control circuit for DC motor

I present to you this circuit , that makes PWM using 741 operational amplifiers .

- the first amplifier makes pulses , then the second amplifier makes an integration to the pulses -- to make a triangle wave , and third amplifier work as a comparator , that compare DC with triangle wave , then the out put will be PWM .

That looks a bit complicated considering it can be done with two 741s or a single LM1458 or LM1558.

Here's an example of how to use it to dim LEDs.

There are more than one way, and I thank you for your reply