Hi, I'm very new to circuit building and this o2 sim is my first ever circuit build... I have built this o2 sim on a circuit board and its working k..
http://mkiv.com/techarticles/oxygen_sensor_simulator/index.html.

My question is, is there a way to make the voltage not go to 0 Volts when the 555 timer switches low. Right now when the timer wave is high i have about .8 volts (can be adjusted with pot) but when the 555 timer wave goes down(low) the voltage goes to 0 volts.....My bikes ecu does not like the 0 volts and it goes to rich condition when it sees it...i would like to keep .5 volts(adjustable with pot) when the 555 timer goes low (switches off)..and have .8 volts on high wave..

Is this possible...

Any help would be greatly appreciated ..

Thank you.

 

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