how does a knock sensor work?

[Jared Ryan]

It's a "piezeoelectric" device.  It has a crystal that, when it vibrates,
makes a small voltage.

Piezeoelectric crystals can also work the other way around: apply a voltage
to them and they vibrate.

Pretty neat little suckers.  There's more to the design but that's the heart
of the knock sensor, a piezoelectric crystal.


----- Original Message -----
From: David Gravereaux <davygrvy at pobox.com>
To: <diy_efi at diy-efi.org>
Sent: Saturday, August 25, 2001 2:57 AM
Subject: how does a knock sensor work?


>
> Is it basically a microphone tuned to a certain pitch?  Albeit, a very
> unsensitive one.  Any guides for a newbie to understand these things?  I'd
> better hit the bookstore :)
> --
> David Gravereaux <davygrvy at pobox.com>
>
> $ make war
> make: *** No rule to make target `war'.  Stop.  Try `love' instead.
> --------------------------------------------------------------------------
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