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In this article, I discuss making a synchronization circuit for the antique “Cifra 5” (Digit5) flip clock model, so that remote “receiver” clocks work even when disconnected from a central “signaler” clock and two-wire bus.
This Precision DDS Signal Generator has an output frequency of 100kHz to 75MHz in 1Hz steps (with ±0.1Hz accuracy after calibration). It runs from a 5V, 140mA supply and has low RF leakage. by Charles Kosina