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Hall Effect A3144 - latching circuit ?

RobinHart over 3 years ago

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 rsjawale24 over 3 years ago

Hi!
You can use an SCR for latching. SCR's latches once triggered unlike BJTs. You can find many SCR based circuits on the internet.
For triggering the SCR, you can use an opamp based comparator and connect the output of the hall effect sensor to the opamp. Otherwise, it would be difficult to trigger the SCR just with the output of the hall effect sensor.
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0 rsjawale24 over 3 years ago

Hi!
You can use an SCR for latching. SCR's latches once triggered unlike BJTs. You can find many SCR based circuits on the internet.
For triggering the SCR, you can use an opamp based comparator and connect the output of the hall effect sensor to the opamp. Otherwise, it would be difficult to trigger the SCR just with the output of the hall effect sensor.
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0 RobinHart over 3 years ago in reply to rsjawale24

Many thanks. Would an open-collector device trigger the SCR directly ? I have 24 of these circuits to build on a single board and need to keep the physical size small ...
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