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Quartz pendulum wall clock circuit.
Conversely when the pendulum swings the other way the vane must continue to interrupt the light.
This pulse is inverted by ic1a and inverted again by ic1b which then clocks ic2 a 4013 flipflop.
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This means that with the pendulum swinging in 0 5s beats we get a short pulse from the photo interrupter at 1s intervals.
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I wasn t expecting the circuitry in this unit to be so clever.
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