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

[Stanley Reynolds]

The cheap PC supply may need a load greater than the Thunderbolt to work, as a quick dirty hack I've used a 12V auto signal light on the 5 volt supply.
 
Stanley



----- Original Message ----
From: Didier Juges <didier at cox.net>
To: Discussion of precise time and frequency measurement <time-nuts at febo.com>
Sent: Saturday, June 14, 2008 8:31:22 AM
Subject: Re: [time-nuts] [Fwd: Re: Thunderbolt PS]


> > 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


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