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Thread: Simplest possible hall-effect circuit

  1. 29th July 2009 07:43 PM #1
    Grossel
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    Default Simplest possible hall-effect circuit

    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.
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  2. 29th July 2009 07:47 PM #2
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    Seems some can drive LEDs directly.
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  3. 29th July 2009 07:48 PM #3
    dpj
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    Try A3212 from allegro or AH180 from Diodes.
    This are available in both through hole and SMT versions.
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  4. 29th July 2009 08:20 PM #4
    Grossel
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    Lightbulb

    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.
    Last edited by Grossel; 29th July 2009 at 08:21 PM.
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