Hi.
Some time ago I salvaged this Magnetic speed sensor, don´t ask where it come. It was from a computer or audio devices.
It come with a shaft and a circular magnet on top of it, like in this example:
A close pic:
what I know so far:
pin 4 and 8 are connected to GND, before disassembling the device, I could identify the GND.
pin 2 and 6 are connected together.
just labelled M318 on the pcb.
Thanks for any clue.