Desensitizing GM knock sensors

[Roger Heflin]

On Fri, 18 Feb 2000, Dave Plummer wrote:

> I had read somewhere that the knock sensor doesn't care so much about
> amplitude (volume) as frequency.  Therefore, putting a resistor inline that
> just reduces the amplitude of the circuit wouldn't seem to me to accompish
> much...
> 

It cares about amplitiude at that frequency.  Lots of amplitude not at
the frequency it should ignore, but you put the resistor setup in and
the lowers the amplitide at all frequencies below the amount of energy
at the given frequency it is looking for.

			Roger

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