> > I would like to add an extra question: > > > > How about adding an extra filter after a cheap PC power supply? > > > > 73, > > > > Rainer > > > > > Whilst that may help with the high frequency power supply > noise, it wont help with power supply flicker noise. > > Bruce
Or the lousy regulation and temperature stability, which on a cheap supply may be worse. If the cheap supply can be adjusted to provide 6V instead of 5 and 14V instead of 12, both outputs could be followed by a stable low drop-out voltage regulator (probably discrete rather than an IC) to provide stable and clean 5V and 12V respectively. The -12V only drives the RS-232 chip I believe, so I don't think there is anything to gain with further regulation. If the voltage is too high (as a result of adjusting the other outputs), use a cheap regulator or a zener/resistor. Didier _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
