How about something like this? (below image)
I use this particular hall effect in a very similar fashion for ignition systems on miniature 4 stroke engines.
In that instance the metal strip is a series of metal "fan" blades (for want of a better wording)but the principle is the same.
Note the use of the small capacitor right on the supply terminals of the hall effect. Do not use without it.
Any type but I use a very small ceramic cap.
You can us a high current (60A) or so P type mosfet without changing anything.
I use this particular hall effect in a very similar fashion for ignition systems on miniature 4 stroke engines.
In that instance the metal strip is a series of metal "fan" blades (for want of a better wording)but the principle is the same.
Note the use of the small capacitor right on the supply terminals of the hall effect. Do not use without it.
Any type but I use a very small ceramic cap.
You can us a high current (60A) or so P type mosfet without changing anything.