Remote Control Schematic

simple single channel on/off remote control (and reciever) Schematics?

i need schematics for a very simple on/off remote control to breifly open the circuit of a 9v battery to another device. (a schematic with this integrated would be nice)
it cant be an IR transmitter because the receiver will probably be hidden under a couch or something. (so the reciever needs to be small, too)
I’ve been looking up schematics for the past hour, only to find complex 4 channel+ transmitters/receivers (mostly for sound and such).

You need an RF transmitter and receiver set, usually a CW system at 433 Mhz.

On the transmitter, you need a coder ( to send a transmitter and button specific digital code), and on the receiver a decoder to decode the transmitted code. You can do that with a microcontroller, or with a purpose made chipset.

Bluetooth / Accelerometer Remote Control Tank from Cell Phone + Code + Schematic