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pwm with operational amplifier 741

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crutschow

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What frequency PWM?
What supply voltages do you have?
 

crutschow

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picmicro1

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I would use two opamps to create a triangular wave generator, then use another as a differential amp to output a pwm..

Google opamp PWM and look at a couple of examples..
does differential amplifier convert triangular to pwm?
 

alec_t

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Feed the triangle wave and a reference voltage to a comparator (another opamp can be used for that). The comparator output is pulses with a duty cycle determined by the reference voltage (which can be adjusted).
 

alec_t

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does it remain stable pwm
Yes, if the reference voltage and the triangle wave are both stable.
how to add pid controller to it?
Generate proportional, integral and differential control voltages and use a summing amplifier to combine them to produce the reference voltage.
 

alec_t

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Depends what your PID controller will be controlling.
A simplistic way would be to use a potentiometer for the P signal, an RC circuit (series resistor, shunt capacitor) for the I signal and a CR circuit (series capacitor, shunt resistor) for the D signal.
I suggest you read up about PID controllers.
 

DerStrom8

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Folks, this is Ritesh Kakkar again. You will not get anywhere with him.

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