drums and piezo sensors

[Jeremy Brookes]

> I think this is because the
>resonant frequency of the piezo disk inside is about 2 kHz and it takes
>a hard punch on the piezo plastic encapsulation to get sufficient
>energy into this frequency band.

You can get them with different resonant frequencies. In the UK, Maplin 
stock them with frequencies of 1.8kHz, 2.0kHz, 2.8kHz and 4.2kHz (all 
figures are quoted +/- 0.5kHz). Paia had some circuits for interfacing them 
to their drum brain module.

Speaking of which, has anybody built one of these? Is it any use? I was 
wondering whether to build one or just go out and buy a D4 (eventually).

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