I know, a bit divorced from computers, but some of you genii out there might have some ideas.
Problem: I have just acquired a second VCR from my father in law. A different brand to the one I already have. I set it all up so that there are now 2 VCRs in my system. The problem is that both VCRs have the same remote control codes, which means that what ever I do on one VCR happens on the other too. A real pain.
I’ve tried to create a highly directional capture field in the VCR, but find that the IR signal somehow always gets through, even when the sensor is wrapped in aluminium foil (?). I’ve painted the whole sensor black (except for the lens), covered it with hot melt glue and painted that black as well. Makes no difference, the sensor still picks up the signal.
To make matters worse the second (original) VCR picks up the signal, even with a big (2’x3′) children’s book covering the whole front of it.
I’ve thought of replacing the IR LED in the remote, with a standard red LED and replacing the sensor with a photo transistor, but the photo transistor would still respond to the IR ( would need a red filter), however, I suspect that the sensor may be an IC with photo device, and decoder built into it.