[time-nuts] Low noise voltage regulators

Brooke Clarke brooke at pacific.net
Wed Feb 24 22:06:35 UTC 2010


Hi neville:

My old Gibbs rack mount 5 MHz standard used the LM723 linear regulator.  
I believe it's one of the lowest noise regulators you can use.
http://www.national.com/mpf/LM/LM723.html#Overview

Have Fun,

Brooke Clarke
http://www.PRC68.com


Neville Michie wrote:
> Hi,
> I remember a reference, probably by Bruce, that LEDS provide a low 
> noise voltage reference.
> I am proposing to build a voltage regulator for a thermally controlled 
> LPRO rubidium oscillator,
> with the voltage regulator being mounted on the 0.5 inch thick 
> aluminium heat sink plate.
> The LEDS would also be mounted on the plate, which has controlled 
> temperature.
> The LPRO has internal voltage regulation, and by running it at ~40C 
> and 18Volts, the thermal
> flux within the unit is minimised as is the power demand.
> What I want to know is if a LM317 running on a stack of LEDs driven by 
> the LM317 output
> would provide a low noise power source? What would be better?
>
> cheers, Neville Michie
>
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