[sdiy] "Substrate Oven" in VCO and VCF again

Nils Pipenbrinck n.pipenbrinck at hilbert-space.de
Thu Apr 28 02:24:11 CEST 2016


On 04/28/2016 01:23 AM, Nils Pipenbrinck wrote:

> And then there is Moog Prodigy:
> http://www.emusic-diy.org/MoogManuals/Prodigy?action=AttachFile&do=get&target=prod9.gif
 >
> I haven't estimated the power dissipation or collector current (will do
> so later), but the way Moog connects the substrate would violate the
> maximum collector to substrate voltage (24 instead of 20V).

Short correction: I was wrong. The substrate is connected to about -1V, 
so everything is fine in this regard.

It also dissipates 300mW peak at about 24mA collector current with a 
nice linear power dissipation ramp between the opamp output voltages 
-10V to -8V.

 From all heater schematics that I've seen so far the Prodigy seems to 
be the most solid.

Nils



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