Really nice "flip flap" pendulum kicker - with schematic

While attempting to clean this vintage solar flapping leaf ornament I found that the plastic had degraded to the point where one of the leaves broke off unexpectedly. This turned out to be a good thing, as I did a full reverse engineer of the circuitry and being older than the mass produced variants it is made with discrete components as opposed to the modern "blob" chips.

The circuitry is based on a two transistor stage that will self trigger at a threshold as the solar panel charges a capacitor, but can also be pre-triggered before that threshold by the current induced in the pulse coil. This arrangement lets it self-start, and then pulse the magnetic pendulum as it passes over the coil to keep it swinging at its resonant frequency.

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