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Hall Effect A3144 - latching circuit ?

RobinHart

Hello. Please can someone advise a circuit to latch the high output of an A3144 Hall Effect sensor ? Using a thyristor maybe ?

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  • 0 in reply to RobinHart

    You could try a Hall effect latch such as the ones made by Allegro. A 3 wire chip will sense the magnet and the output will latch and sink 12 mA - which is enough to drive an LED. If you remove the magnet they stay latched. If you reverse the magnet they would turn off, but you don't need to do that. If you remove power with a an NC pushbutton the device will reset to a fault condition (which is off). That is about as simple and compact as possible. Parts numbers include APS12450, APS12400, A1260.