I found this on the hackaday main page. I think its a concise and clear explaination of PWM.
http://www.afrotechmods.com/groovy/PWM_tutorial/PWM_tutorial.htm
Pulse Width Modulation (PWM) tutorial
I have found a number of sites with good circuits, one even has a decent layout of a Vero board. Step by step.
www.cpemma.co.uk/pwm.html
Grumpy-b
www.cpemma.co.uk/pwm.html
Grumpy-b
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