Doepfer

Hi Keld,

> Yesterday I was trying an Allen Strange patch on my A100 modular. I 
> connected two different A110 VCOs (one pulse wave (actually square) 
> one sawtooth) to a A180 multiple and connected the A180 to my 
mixing 
> desk. (non linear mixing according to Allen Strange). When I 
> disconnected the A110s from the multiple - every time i took my 
> hands off the keys - it sounded like the voltage dropped to 0 
volts. 
> The misbehaviur of the VCOs dissapeared and the VCO were back to 
> normal just as quickly as i appeared - after a few minutes. Was it 
> the VCOs short circuit protection "kicking in" ?
> Hope you all understand my description of the problem. :o)

The only short circuit protection that I can see is a few 
strategically placed resistors to limit current. Without actually 
trying it, I would say that the square output should be back to 
normal immediately after removing the short; the only thing I can see 
in the sawtooth output that might cause some 'delayed' behaviour is a 
capacitor to remove the DC from the saw coming off the the oscillator 
core itself - it's possible perhaps, depending on the relative 
frequencies of both signals and how wide/narrow your pulse was, that 
this may have to adjust its charge level after removing the short, 
but I would expect seconds rather than minutes before returning to 
normal. Perhaps if your mixer has a very high input impedance that 
may have prolonged it, and also what ever it is exactly that you are 
expecting to happen when you 'took my hands off the keys', since you 
don't say what else is in the patch, specifically driving the VCOs? 
Doesn't look like any harm should come from doing this though (but I 
accept no responsibility if anyone does trash an A-110 whilst 
attempting it...)

Tim