Stan, you are right. I just started the following topic: "Pulse Width Modulation Control & Motors".
But first a question about your single and 2-detector IR circuits. I have the single working and it's fine as a test case, but to use it in application don't I have to add the transistor inverter scheme you posted earlier so that the relay is not ON when the beam is detected, and ON when the beam is broken? Otherwise, the relay coil would eventually burn out being energized all the time. Also, that's how I can add the capacitive delay as you showed.
