centralized power supply

[Colin Fraser]

>----------
>From: 	Mark Pulver[SMTP:mpulver at midiwall.com]
>Sent: 	07 June 1997 17:15
>To: 	Synthfool at aol.com
>Cc: 	synth-diy at horus.sara.nl
>Subject: 	Re: centralized power supply
>
>
>Synthfool at aol.com (12:05 PM 6/7/97 -0400) wrote:
>
>>>Don't forget voltage, and you also would want at least one AC tap for
>>>Lexicon devices (the LXP-1 & LXP-5 use 9 VAC at *** 1.5 AMPS ***).
>>
>>Not to slam the fine idea of powering AC devices from a master power supply,
>>but I don't recommend it unless you want unbearable hum or broken Lexicons.
>>
>>I actually tried this years ago and it didn't work at all. The AC's for
>>these
>>devices have to be isolated from one another. Sourcing them from the same
>>supply caused me all sorts of problems.
>
>Bummer. 
>
>What if you ran small iso transformers inside the chassis for each of the
>AC feeds? Possibly expensive, but if that's what it takes...
>

I had a similar problem with DC supplies for a TB303 and TR606. They
both need 9v, but can't run from the same supply or share the same 0v
line or else they make awful noises. I had to build a PSU with two
rectifier/regulators on two taps.

Cf