556 (Dual 555) PWM Generator

Pulse Width Modulation using the 556 (Dual 555) Timer. Output period is set through the first timer which is a 555 Timer configured as a conventional astable multivibrator. Output pulse width is set through the second timer which is a 555 Timer configured as a monostable multivibrator. Adjustment is through Rpwadj. For the saved values: Period is roughly 1 ms. Pulse width is adjustable from less than 75 µs to greater than 975 µs. Please don't forget that there is only one shared power and ground connection. The extra capacitors on either side of the positive voltage are used to provide an A.C. path to ground for noise (EMI/RFI).