non-reversible reverse engineering of an electric toothbrush

i always wanted to study how the inductive charging in such devices actually works and i decided to open an old braun tooth brush to study it.

here’s two gifs:

toothbrush standing

toothbrush

 

you can open the toothbrush by destroying the snap-ins underneath the plastic protection:

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this is the final charging setup, in the end it didn’t work anymore, the battery is probably dead, i may connect a standard 1.2V NIMH battery to it and see what it does. the multimeter showed about 300mV on the receiving coil which seems a bit too low to me but that might also mean that the battery is dead?

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here’s the chips, if anyone’s interested:

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