Hall-High-Hat-Hack-Schematic
From Just in Time
R1 and R2 are pull-up resistors which were necessary because the used quad comparator had open-collector outputs. If you have a comparator with output resistors, you can leave them out. VR1 and VR2 go to the output jack, polarity is irrelevant. The Hall sensor is connected by a pin header for easier assembly. The middle pin of the header is the sensor output, pin 1 is +V and pin 3 is Ground of the sensor. R8 and R10 are intended to optimize the adjustment range of the sensitivity, but can also be left out if you use trimpots. Make sure to connect unused inputs of the leftover comparators and switches to ground or +V to avoid oscillations.
