FYI, The MPSA18RLRAG is a stock item at Digi-Key, min beta 500 at 1 & 10mA, 45V & 200mA rated, TO-92. $0.33 each.
http://www.digikey.com/product-detail/en/MPSA18RLRAG/MPSA18RLRAGOSCT-ND/1139919 >________________________________ > From: paul swed <[email protected]> >To: Discussion of precise time and frequency measurement <[email protected]> >Sent: Wednesday, July 24, 2013 9:29 PM >Subject: Re: [time-nuts] HP 10811 update > > >Well learned quite a bit Q4 does have an issue. Further there is a reason >it has such high Beta. Its must deliver 30 ma to the oscillator and buffer. >I was quite surprised by this current level. I was guessing the oscillator >was a few mils and the buffer maybe 8. >The 2n3904 simply does not cut it. Need to do some digging in the ole >transistors. >Regards >Paul. > > > _______________________________________________ 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.
