[sdiy] DIY PSU

[Dave Kendall]

Hi All.

Probably way out of my depth here, but looking for a way not to have to
spend a fortune on nice power-one PSUs for the modular........

I recently got given a nice looking transformer (N.O.S from RS) It has
120V/240V inputs, and AC output taps at 0V, 4.5, 9, 12, 15, 18, 20 and 24V.
It says it can deliver up to 10A from any one tap.
A friend suggested that if these taps are RMS measurements, then it should
be possible to take 0V, 12V and 24V, use the 12V as ground, and rectify and
regulate the other outputs down to +15V and -15V, as the peak voltages would
be more like around + or -20V or so.

The other suggestion was to run rectified DC at ±20 ish (whatever it works
out to after diode drops) and use local voltage regulation at the modular
distro boards and inside the rack synth(s) that are planned - that way lower
current regulators could be used. I guess they'd have to be pretty accurate
for driving VCOs though.

Is any of this at all feasible? I haven't yet found any schemos or circuits
that are relevant, except possibly the LM723 datasheet, so if anyone knows
any sites?.....

Any comments would be welcome (even if they are "don't do it!")

cheers,

Dave