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Tuning fork oscillator, any ideas?

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kcin

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Dear all,
I'm a visual artist (never studied electronics but can read a circuit diagram and do build stuff) and I work also lot with sound. I'm making a work that uses 2 tuning forks with mirrors on the tines. As the forks vibrate a laser beam reflects off the mirrors and projects lisajous patterns. I have been having problems driving the forks in a reliable way. I used a simple buzzer type circuit before but the contacts burn out over time, then I came across the idea of doing it with 2 coils: a drive and pick up type arrangement using a driver and an amp so the electronics put the forks into self-oscillation. I'm struggling to find an overall solution and a simple circuit that will do this and would welcome any suggestions. The forks are about 20cm tall.

Thanks in advance for any advice.
Best Nick
 

Electromagnetic drive and sense has the advantage of contactless operation (with a ferromagnetic steel tuning fork).
The drive and sense coil both need a DC bias current or a biasing permanent magnet for correct operation.
 

electronically turning fork can get by uc.
 

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