> So why not use a standard-issue three-terminal adjustable regulator > circuit? Those things don't care what Vin is, only Vin-Vout.
If your Vo is driving a big cap you'll end up with vin = unloaded input voltage and Vo=0V at turn-on. This could exceed max ratings at a bad time which is at max current--charging a big cap. I don't remember how stable your load will be. If it is pretty stable, you could just use a series zener on the high side of your regular regulator. I'm rebuilding some old equipment at the moment that does this to drop +/-24 down to +/-12V on a bunch of chips that have max rails voltages of +/-12V. It's obvious the rails are not all that stable and do exceed the max rating. But this stuff has been working for almost 40 years ... and the chips all rely on supply rejection. Phil > > Duh! > > Thanks for the help, even if you didn't realize what answer you were > really giving. ;) > > -- > Randall > > > _______________________________________________ > geda-user mailing list > [email protected] > http://www.seul.org/cgi-bin/mailman/listinfo/geda-user > _______________________________________________ geda-user mailing list [email protected] http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
