At 2:28 PM +0000 11/24/11, time-nuts-requ...@febo.com wrote:
Message: 3
Date: Thu, 24 Nov 2011 13:22:38 +0100
From: Attila Kinali <att...@kinali.ch>
To: Discussion of precise time and frequency measurement
<time-nuts@febo.com>
Subject: Re: [time-nuts] Low noise power supplies for time nuts
circuitry
Message-ID: <20111124132238.0c810b78.att...@kinali.ch>
Content-Type: text/plain; charset=US-ASCII
On Wed, 23 Nov 2011 04:50:49 -0800
Chuck Forsberg WA7KGX N2469R <c...@omen.com> wrote:
How well would a pair of cascaded 3 terminal regulators do - say a 7815
feeding a 7812.
78xx Regulators are quite noisy. You can use them to filter the
noise of a cheap DC/DC converter, but i wouldnt use them feed
high precision electronics. There are a lot better designs these days.
What I see done in low-noise circuits is a low-noise opamp used as a
linear voltage regulator to clean up the output of a 78xx or the like
regulator.
Joe Gwinn
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