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.
