PAS - where are my magnets?

[808]

I have a PAS but can not find the magnet(s). I have two concentric ferrous rings on the drive-side crank and a stationary circuit card mounted to the frame, inboard of the crank. How does this PAS detect pedaling and acceleration?

 

[E-HP]

Picture?

 

[808]

Here are chainring (gray, ferrous material - indeed light magnetism) and frame-mounted cca (green).