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Simplest possible hall-effect circuit

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Grossel

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Hi.

Is it possible to turn off/on a led based on input from a hall-effect sencor using a single NPN transistor (or very few transistors) and resistors.

Did a google search for hall effect sencors, but all chematics includes at least one comparator/opamp.
 
Try A3212 from allegro or AH180 from Diodes.
This are available in both through hole and SMT versions.
 
Thanks for reply, but I already have a couple of hall censors laying around. They have four pins, and I want to make some use of them.
 
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