PPM is simply PWM + monostable multi-vibrator. Means if we fed the PWM output to trigger input of IC555 in monostable mode then the output of monostable will be PPM wave. So to generate PPM we require one astable multi-vibrator to generate PWM signal and one monostable multi-vibrator to get desire PPM. The final circuit and the waveforms are as shown in Circuit Diagram 2 tab.
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Filed Under: 555 Timers, Electronic Projects