"Jim Thompson" wrote in
message ...
In a typical piezo (noise maker) transducer, will a series R knock
down the amplitude?

If you're talking about the 2-terminal (externally excited) transducer,
They're largely capacitive and putting a series R will make a low pass
filter. The voltage across the piezo is proportional to the displacement.
This should give a high frequency roll-off according to the RC value.

I've been working with piezo actuators that work in the 0-100V range.
Capacitance is somewhere like 10uF on each piezo.

Oppie