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Pulse train to sine wave converter

Pulse train to sine wave converter
This circuit converts a serial pulse train into a sinusoidal output voltage consisting of 30 discrete steps. The 4-bit output of up/down counter TC1, QA-QD, is applied to the inputs of a 4-to-16-line demultiplexer, IC3. Counter IC1 supplies binary codes that repeatedly scan the range 0000 through 1111, and then back to 0000 again.
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