keyboard contact rubber fun

[Jim Patchell]

Tim Ressel wrote:

> Interesting...
>
> There are lots of ways to rig a magnetic sensor. I'm sure a simple and easy one
> exists.
>
>
> No, a iron plunger gives a signal proportional to the velocity of the plunger.

    What I had in mind here was more akin to having the plunger change the
reactance of the inductor.  If you apply an ac current of a fixed frequency to the
circuit, and you move the plunger into the inductor, the reactance will change, so
you will end up getting a voltage proportional to the position of the plunger.

    -Jim