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need advice: adapting '94 940 speedo to an '87 740 700

posted by  benglar on  Thu Jan 17 05:28 CST 2002
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last visit: Mon Jul 5 09:23 CST 2010
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Thanks very much for the info. I had hoped for something simpler, but this is essentially what I expected.

I no longer have access to an oscilloscope to measure voltages on the signal and I'm not confident that my DVM can do the trick. Do you know the specs?

I assume that input and output are essentially square waves, measured with reference to the combined instrument's reference ground, and that it doesn't much matter which level transition (up or down) I use as long as I am consistent.

Hmm. I haven't designed or built any digital circuits since college 25 years ago. This ought to be fun.






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