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Designing a synth bipolar PSU inspired by Doepfer's A-100 PSU3 (i.imgur.com)

submitted 11 months ago by wfh@lemm.ee to c/askelectronics@discuss.tchncs.de

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I'm planning to make a modular synth from scratch, but I need to start with the PSU. Do you see any issues with this schematic?

The main difference between this design and traditional linear PSUs is the replacement of the transformer/rectifier/filter circuit by Mean Well IRM AC/DC converters. The linear regulation circuit is basically the reference design for the 78xx/79xx.

Do you think there would be an issue once scaled? The AC/DC converters have a lot of headroom, as I plan to make up to 3 regulation circuits like so:

full schematics

(the regulated outputs will actually never go nowhere near 1A per rail)

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[–] linker3000@discuss.tchncs.de 1 points 11 months ago (1 children)

Replacing the linear elements with switchers means more noise in the power lines. How much more, and whether it's noticeable or tolerable will be down to you.

[–] wfh@lemm.ee 1 points 11 months ago

The linear regulators are still there. It's the rectifier that gets replaced. I guess the main difference in the power side is the high frequency noise of the switching PSUs vs the low frequency ripple of the rectifier, I'm not 100% sure if 7x12s are immune to them at least at audio frequencies.