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A modulus 10 counter uses flipflops and some associated logic to give you 10 stabile states. Each clock transistion will give you a change in output. There is a guy in the microcontroller section that is going to use a johnson counter to control the triggering of a one shot. With a latch on the last pin, he can trigger the one shot periodically to give to give him a pulse width modulated output. This is going to be summed with a clock to produce a special clock. Recall that a 555 will give you astable or one shot capability. The one shot has a variable duty cycle, but it will only produce it one time with a triggered input. You have to keep triggering the one shot if you want a continuous waveform.

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