[sdiy] Power supply

[Christopher Mullin]

I have a A Sys Doepfer hybrid running in a A Sys case.  I've just made a 
small pre-amp project from Maplin (Velleman Universal mono pre-amp) which I 
thought might be compatible with my synth (input from 10-30VDC drawing 10mA) 
I powered it up - and read the output.  This was no more than 4V, so I 
thought it would be well within the limits of the synth.  As soon as I 
plugged it into the synth I blew a fuze.  I reckon I've wired up the power 
wrong so I'd appreciate some advice.

  The two power inputs are labelled + and -.  It specifies 10-30V, so I 
wired the -12V from the synth to the - peg, and the Ground from the synth to 
the + peg, giving a potential of 12V overall.

Can anyone suggest the correct wiring for this as I've run out of fuzes.

Stuadh

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