How to generate variable duty PWM signal using 555 timer with Analog DC input (0-5Vdc), instead of using a potentiometer (between pin 7 & 6) - Quora
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voltage - Is there a way to control the PWM duty cycle of a 555 timer without using a variable resistor? - Electrical Engineering Stack Exchange
![voltage - Is there a way to control the PWM duty cycle of a 555 timer without using a variable resistor? - Electrical Engineering Stack Exchange voltage - Is there a way to control the PWM duty cycle of a 555 timer without using a variable resistor? - Electrical Engineering Stack Exchange](https://i.stack.imgur.com/7hLu1.jpg)