[time-nuts] [Fwd: Re: Thunderbolt PS]

[Didier Juges]

> > 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