In article ,
Jamie t wrote:
Pass the signal through a SI diode, a small filter cap on the Cathode
side, and then, pass this signal to the input of a schmitt trigger
inverter, comparator, gate etc....

This will give you a nice square wave for the duration of the
PWM for the ECM to get a proper reading..

If you can't your hands on a schmitt trigger inverter/gate, you could
always use the Trigger and Threshold inputs of a 555 timer. Those will
give you a hysteresis window of 1/3 Vcc supply..

Excellent, thanks. I'll give that a try.

--
*If God dropped acid, would he see people?

Dave Plowman London SW
To e-mail, change noise into sound.