[sdiy] tongue stuck to skipole @20v

[Tim Daugard]

From: "Paul Perry" <pfperry at melbpc.org.au>

> It's so easy to use a couple of regulators to get
> +-12 from +-15 !

Actually finding regulators that work with only a 3 volt headroom is not that easy. High
current low dropout regulators aren't all that cheap or easy to find. I was going to run
15V off an 18V source and had to switch to 12 volts. Current draw was to great for the 15V
Reulator to work well. LDO regulators may work, but most of the common ones are 3V.


> that's what I'd do.
> Even easier, a couple of 3v zeners, one  in each
> power line.

I agree !! This is an easier fix.

> With old gear I'd be worried about tantalum filter caps
> being on the edge of destruction as well.....

And 12V or 25V between both rails +/- electrolytics.

Tim Daugard
AG4GZ 30.4078N 86.6227W Alt: 12 feet above MSL
http://home.sprintmail.com/~daugard/synth.htm
http://home.earthlink.net/~synthfred/h_toctop.htm (Fred's online edition)