Here’s a design that should gladden the hearts of many model builders. A really small proportional remote control unit built using standard - low-cost components. It’s ideal for loads of applications and so flexible that simply by changing on-board jumpers you are free to choose the transmission medium: radio, Infrared or two-wire!It used to be that constructional projects using RF transmitters and receivers would only be attempted by the more courageous electronics enthusiasts. Thankfully since the advent of complete integrated RF modules we can forget the tedious set-up and adjustment process and just treat the RF stage as another plug-in building block. The design described here is very flexible and can use these RF modules to implement a radio remote control. Microcontrollers are also employed in the transmitter and receiver to replace the discrete shift registers, clock generators and timing circuitry that you normally find in remote control designs. The result is a compact, reliable and low cost remote control unit. The low radiated power emitted by these licence-exempt radio modules limits the range of the units so this design is only really suitable for controlling indoor models.