slotless model car track (2)

As described in last month`s article, the model cars are powered from the special race track, but steering and speed commands are provided by an infra-red communication link. The speed and direction of up to four cars can independently be controlled using a 9-channel time-division multiplexed `digi-proportional` control system. This month`s article describes the circuit of the multiplex encoder, and the principle of the decoder. The board layout for the infra-red transmitter will also be given.