Hi;
I want to produce a 0-5V adjustable DC signal(reference voltage) with an 89C2051 for dc motor control. For this purpose i produced a 5khz. adjustable pwm signal and connected the pwm out to RC filter via an optocoupler. Now my question is how should i select the time constant of the RC filter? What is the analytical way of calculation?
Thanks in advance.
M. Demirci.