Optical Direction Discriminator Circuit

  
The very simple circuit uses only two CD4001 packages, i.e., eight NOR gates and operates in the following way: Pulse streams are fed to an RS flip flop generating an output waveform wliich has a small or large duty cycle depending on the direction of rotation, The same input pulses are also fed to a NOR gate, which adds the two pulse trains. The rising edges of this waveform are used to produce short positive pulses from the circuit consisting of Rl, CI, D3, and a NOR gate used as an inverter. This is used to sample the outputs of the flip flop to detect the direction of rotation.

The output, whose duty cycle is large, forces the sampling NOR gate to generate a pulse train which sets (or resets) the second RS flip-flop continuously giving a permanent indication of the direction of rotation.




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