[time-nuts] Low noise power supplies?

M. Simon msimon6808 at yahoo.com
Fri Feb 1 09:11:00 EST 2013


I'm using that in my low power (150ma) supplies. I add a zener to the base (darlington) circuit for pre-regulation. Since I'm doing a line operated linear supply the fall off of gain with frequency is not  of too much concern.

Once I finish testing (I have boards in hand - I need to order parts)  I will publish. 


Message: 6
Date: Thu, 31 Jan 2013 15:39:02 -0500
From: Joe Leikhim <jleikhim at leikhim.com>
To: time-nuts at febo.com
Subject: [time-nuts]  Low noise power supplies?
Message-ID: <510AD666.8090908 at leikhim.com>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed

Back when I was in product engineering there was a VCO design that used 
a "superfilter" circuit. It consisted of a pass transistor and a filter 
cap from base to ground. The gain of the transistor multiplied the 
effective capacitance. I have not seen this configuration since.

Joe Leikhim

Leikhim and Associates

Communications Consultants

Oviedo, Florida

JLeikhim at Leikhim.com




Engineering is the art of making what you want from what you can get at a profit.

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