Repairing your Sonicare

Step 2 Top

This is the top coil, which controls vibrations to the toothbrush head. I know the head has magnets on it, but how does it work...?

Comments

[spiderx]

It works just like a speaker does, except this coil is the "speaker coil" and the head is the permanent magnet. Apply a voltage to the coil, and it repels the magnet. Apply the opposite voltage, and it attracts the magnet. Since it works the way a speaker does, they decided to call in "sonicare" since all they have to do is push a 700hz signal through the coil... actually, its a 666(and 2/3)hz signal, to get 40,000 cycles a minute

[xoshooter]

What is the little grey dot used to turn the unit on or off? I need to replace that and doing a search for membrane switch, waterproof switch turn up zilch. thanks