Said,
[email protected] wrote on 04/13/2010 12:49:05 PM: > From: > > [email protected] > > To: > > [email protected] > > Date: > > 04/13/2010 12:54 PM > > Subject: > > Re: [time-nuts] Microphonic Inductor? > > Sent by: > > [email protected] > > Hi there, > > I do have space on the PCB, but I am worried that the ceramic > as well as ferrite cores both are sensitive to vibration. > > I will try Joe's idea of using a doorbell buzzer to introduce > vibration. > It's not easy to generate 1KHz vibration without professional > (and heavy) equipment :) > > Another suggestion was to put the part on a scope, and lightly > tap it, to see any variations in voltage. > > It's time to experiment. > > If anyone knows a good inductor-series (leaded or smt) that is > known-insensitive to vibration please let us know! Air wound coil potted in wax. Or soft epoxy. You can make your own, if it comes to that. Joe > Thanks, > Said > > > In a message dated 4/13/2010 06:34:53 Pacific Daylight Time, > [email protected] writes: > > Said, > I assume you are using something like the Coilcraft 0603 LS series which > seem to have ferrite cores. You might want to try a 0805 size part since > that inductance is available in the CS series which are ceramic only. I > don't know if size constraints prohibit using an 0805 but you > can try one > to > see if the inductor is the problem.If you must use a 0603, you might try > massaging the filter impedance so you can use a 390 nH which isavailable > in > 0603 size with a ceramic core. Then, you will either have to > put up with a > mismatch or include some impedance matching components. I use > the LS series > 0603s a lot and they are somewhat temperature sensitive if > that could be an > issue. The ceramic cored CS series don't seem to be > temperature sensitive. > _______________________________________________ > 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. _______________________________________________ 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.
