Originally posted by Les_K
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Have you tried adjusting this magnet to bias the core in a region where the largest possible change in permeability occurs when the wheel magnets pass?
Take a single coil, disconnect it from all else, and place an LC meter on it. notice its maximum inductance.
Take the largest magnet you can find and saturate the hell out of it, notice its minimum inductance.
Now bias the core with a magnet on the rear. Note the inductance. Now pas one of the wheel magnets over it slowly and note the minimum inductance you get. Note the difference between biased inductance and biased inductance with magnet from wheel at top dead center with the coil.
Now adjust the biasing magnet and try again, shooting for the greatest possible differential in inductance values, this is now a tuned coil.
Re connect it, and start again with the next coil and so on.
The coils look as if are set up so that the EMF induced in one coil is shuttled to the next as the next has its inductance value changed.
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