Simple transmitter remote control commands were usually accomplished using a rotary telephone-type dial. Eventually, the rotary dial was replaced and capabilities were multiplied by DTMF control tones ...

With this circuit, a single transmitter and simple set of user pushbuttons can initiate one of four different outputs, two at each of two remote receivers with very different ...

[Joel] has a remote control ceiling fan. It’s nothing special, the controller has a low-power 350MHz transmitter and a Holtek encoder to send commands by keying the transmitter’s output ...

A discrete mute control lets you quiet the FM transmitter if necessary. The device is powered from the USB bus, and features user-adjustable output frequencies from 88.1MHz to 107.9MHz.