Multi Channel Link Transmitter Circuit

This circuit is a multi-channel link is considerably more complex than a single channel design but it offers the possibility of designing a project that has more features. The multi-channel transmitter shown in the figure has forward, stop, reverse as well as left, centre, right steering. This is the figure of the circuit;


When the transmitter is not operating, the receiver picks up hash (background noise) and no outputs are activated. This represents the STOP function. When the forward function is selected on the transmitter, the square-wave oscillator operates at its high frequency setting, with an equal mark-space ratio. If left-turn is selected at the same time, the mark-space ratio is altered to 1:3 while the frequency remains the same. If right-turn is selected, the mark-space ratio is 3:1, with the same frequency. If the reverse function is selected, the frequency of the oscillator is reduced to half and if the centre steering is selected, the mark space ratio is 1:1. If the left steering is selected, the mark-space ratio is 1:3 and if right steering is selected, the mark-space ratio is 3:1. To understand how the channels are produced, you need to know how a multi vibrator works.