[sdiy] Found the Piezo Manufacturer!

[Cynthia Webster]

on 2/5/05 7:37 PM, Scott Stites at scottnoanh at peoplepc.com wrote:

> 
>> OK, found them (the company that makes the switches I'm using).  here's
>> their site:
>> 
>> http://www.piezoswitch.com/
> 
> There must be some mistake - I didn't see 'touchplate keyboard' listed
> anywhere in the recommended usage section =-D.
> 
> I wonder if they are piezoresistive and the two leads are analagous to the
> two leads of a resistor that changes its resistance with pressure.  If so,
> then the current will vary with pressure accordingly, and perhaps the buffer
> Peter mentions converts the current to pressure voltage?
> 
> Other than that wild stab in the dark, beats the hey outta me how they work
> (that didn't take long, did it?).
> 
> Cheers,
> Scott
> 

(They have a passive Mosfet circuit inside the potted epoxy).

Cynthia