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 <[email protected]> To: [email protected] Subject: [time-nuts] Low noise power supplies? Message-ID: <[email protected]> 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 [email protected] 407-982-0446 WWW.LEIKHIM.COM Engineering is the art of making what you want from what you can get at a profit. _______________________________________________ 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.
