PWM to control a motor

Dear All,

Does anyone know how to calculate the avergae voltage output of
a PWM circuit,

if you know the period of the mark and space of the signal.

I want to be able to control a DC motor- rated at 10v

Does 50% duty cycle mean you get 1/2 of vcc to the motor.


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If I use a 555 timer, how can I implement a soft start to the motor

yup 50% duty = 50% voltage

Vout = Vin * Duty

quick question

Dear All,

How can I imitate an AUTOMATIC 'soft start' on a small DC motor,
if I am using a PWM, via a 555 timer.

The 555 timers mark/space is governed by external resistors,

Any ideas will be greatly appreciated.

Asjad,

Can you post the circuit you have so far?

Ante :roll: