09-28-2016, 09:25 PM
This subject has come up more than once. I posted a very good circuit by Peter G. Balazsy (pbpix on the other forum) here:
http://philcoradio.com/phorum/showthread...y#pid13406
http://philcoradio.com/phorum/showthread...y#pid13406
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Ron Ramirez
Ferdinand IN