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

submitted 9 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 9 months ago

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 9 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.

this post was submitted on 06 Dec 2023

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