Thanks Charles. I suspect all said the regulated output delivers 1 ma. It doesn't feed much. I have the 2n3904s so cheap test to see if that picks up the 45 Hz
On Wed, Jul 24, 2013 at 3:20 PM, Charles P. Steinmetz < [email protected]> wrote: > Paul wrote: > > Q4 a 2n6429. What interesting about this transistor is its beta at >> 1 ma is 500 min and max is 1300. Its not a darlington. >> > > A BC549C or BC550C should work fine, and they are readily available and > cheap. A 2N3904 should be fine, too, but the current regulator diode on > the zener is only a 1mA part, so the 2N3904's increased base current will > leave a wee bit less for the already-starved zener. Shouldn't be a > problem, though. Noise of the transistor is not a factor (within reason) > -- the zener will dominate that. > > Best regards, > > Charles > > > > > ______________________________**_________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/** > mailman/listinfo/time-nuts<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.
