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How to build the simplest PWM(Pulse Width Modulated) DC Motor Speed controller using Op Amp

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I show how to build a efficient PWM circuit to control DC motor speed, LED strip brightness, etc.
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Advantages of this circuit over the 'classic' 555 PWM might be
1. Higher operating voltage i.e. 32v MAX if LMx58 is used
2. Two independent controllers can be built using a single IC
Try adding different value capacitors observing polarity across the motor to get rid of switching noise.
Input Voltage = 5 - 30v
Current handling capacity almost entire depends on the MOSFET/BJT used as switch. A heat sink should be added for controlling higher currents
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