PDM_WITH_CLOCK_Circuit Diagram World 
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2017-01-08 06:21  
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First section of Exar XR-2556 dual timer operates as pulse-duration modulator and second section as clock generator, eliminating need for external clock, Supply voltage is 4.5-16V. Values of R and C determine frequency and pulse duration of output.- Timer Data Book, Exar Integrated Systems, Sunnyvale, CA, 1978, p 23-30.