> How about using a Wien bridge or something to generate the wave?
> Alternatively, what about a PWM of some sort? Would just strobing a pulse
> through the coil at regular intervals be enough to cause a vibration? In
> that
> case you could just use a simple RC circuit or something.
> - Marcel
>


Thanks for the comments! Since there's going to be a PIC in the product to
handle other stuff, I'm planning on having it drive a transistor or two to
drive the pump. The trick is, should I:

1. Rewind the pump using a center tapped coil and pulse each end of the
coil to ground, or

2. Rewind the pump with a single ended coil and pulse just one end to
ground (mechanical resonance possibly would take it back the other way).

3. Don't rewind the pump, but make the coil resonant so I can get enough
current with low voltage drive (as mentioned in the article I posted
previously in this thread).

Again, THANKS for the comments!

Harold


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