[sdiy] Linear PSU Power Sequencing Issue

ackolonges fds ackolonges at hotmail.com
Thu Oct 31 07:03:08 CET 2019

Hi Mike,

Thanks a lot for your reply. I did try that, and found that removing modules did sometimes make the problem go away, but it didn't matter which modules were removed. For example, say 5 modules were plugged in. Removing any of the 5, leaving 4 left, may make the problem go away, but it didn't matter which one was removed. The supply is perfectly capable of powering all 5 however, because a quick flick off-on of the power switch provides power without issue.


From: Synth-diy <synth-diy-bounces at synth-diy.org> on behalf of Mike Beauchamp <list at mikebeauchamp.com>
Sent: Thursday, October 31, 2019 6:31 PM
To: synth-diy at synth-diy.org <synth-diy at synth-diy.org>
Subject: Re: [sdiy] Linear PSU Power Sequencing Issue

> The issue is that sometimes when I power up a unit with modules plugged
> in, the +12V rail does not power up properly (the indicator LED does not
> light), but if I switch the power off for a short time and back on
> before the caps have discharged, the +12V rails powers up fine.

Maybe disconnect one module only at a time (leaving all the others
connected) and power it up to see if one of the modules is causing the


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