Here are some of the example circuits and tutorials for generating pwm using 555 timer ic and op amp ic
http://www.maxim-ic.com/app-notes/index.mvp/id/3201
http://www.instructables.com/id/OP-AMP-PWM/
http://www.instructables.com/id/Simple-and-dirty-Pulse-Width-Modulation-PWM-Wi/





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