Re: Piezo element
If you make an oscillator, or make a signal with software on a microprocessor and feed it to a piezo transducer, you run into the problem of making sure the drive frequency is on the resonance of the transducer for best output.
Using the transducer's resonance to control the frequency is an elegant way round this problem. All you need is an amplifier the small sense electrode drives the amplifier and the amplifier drives the big electrode. It goes unstable and ocillates bang on its own ideal frequency.
David
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Can't afford the volcanic island yet, but the plans for my monorail and the goons' uniforms are done
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