thanks for your advice. You're right: modifying a PC supply could be a long and painful process, far above my available time.
Actually, some better googling revealed abundance of adjustable symmetric PSU schematics, mostly based on LM317/337. Sounds to be a better option if I don't find a genuine ACC120 at reasonable price.
François
To: vintagesynthrepair@yahoogroups.com
From: painintheamp@...
Date: Tue, 23 Dec 2008 02:06:51 +0800
Subject: [vintagesynthrepair] Re:Power supply for Roland M240
Hi...
I wouldnt mess with a modified PC supply.
1st...try some surplus electronics places online.
You can get a little leeway on the volts out (if Roland wants 21.5 , you can supply up to 24vdc most likely as long as the supply can do the +/- 500mA.)
A used one is possible too
The transformer inside will have 24VAC with CenterTap then a full wave rectifier, an LM317 and LM337 adjustable +/-regulators inside. Each set up for the 21.5 Of course they'll be a couple of resistors and filter caps too.(Thats how I'd design one.)
Scott Frye
AudioFixation
Consumer / Pro Audio Repair
Southern VT
"Resistance is futile but.....
Impedance is much more complex"
AudioFixation
Consumer / Pro Audio Repair
Southern VT
"Resistance is futile but.....
Impedance is much more complex"
Scott Frye
AudioFixation
Consumer / Pro Audio Repair
Southern VT
"Resistance is futile but.....
Impedance is much more complex"
AudioFixation
Consumer / Pro Audio Repair
Southern VT
"Resistance is futile but.....
Impedance is much more complex"
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