This pulse is inverted by ic1a and inverted again by ic1b which then clocks ic2 a 4013 flipflop.
Quartz pendulum wall clock circuit.
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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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Conversely when the pendulum swings the other way the vane must continue to interrupt the light.
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Include hands quartz diy wall clock movement mechanism battery operated diy repair parts replacement.
I wasn t expecting the circuitry in this unit to be so clever.
Original youngtown 12888 pendulum type movement step clock accessory quartz diy movement kits 1 2 inch maximum dial thickness 9 10 inch total shaft length.
Original youngtown 12888 pendulum type movement step clock accessory quartz diy movement kits 1 2 inch maximum dial thickness 9 10 inch total shaft length.