There's a fairly common problem with linear synthesizer power supplies where the positive regulator fails to start up, leaving you with negative voltage but no positive voltage. I found out the cause of this problem and how to fix it by swapping out one component.
00:00 Intro
00:21 I've been having this problem
01:20 That's the problem
04:21 Positive voltage regulator
04:58 Protection diodes
07:47 Both regulators
09:25 How to fix the problem
13:20 Outro
MFOS Wall Wart Supply: http://musicfromouterspace.com/analogsynth_new/WALLWARTSUPPLY/WALLWARTSUPPLY.php
Frequency Central FC Power: https://frequencycentral.co.uk/product/fc-power/
Texas Instruments Application Note AN-182: https://www.ti.com/lit/pdf/snva517
Blog post: https://analogoutputblog.wordpress.com/2022/06/26/startup-trouble/
Music: Ringtone by Rich Holmes
