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

Michael E Caloroso mec.forumreader at gmail.com
Thu Apr 28 04:29:42 CEST 2016


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

I have owned a Source since 1985 which uses the same "substrate oven"
circuit as the Prodigy.  It works very well.

MC

On 4/27/16, Nils Pipenbrinck <n.pipenbrinck at hilbert-space.de> wrote:
> 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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