Hi To answer the original question - Power Design makes some pretty quiet bench supplies. If you are doing low noise testing, batteries often will let you get rid of one more ground loop. Even well built power supplies are not as well line isolated as a battery.
Bob -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Charles P. Steinmetz Sent: Thursday, January 31, 2013 5:33 AM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Low noise power supplies? 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 _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
