I'm trying to make a simple IR circuit that energizes a coil when the detector "sees" the beam (refer to attached schematic). The problem is when the everything is active, I have almost no current at the coil. Why am I losing so much current? I suspect it's because the base of the NPN transistor is pulling through the variable IR detector transistor and there is a loss. Does anyone have a better way to do this?
58.1 KB Views: 29