Pulse Position Modulator Circuit

Here’s the design circuit for pulse position modulator can be easily built using 555 IC. Here’s the figure of the circuit;

Pulse position modulator modulate the on-period while keeping the fixed off-period. Pulse position modulation might substitute pulse-width modulation in some application. The main difference between pulse position modulation (PPM)  and pulse width modulation (PWM)  is that  unlike PWM, PPM doesn’t keep constant frequency. [Circuit diagram source: National Semiconductor Application Notes]

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