On 7/13/22 8:48 AM, Lester Veenstra wrote: > Do not forget the venerable 723 for a very low noise, low power. regulation. > > Lester B Veenstra K1YCM MØYCM W8YCM 6Y6Y > lester@veenstras.com > > 452 Stable Ln (HC84 RFD USPS Mail) 723 is around 2 uV noise..not bad, but the PSRR isn't nearly as good as the LT304X series.  And the max input voltage is higher on the 723 (although you have to watch the dissipation)

Thanks; That’s what I get for not keeping up with the state of the art. Never the less, for the price (a lot less than the 5-6$ for the good stuff, it remains a viable part. True not LDO, and as I said, not for high power. Way better than the 78xx-79xx utility solution. Back in my days of PLL work, my bench was a battery, a 723, or a 78xx. The 78xx dominated noise, but with the Specans of the time, not much practical difference between a battery and a 723. However, today, in the "nut " environment, I grant the part can be retired. Lester B Veenstra K1YCM MØYCM W8YCM 6Y6Y lester@veenstras.com 452 Stable Ln (HC84 RFD USPS Mail) Keyser WV 26726 GPS: 39.336826 N 78.982287 W (Google) GPS: 39.33682 N 78.9823741 W (GPSDO) Telephones: Home: +1-304-289-6057 US cell +1-304-790-9192 Jamaica cell: +1-876-456-8898 -----Original Message----- From: Lux, Jim [mailto:jim@luxfamily.com] Sent: Wednesday, July 13, 2022 2:18 PM To: Lester Veenstra; 'Discussion of precise time and frequency measurement' Subject: Re: [time-nuts] Re: DIY Low offset Phase Noise Analyzer On 7/13/22 8:48 AM, Lester Veenstra wrote: > Do not forget the venerable 723 for a very low noise, low power. regulation. > > Lester B Veenstra K1YCM MØYCM W8YCM 6Y6Y > lester@veenstras.com > > 452 Stable Ln (HC84 RFD USPS Mail) 723 is around 2 uV noise..not bad, but the PSRR isn't nearly as good as the LT304X series. And the max input voltage is higher on the 723 (although you have to watch the dissipation)