[sdiy] Power supply

[Tim Parkhurst]

> -----Original Message-----
> From: Christopher Mullin [mailto:stuadh at hotmail.com]
> Sent: Tuesday, September 28, 2004 2:15 PM
> To: synth-diy at dropmix.xs4all.nl
> Subject: [sdiy] Power supply
> 
> 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
> 

Whoops! You definitely DON'T want Ground connected to the +V input. +12 on
the synth goes to +V on the pre-amp. As far as the -V input, this should be
-12, but then where is the Ground connection? Is there another input on the
pre-amp labeled as Ground? 


Tim (blown a few fuses in my time too) Servo

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