[sdiy] EMS VCS3 II negative power supply problems

Mattias Rickardsson mr at analogue.org
Tue Sep 20 22:28:12 CEST 2022

VCS3 is alive and kicking now, I obviously needed to swap the regulating
741 once again.
+12V and -9V come out as +12.2 and -8.8. Haven't tweaked anything yet.

Is there normally a good reason to calibrate all trimpots in these beasts,
or is it safer to leave them be? Well-tuned oscillators have never felt so
unimportant. :-)


Den mån 19 sep. 2022 16:41Mattias Rickardsson <mr at analogue.org> skrev:

> Magnus Danielson <magnus at rubidium.se> skrev:
>> Hej Mattias,
>> It's a classic over-current protection setup. So if there is too much
>> current it will make the driver back off. If this is broken you god that
>> happening you the supply.
> Ok, thanks! Nothing completely unexpected then.
> But... what did your last sentence try to say? :-)
> /mr
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