[sdiy] Opionions on Switchmode PSUs for analog synths?

Neil Johnson neil.johnson71 at gmail.com
Thu Oct 31 15:03:28 CET 2019


Vladimir Pantelic wrote:
> interesting. The A-110 has an onboard 10V regulator and a TL431 for the
> octave switch.
>
> there is R8 going to "raw" -12V in the CV summer and the expo is driven
> from 12V directly, so maybe its that...

Also consider noise coupling through common impedance in the 0V rail
(which is not actually zero volts).  Yeah, that innocuous wire that
connects to the non-inverting input to all those op-amps.... and is
bouncing around all over the place thanks to (predominantly digital)
modules dumping hundreds of milliAmps of current down it...

Neil



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