Hi Hal and other responders, I believe that the OCXO uses an ON-OFF type of regulation. So, no, it doesn't use 1A all the time. Maybe I should just put an ammeter in the line and see what kind of duty cycle it has after it's at temperature.
I tried a 7812 regulator with a small dissipator on it. It goes into overheat mode almost immediately and the output voltage starts quickly doing down. The case does have provisions for a single TO-3 transistor conducting heat to the back of the case with no radiating fins. I had briefly considered using a zener and a 2N3055. I think that instead of worrying this to death, I'm just going to use a brick to get it together, and then if something comes up later that I like, I'll put that in. I did like the looks of that PT5102 but it's at end of life, and 1A is right at it's limit. I've given some consideration to seeing whether I can pull a few turns off the transformer secondary, as well. Bob - AE6RV ----- Original Message ----- > From: Hal Murray <hmur...@megapathdsl.net> > To: Bob Stewart <b...@evoria.net>; Discussion of precise time and frequency > measurement <time-nuts@febo.com> > Cc: hmur...@megapathdsl.net > Sent: Thursday, June 27, 2013 2:24 PM > Subject: Re: [time-nuts] +12 Volts 1A (plus a bit) supply? > > > b...@evoria.net said: >> The transformer gives me about 20 volts DC out. Dropping 8 volts at 1 amp >> is just a lot of power to void with a resistor. I'd like to avoid > having >> that much waste heat in the unit. > > Does it really take 1A after it's warmed up? _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.