[time-nuts] Low noise power supplies?

Charles P. Steinmetz charles_steinmetz at lavabit.com
Thu Jan 31 05:33:30 EST 2013


Lester wrote:

>For a regulated power supply, make one using a 723. The 723 has
>far lower noise out than the monolithic regulators.

If you are willing to design your own regulator using a 723, you may 
as well use a few more parts to get a much better result.  Neither 
the internal reference nor the internal error amp in a 723 is 
anywhere near state of the art today with respect to noise, tempco, 
or speed.  Using readily available buried zener references and 
low-noise, high-speed op amps (or even a few discrete transistors), 
you can do several orders of magnitude better than a 723 in all 
respects.  The web is overflowing with designs (though not all of the 
circuits you find perform as advertised, so evaluate them with a 
critical eye and use your own sound judgment).

But wasn't the original question what is available off-the-shelf?

Best regards,

Charles






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