I used the below 555 timer PWM circuit to control the speed of a dc motor, and it works like a charm :)
now i have a requirement to change the PWM speed externally from another module, that module consists from a simple potentiometer, as shown below
both VCC and GND is common between the 2 modules. so basically what i need is to find a way to make the output signal from the POT, change the speed of the PWM output, alternative to change the R100k value in the first picture, i could not make it works at all :(
i also tried the VCO mode, but the result of motor speed was not reliable,
Thanks all in advance