Modifing O2 output

Peter Orban ORBAN at NRCAMT.IAMT.NRC.CA
Wed Sep 27 17:22:33 GMT 1995


> I need to modify the output of my O2 sensor (specifically I need to drop the
> voltage my computer sees from the sensor).
>
> I know what you are thinking, don't ask.  This is hopefully only a temporary
> fix.  I will describe the whole system when it is working correctly.


Oxygen sensors on production engines are pretty much on/off (lean/rich)
type sensors. I would expect that the sensor signal processing starts with
some kind of comparator in an EFI control unit.
Having that said, if you still want to divide your signal, I would suggest
a high input impedance circuit as the internal resistance of a ox sensor
is quite high (several 100 kohm, and it varies with temperature, age, etc.).

Good luck, Peter
--
Peter Orban
National Research Council of Canada
Internet: peter.orban at nrc.ca




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