TheEquineFencer
New Member
OK, here's the idea. I am looking at a WideBand O2 monitor. It has a digital readout plus it has a 0-5VDC output for use to connect to an external ECM for an engine. The manufactor says I cannot use the 0-5VDC programmable anolog signal to power anything, but I think it is possible. What I want to do is figure out a way to do it. I know it has to be able to handle some kind of load in the lower Milliamp range. I'm thinking if I figure out how to take the 12-15VDC power source, (battery/alernator from car), regulate a 5VDC and feed it to something like a LM339 with a potentiometer, that way I could adjust the trigger point based on the analog signal from the WBO2 monitor, then feed the LM339 output signal it to a N25 opto and let it do the main switching for any other device I want to power off the analog signal. The 0-5VDC analog signal is equal to 10/1-20/1 Air/fuel ratio and the anaolg output can be programmed for a lineiar slope. I realise I'll need to use the same ground referance point for the whole system or I might get off because of a voltage rise accross the ground path. I'm still learning this stuff so don't feel bad over simplifying something. I have a good grasp on some of this, better than the average Joe off the street. I guess I need to figure out what Zener diode will work for a regulator and how to build a comparator circuit like I need. Feel free to jump in, thanks, Floyd
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