The C. S. Stong 'Amateur Scientist' anthology included a 110V 60 Hz telescope-tracking drive generator project that used a reversed filament transformer. It was a bleeding-edge design for the time, using a CK722 Wien bridge oscillator (complete with HP-style pilot lamp AGC) and a couple of early germanium power transistors. The author found that he had to rewind the transformer to cut down on saturation loss, but he was otherwise able to get it to work OK with the crude solid state technology available at the time.
The author didn't say as much, but I wonder if transformers sold as 'filament' transformers were designed to saturate intentionally, to limit the inrush current they would otherwise apply to cold heaters. I would expect modern transformers to work better, just because their manufacturers are more concerned with minimizing losses than they were back in the day. -- john, KE5FX > -----Original Message----- > From: [email protected] [mailto:time-nuts- > [email protected]] On Behalf Of Neville Michie > Sent: Saturday, June 25, 2011 5:03 PM > To: Discussion of precise time and frequency measurement > Subject: Re: [time-nuts] No more 60Hz, How do I discipline 120VAC 60Hz > from a UPS > > > An interesting question about making a 50/60 hertz source, > Does a 120 to 12 volt transformer have enough inductance to use as a > 12 to 120 volt transformer? > Remember, the inductance is proportional to the square of the no of > turns, where as voltage is proportional. > cheers, > Neville Michie > > _______________________________________________ > 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. _______________________________________________ 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.
