Hi, I built this circuit here:
http://razorconcepts.net/photoresist.html
In breadboard form, it works fine. But I constructed it on perf board, exactly the same but instead of LED outputs the outputs are left hanging so that I can read it with the multimeter.
No matter what, the outputs are always low. I tried using a 4v supply and a 9v supply. I verified the voltages going in to the comparator as correct, but the voltage coming out of the output is always low. Any ideas?
http://razorconcepts.net/photoresist.html
In breadboard form, it works fine. But I constructed it on perf board, exactly the same but instead of LED outputs the outputs are left hanging so that I can read it with the multimeter.
No matter what, the outputs are always low. I tried using a 4v supply and a 9v supply. I verified the voltages going in to the comparator as correct, but the voltage coming out of the output is always low. Any ideas?