[sdiy] Keyboard trigger...

[studio271]

I just thought up this design for a synth keyboard trigger using 
magnetic hall sensor ICs, and I just wanted to know if anyone here 
has ever heard of anyone using them to trigger key strokes.

It uses a momentary tactile switch with a soft-trigger (no 
clicking; or is that what "tactile" means?) to a hall sensor stuck 
below the key and a magnet on the bottom of the key. It works 
where when you aren't pressing the key no voltage is going through 
because of the switch, and once the switch IS activated, it enters 
the (calibrated) hall sensor in a way that sends more voltage 
according to how close the magnet is. You'd probably need only a 
small magnet with a relatively small gauss to give a good 
logarithmic response from the hall sensor.

Please give some input on this subject, and thanks in advance! 
(Got good response on my previous TI predicament, and I'll admit 
that it wasn't that big a deal; I just panicked a little!)

-271 

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