I'm using a wireless RC device the will wait forever for a signal, but once it receives that signal it goes to power saving sleep mode after 5 minutes. It can be reactivated by pressing a button on the device, but I can't manually go do that. I need a circuit to effect that button closure about 1 sec after the device is activated. Once it's pushed, it will wait forever again for the next signal. I can do that with a 4N25 but I can't do it as soon as the device gets it's signal, I have to wait at least a second or two before I do that button short , or any time before it falls to sleep in 5 minutes. I need the simplest, smallest circuit, with the fewest, smallest components. Space inside this thing is very, very, limited . . . as is my knowledge. Any ideas?