[sdiy] Time for a NEW string - Piezo Switches!!!

[patchell]

    I hesitate to respond because I suspect I am completely wrong about
this....

    I was under impresion that a Peizo device outputs voltage that is
proportional to the "change" in presure, ie, constant presure = no voltage.
The hydraphones I worked with a long time ago were like that at least.

    But if I am correct, you should be able to make a circuit that will set a
flip flop when the button is pushed (ie, the piezo will put out a positive
voltage say), and will reset when released (ie, the piezo will put out a
negative voltage say)....

    But then again, like I said, I could be completely wrong.

Peter Grenader wrote:

> Guys,
>
> I have 10 piezo switches. They are kind of like the ones shown as the site
> backdrop here:
>
> http://www.piezoswitch.com/
>
> But those have tactile feedback - mine are just flat clear annodized
> aluminum.  They are made by Peizo Develpment Inc. Two wires coming out the
> back.  Anyone have a drive circuit for one of these babies?  I just want to
> get a pulse out that stays on as long as the button is down.
>
> Let me know and thanks,
>
> Peter

--
 -Jim
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