Hi If it’s used in a grounded base configuration, it does indeed matter …..
Bob > On Jun 25, 2018, at 6:39 PM, Dana Whitlow <[email protected]> wrote: > > John speaks of high dissipation, which is a good point. However, I doubt > that the > lead inductance will be a noticeable factor at 10 MHz unless a leaded part > is > mounted sloppily. > > Dana > > > On Mon, Jun 25, 2018 at 4:04 PM, Bob kb8tq <[email protected]> wrote: > >> Hi >> >> The PZT version actually has a higher power dissipation than the leaded >> part. It >> also does a bit better at RF frequencies due to lower lead inductances. >> Not having >> the schematic in front of me, I don’t know if either one is a real big >> deal in this case. >> It has been on other circuits I’ve used them in. >> >> Bob >> >>> On Jun 25, 2018, at 4:56 PM, Dana Whitlow <[email protected]> wrote: >>> >>> John, >>> >>> Couldn't the TO-92 part (2N3904) be soldered down instead (if one has >>> steady hands), >>> and work about as well? >>> >>> Dana >>> >>> >>> On Mon, Jun 25, 2018 at 11:58 AM, John Ackermann N8UR <[email protected]> >> wrote: >>> >>>> To those who pre-ordered TNS-BUF boards: >>>> >>>> We've had a delay due to parts availability -- a common transistor >>>> (PZT3904) is apparently on worldwide back order with lead times quoted >> of >>>> up to a year. Our contract manufacturer has finally found a source, but >>>> they will not be delivered until mid-August. That means that TAPR won't >>>> receive the boards until the second half of September. >>>> >>>> If the delay causes you a problem and you'd like to cancel your order, >>>> please contact the TAPR office ([email protected]) and John will take >>>> care of that (though he will be out of town until July 6). >>>> >>>> Sorry for the inconvenience, but we did not want to risk using a >>>> substitute component that might change the performance of the unit. >>>> >>>> John >>>> _______________________________________________ >>>> time-nuts mailing list -- [email protected] >>>> To unsubscribe, go to https://lists.febo.com/cgi-bin >>>> /mailman/listinfo/time-nuts >>>> and follow the instructions there. >>>> >>> _______________________________________________ >>> time-nuts mailing list -- [email protected] >>> To unsubscribe, go to https://lists.febo.com/cgi- >> bin/mailman/listinfo/time-nuts >>> and follow the instructions there. >> >> _______________________________________________ >> time-nuts mailing list -- [email protected] >> To unsubscribe, go to https://lists.febo.com/cgi- >> bin/mailman/listinfo/time-nuts >> and follow the instructions there. >> > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > https://lists.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://lists.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
