Hi Most inductors are vibration sensitive from the windings moving relative to the core. If the part in question has windings you can get at - try gluing them down. Anything with some mass to it will do fine (RTV, hot melt glue, wax, what ever). The value will change, but if the vibe problem goes away you have useful data.
Bob -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of [email protected] Sent: Tuesday, April 13, 2010 12:49 PM To: [email protected] Subject: Re: [time-nuts] Microphonic Inductor? 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! 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 is available 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.
