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Basic Clock Sources

Sequential digital circuits require a timing signal to control when and how often they may change state. The source of this signal may be any regular source of digital pulses, so long as it meets the circuit requirements of pulse frequency and accuracy.

For the purposes of test and demonstration circuits, it is often convenient to have clock signal sources that are slow enough to be seen and followed with the human eye. Then with proper operation verified, a faster clock can be applied to enable the circuit to operate at higher speeds.

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