Hi Even things like 1N4001’s can be used as varicap diodes ….
Bob > On Mar 14, 2020, at 4:08 AM, Andre <[email protected]> wrote: > > Hi, what about using an SDR to micro adjust the 19.2 MHz crystal? > > I found that replacing the input capacitor (normally 18-27pF) with a reversed > blue SMD LED seems to help. > Simply pick an LED with the desired reverse capacitance and test. > Also feasible: add a 10pF C0G as well if the frequency is too far off to trim > in this way. > https://www.newark.com/capacitor-types-and-performance > > Note that most blue LEDs are light sensitive to UV so plan accordingly. > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
