[time-nuts] Microphonic Inductor?
Joseph M Gwinn
gwinn at raytheon.com
Tue Apr 13 13:31:57 EDT 2010
time-nuts-bounces at febo.com wrote on 04/13/2010 12:49:05 PM:
> SAIDJACK at aol.com
> time-nuts at febo.com
> 04/13/2010 12:54 PM
> Re: [time-nuts] Microphonic Inductor?
> Sent by:
> time-nuts-bounces at febo.com
> 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
> 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.
> In a message dated 4/13/2010 06:34:53 Pacific Daylight Time,
> wpxs472 at gmail.com writes:
> I assume you are using something like the Coilcraft 0603 LS series
> seem to have ferrite cores. You might want to try a 0805 size part
> 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
> 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
> 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.
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