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Old 06-08-2015, 11:32 AM   #47 (permalink)
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Originally Posted by Theitguy View Post
how would it affect the injector circuit if i used a different opocoupler? say a 4N28/4N25?
Should work. The trouble I ran across with the optocoupler was that it distorted the measured pulse length. The rise and fall times of the opto's output are different, and depend on the value of the pull-up resistor (10k-ohm on my diagram). If you have a reference signal, you could measure the distortion and subtract it in software.
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