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*).