Old message:


Subject:        Low cost knock sensors electronics picture.
   Date:        Wed, 09 Jun 1999 19:20:57 -0700
  From:        Paul <rotaryeng@earthlink.net>
    To:        zz <rotaryeng@earthlink.net>


Here is a picture of the low cost knock sensor prototype.
The dark object in the upper left corner is the knock sensor.

The tiny black chip on the wireing board is the audio
amplifier.

The parts cost less than $10. The earphone is the black 
thing on the right.

You need one of these for each rotor.

Paul Lamar
 
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