Doepfer

I took a look at the old A-126 documentation. The additional parts have been
added to stabilize the internal voltages (+9V, -9V). You will find probably
two electrolytic capacitors (one soldered between GND and +9V, another
between GND and -9V) and a Schottky diode (soldered between GND and +9V to
prevent from the so-called latch-up effect). And there may be an additional
Z-diode (5V1 or 5V6) that limits the control voltage for the CEM3382 to
about 5V, and a 1nF capacitor that prevents high frequency noise in the
quadrature VCO circuit.

Best wishes
Dieter Doepfer



> -----Ursprüngliche Nachricht-----
> Von: Doepfer_a100@yahoogroups.com [mailto:Doepfer_a100@yahoogroups.com]
> Gesendet: Samstag, 23. Februar 2019 10:17
> An: Doepfer_a100@yahoogroups.com
> Betreff: [Doepfer_a100] Re: A-126 Malfunction
>
>
>
>
> > Does yours also have some parts on the solder side?
>
>
> 4 parts are soldered at the back.