[time-nuts] Replacement A9 boards for the HP 5065A

Poul-Henning Kamp phk at phk.freebsd.dk
Mon Feb 26 18:20:10 EST 2018

In message <CAB+jonC9HVv9826ocWmTdTEC-mr8JJ+G-Vw_teSO4BnMO0B-dg at mail.gmail.com>, Wayne Holder writes:
>>> The only thing I could provok, was that almost all capacitors I
>>> tried were sensitive to touch.
>Most ceramic caps are sensitive to "micro phonics" via the piezoelectric
>effect, which can translate mechanical stress into electrical noise.

Yes, and unlike plastics, their mechanical resonance is sharp and
at frequencies where microphonics matter a lot.

Even then, a 4.7uF SMD multilayer ceramic mounted with two "looped"
wires for stress-relief worked just fine.

Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
phk at FreeBSD.ORG         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe    
Never attribute to malice what can adequately be explained by incompetence.

More information about the time-nuts mailing list