I'm attempting to build a circuit that will sense DC in a line, send a monopulse to a reciever to turn on a remote LED. Then when the DC is no longer present, the remote LED should turn off. The range is only about 6 ft. I'm trying to make this as small as possible. I'm familiar with electronics and wiring, but not the components necessary to make this happen.
Any help would be great.
Any help would be great.