Lucky-cat and the curse of the blob chips

One day I'll find an older version of this type of unit that has the original circuitry.
It dates back a long way to when the first versions were made with discrete transistors and capacitors.

The schematic is just a rough doodle. It isn't a suggested circuit, as it would require a bit of experimentation with component values to find the sweet spot.

While the blob chips do reduce manufacturing costs significantly (it's a bare chip bonded to the PCB), it also takes some of the magic out of reverse engineering something like this.

For further exploration, the keywords on google are magnetic pendulum

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