Inside a Bumble Ball - with schematic

Published on 2024-01-17 | Archived on 2024-01-22

The circuitry in this toy was more sophisticated than I was expecting. Mainly for safety and electrical interference reasons.
These were apparently first marketed as a dog toy, then evolved to become a kids toy too.

The construction is mechanically quite complex to allow activation of a free spinning assembly inside the ball. The circuitry has lots of protection for overcurrent if the motor stalls, and its notable that as the current increases the voltage at the source (negative) connection of the MOSFET will rise, potentially acting as current regulation.


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