KS Attenuation, or Dampening

[Ord Millar]

Well,

attenuation reduces amplitude at all frequencies.  Dampening reduces
amplitude according to frequency.

To build a divider:  Connect two resistors in series accross the KS.  Remove
the output wire from the KS, and connect it instead to the junction between
the two resistors.

Keep the resistance value high, like 1Meg each so that you don't load down
the sensor.  The output will be reduced by a facor of R1 / (R1+R2)


-----Original Message-----
From: GARY <hobiegary at earthlink.net>
To: diy_efi at efi332.eng.ohio-state.edu <diy_efi at efi332.eng.ohio-state.edu>
Date: Sunday, May 16, 1999 3:50 PM
Subject: KS Attenuation, or Dampening


>>
>> First of all, isn't the KS a piezo sensor?  If so, I think DC resistance
>> doen't really matter.
>
>Yes Ord, it is but the ECU freaks out if it notices that the KS circuit
>is not present so I assume it is looking for a certain current flow with
>an applied voltage.
>
>If you want to attenuate, you could build a divider
>> around it - two resistors in series accross the element, leave one wire
>> connected to the KS, connect the other to the junction of the resistors.
>>
>> If it is really damping that you want, instead of just attenuation, then
you
>> need to build a low pass filter.
>
>I am unclear on the deference between the two.  Attenuation is reducing
>the signal's amplitude (desired), dampening is reducing the signal's
>magnitude?  What's that?  I don't know what I want!  I want to see of
>the ECU will stop retarding my timing every time the piezo reacts to a
>non-detonation engine noise.
>
>I don't quite follow your description of how to build the divider
>either. Your help is appreciated!
>
>--
>GARY       mailto:hobiegary at earthlink.net
>