[time-nuts] Replacement A9 boards for the HP 5065A
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
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Never attribute to malice what can adequately be explained by incompetence.
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