[time-nuts] Low noise power supplies?
M. Simon
msimon6808 at yahoo.com
Fri Feb 1 09:11:00 EST 2013
Joe,
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.
Simon
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
407-982-0446
WWW.LEIKHIM.COM
Engineering is the art of making what you want from what you can get at a profit.
More information about the time-nuts
mailing list