How To Make Magnetic Tester With Hall Effect Sensor AH277A

What you need to build this Magnetic Tester - AH277A or apx9141 - 220 Ohm Resistor - red led - green led - power supply 5 volt - download circuit | http://j.gs/9lGg Follow Me https://www.facebook.com/Easyonee https://twitter.com/Eaasyone https://www.instagram.com/easyyone