Doepfer

For all these modifications VCAs are requried. One VCA for the CV control of
the feedback path and two opposite controlled VCAs for the LP/HP panning
(nothing but the A-134 with the two inputs wired to the LP and HP outputs).
One cannot simply add a voltage somewhere in the circuit to obtain CV
control.

If your module consume 165...350mA something is completely wrong! Usually
the A-124 takes less than 30mA.

Best wishes
Dieter Doepfer


> -----Ursprüngliche Nachricht-----
> Von: Doepfer_a100@yahoogroups.com
> [mailto:Doepfer_a100@yahoogroups.com]Im Auftrag von ctujoao
> Gesendet: Donnerstag, 14. Februar 2013 23:40
> An: Doepfer_a100@yahoogroups.com
> Betreff: [Doepfer_a100] A-124 tweak tic tic.
>
>
> Hello there,
>
> Love the A-124. But now, how to make it even better?
>
> I got the self oscillation modifications done. Work best with a
> pot added that let all the screaming goodness slowly coming in.
>
> You can tap the HP or LP on each leg of the mix potentiometer.
> I've personally replace the "cv1" in - never used, always goes
> for cv2 with attenuation- with an "LPout".
>
> One thing that would be nice would be to CV control the
> crossfader between HP/LP, but that sounds like a lot of work, and
> with the extra out mention before, I can do that downstream.
>
> Then, there's the resonance... And how to get control over that
> wild thing.
>
> The signal that flows between the legs of the potentiometer is
> weird; it lives at around 5.8V when the pot is CCW, and at 5.4V
> when CW. However there's significantly more current going through
> (form 165mA to 350mA).
> I've got no idea how that work, could someone point out where to start?
>
> And since I'm not a messiah, but a very naughty boy, I added a
> jack in the signal path at the potentiometer, just to see: when
> an LFO, env...  is added in parallel with the original signal
> flowing through the pot, you can swipe the resonance wildly (full
> res to actually no sound, like silencing the filter, no gain)
> Same thing: if someone wise can explain, I'll be grateful.
>
> THanks.
>
>
>
>
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