I have designed a circuit with some resources from this website and I attached it here. I have given circuit connection in a breadboard and successfully run and control the speed of the motor. After a while, I moved on to the pad-per-hole PC prototyping PC board. I have given the same connection on that board. But there is no output from pad-per-hole PC prototyping PC board.
I checked connection thrice but there seem no flaws in connection. I have measured voltage in a circuit. It is as follows.
Input voltage for optocoupler - 1.2 V in breadbaord and 1.17V in pad-per-hole PC board. Output voltage(between c and E in phototransistor) - 0.005 V (in pad-per-hole board) Could not find what is the problem in pad-per-hole PC prototyping PC board connection. What might be the problem?