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Problem measuring AC channels drops with a Raspberry PI

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Liken said:
Do I need to calibrate
Click to expand...
You can add a simple resistor and change the delay time. If you want to hand solder one resistor.
KeepItSimpleStupid said:
I want to make you aware of this:
Click to expand...
Post #20 is very close to what is on the board. The schematic in post #1 is not what is on the board. What is on the board is in post #12.
What KeepItSimple posted will have the same problem. The opto, used like this will have a 2:1 variation in delay alone, if all other parts are perfect.
 
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