Pulse position modulator can be easily built using 555 IC. Here is the schematic diagram 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's schematic diagram source: National Semiconductor Application Notes]
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