Sun Jul 30, 2017 10:06 am 
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Joined: Tue Jan 02, 2007 1:24 pm
Posts: 16220
Location: Albany, NY
Impressive!! :shock: 8)

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My Website * My Musical Gear * My DIY Pedals: Pg.1 - Pg.2


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PostPosted: Fri Aug 25, 2017 8:17 am 
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Joined: Fri Oct 21, 2011 12:12 pm
Posts: 2888
Location: Delaware
Finally got the vinyl printed and finished everything up. Very happy with the results.

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PCB Docs:
https://drive.google.com/open?id=0B6dSMJZy9h6TblF2TzNwMUxneGc

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If practice makes perfect, and nobody is perfect, then why practice?

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PostPosted: Fri Aug 25, 2017 8:39 am 
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Joined: Tue May 24, 2016 11:16 am
Posts: 104
Nice! See you decided to go with linear rather switching regulator designs. That's good for troubleshooting use because most switchers produce a lot of high frequency hash that makes it harder to see what's going on in a circuit when looking with an oscilloscope (although very clean switching power supplies do exist).

Couldn't tell what kind of rectifiers you decided to use. Fast turn off devices (such as hexfred rectifers) are best for minimizing commutation electrical noise. Snubbers can work well too if properly designed. http://www.hagtech.com/pdf/snubber.pdf


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