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Isolated pedal power build
Posted: Tue Sep 03, 2024 11:51 am
by laurie
Over in this thread I was looking for a Weber transformer:
viewtopic.php?f=5&t=930
I decided to go with low-profile PCB mount transformers so I can get the whole thing into "flat" case that will mount under the pedalboard. It will be eight fully isolated outputs each with 200mA continuous capability.
This is the transformer PCB and one of the eight regulator boards.
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Re: Isolated pedal power build
Posted: Wed Sep 04, 2024 12:14 pm
by laurie
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Re: Isolated pedal power build
Posted: Mon Sep 09, 2024 2:55 am
by laurie
Build continues.
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Re: Isolated pedal power build
Posted: Mon Sep 09, 2024 2:57 am
by laurie
The Triad transformers have dual 120V primaries, and I laid out the transformer board so that the power supply can be converted from 120V to 240V later (jumpers on the back-side of the board.
Re: Isolated pedal power build
Posted: Mon Sep 09, 2024 5:40 am
by Pepe
Very neat!
Re: Isolated pedal power build
Posted: Sat Sep 14, 2024 2:29 pm
by laurie
Slowly managed to finish it - I didn't really have the spare time, but wanted to get it off the bench
It is 100%, completely noiseless. All pedals engaged and there is no hum in the amp.
It is linear, so there is heat. A couple of small (25mm) fans keep it cool.
The fans take 100mA total, powered by one of the outputs. So there are 7x200mA and 1x100mA outputs.
It does get warm. If using in a hot environment, it would need to be derated to 100mA and 50mA, but it is OK here in Canada. If I was building another one it would be four 300mA outputs, or I'd use bigger transformers and a bigger enclosure.
It took about 20 hours to design and build, so not a "commercial proposition"
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Re: Isolated pedal power build
Posted: Sat Sep 14, 2024 2:30 pm
by laurie
- 8outPSU3.jpg (170.93 KiB) Viewed 18233 times
Re: Isolated pedal power build
Posted: Sat Sep 14, 2024 5:12 pm
by bigtone23
Very cool!
Re: Isolated pedal power build
Posted: Sat Sep 14, 2024 8:39 pm
by Pepe
Nice! I wonder if some extra IC heat sinks and heat transfer paste could reduce the heat build-up in the chassis.
Re: Isolated pedal power build
Posted: Sat Sep 14, 2024 10:57 pm
by laurie
Pepe wrote: ↑Sat Sep 14, 2024 8:39 pm
Nice! I wonder if some extra IC heat sinks and heat transfer paste could reduce the heat build-up in the chassis.
The regulators are bolted to the chassis. The heat rise from them is OK. It is the little transformers - they run hot.