Catalog > Consumer Electronics > Kits > Various Kits A3144 Hall Sensor on PCB A3144 Hall Sensor on PCB HKD THRESHOLD ADJUST HALL SENSOR A3144 HALL SENSOR ON PCB. ADUSTABLE THRESHOLD. USING LM393 COMPARATOR. 3.3/5V , MAGNETIC LINEAR HALL SENSOR 21.81 ZAR inc for 1 Each 20 in Stock Add Specifications, Prices & Availability may change without notice. Images are for illustration purposes only. E&OE Features Linear Hall magnetic module and number 13 comes with LED build a simple circuit to produce magnetic field warning lamp. Use digital 13 interface comes with the LED. The linear Hall magnetic module connected digital 3 interfaces. When the linear Hall magnetic module senses detected the key signal. LED lights on, otherwise off.