Fixed Frequency voltage controlled PWM circuit with 2 555s

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03:07:46

Left 555 is an  astable that generates narrow trigger pulses for the 555 on the right which acts as a voltage controlled monostable using pin 5 to control pulse duration consequently the output waveform from the 555 on the right is a variable pulse width controlled by the voltage on pin 5. Note that the Pulse width to voltage relationship is not linear. If a current source is used to charge the timing capacitor instead of a resistor the PWM will be linearly related to control voltage on pin 5

published 8 years ago

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