I need to increase the speed by which it turns off (turn on is a little too slow too)

All I have are my eyeballs to evaluate the speed, and it seems slower turning on, than off, persistence of vision not withstanding.



I want to pair up this circuit, using two hall sensors, back to back, so that when a magnet turns one off, the other is turned on, and finally,
mate the signals to an H-bridge. (I'm trying to prevent shoot-thru.) Maybe it don't matter, cause hall sensors switch fast, so shoot-thru might
only last a milisecond?? What do the brains think?

 

You could use a hall switch which will switch fast.
For instance: https://docs-emea.rs-online.com/webdocs/13e7/0900766b813e7971.pdf

 

Make the 10M a 1K resistor, the fet Gate is high in capaitance.

 

For turn-off, you need a gate resistor to ground.

For the ultimate in speed, you need a gate driver to overcome the gate capacitance. The voltage across a capacitor can't change instantaneously hence, some slowness. Your not actively or passivly draining away gate charge when you turn it off either.

 

Something like this?


Max.

 

Something like this?
View attachment 186711

Max.

What's the diode for?

 

A way of discharging the Mosfet gate capacitance quickly.
Max.