Home Made Continuity Tester

Introduction: Home Made Continuity Tester

About: i'm a teacher who loves to encourage creativity

Hi there if you want to build a continuity tester to check potentially broken cables, you've come to the right place.


- 1 Led/Buzzer.

- 1 1.5 volt battery(AA / AAA).

- Some cables.

Step 1: Building the Tester.

Connect up the led, and battery as shown in this circuit diagram.

If the Led/Buzzer does not work when you touch the two tabs together, the you should turn the Led around.

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    Tip 1 year ago on Step 1

    If you are using a buzzer, please please add a flyback diode to it. Often, buzzers which run on DC are or the magnetic kind and generate very high voltagespikes in its sound-frequency. Those spikes can kill your electronics you are testing for contunuity.