2017 update - This pendulum has been running non-stop since 2009. I will continue to keep it running. I replace the battery and it keeps on swinging.
The single electromagnetic coil in this circuit serves a dual purpose. It's used as a timing sensor and is also used to repeal the magnet keeping the pendulum swinging. The pendulum will swing for 3 months on 2AA batteries. This pendulum has been running 24/7 for the last 7 years without any adjustments.
The pendulum arm swings on a single skateboa
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