[time-nuts] Low noise power supplies?

[Bruce Griffiths]

Lester Veenstra wrote:
> The typical test supply on a bench for clean VCO testing is a small gel cell
> battery.  For a regulated power supply, make one using a 723. The 723 has
> far lower noise out than the monolithic regulators.
>
>    
Depends on the variety of 723 some are noisier than others.
Some use an internal zener reference, some use a bandgap reference.
The original used a zener reference.

Bruce
> Lester B Veenstra  MØYCM K1YCM W8YCM
> lester at veenstras.com
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> -----Original Message-----
> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
> Behalf Of Richard (Rick) Karlquist
> Sent: Wednesday, January 30, 2013 9:17 PM
> To: Discussion of precise time and frequency measurement
> Subject: [time-nuts] Low noise power supplies?
>
>
> I know this topic has been discussed in the past on the list, but a
> colleague is asking if there are any off the shelf low noise power supplies
> for testing oscillators.  Something a cut above an HP "brick" lab power
> supply etc.  They are hoping to avoid having to homebrew a power
> conditioning circuit.
> Did we ever arrive at a concensus as to the state of the art in homebrew
> power conditioning circuits?
>
> Any help would be appreciated.
>
> Rick Karlquist N6RK
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