Ed Anderson wrote:

Charlie, I looked into adapting my EFISM to use a wide band O2 sensor, I
though it would be simple - just a different (more linear) O2 sensor
voltage output range - however, the problem is the control circuit
required to maintain the precise sensor temperature (needed for any
accuracy) is more complex than that required to simply read the sensor
signal.  In fact, from what I have read if you do not control the heater
temperature precisely - not only does accuracy suffer but the life of
the sensor is also shortened.  Bosch does have a control chip - but its
almost as large as my circuit board and not cheap.

There are a number of DIY wide band units that are available.  My
favorite is located here:

http://techedge.com.au/

BTW, Ed, the "How the Wideband Sensor Works" link at the bottom of http://www.megamanual.com/PWC/index.htm has enough
math to keep you busy for at least 20 minutes 8*).

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