DIY Simple Circuit Continuity Tester




Introduction: DIY Simple Circuit Continuity Tester

So, you don't have a multimeter? You can make this continuity tester at home.

Circuit continuity tester is a device that indicate current can flow in
electronic circuit. This equipment can detect whether there is a break in wire or components.

Please note:

This tester is using 9V DC supply. It can over-voltage your electronic circuit and electronic components.

Step 1: Materials

Here are what you need to make this tester:

  • Active buzzer
  • Battery & Connector Cap
  • Wire Connector
  • Cables
  • Copper Wire
  • Plastic box
  • Small Markers

Step 2: The Circuit

In this step, we need to create the circuit first. The circuit is simple, connect battery with active buzzer. Connect wires of the same color.

Then test the circuit whether working or not by connecting cable ends.

If it is buzzing, then it works.

If it is not buzzing, then something wrong with the circuit. Check the cables and components.

After that, place the circuit in plastic box. Glue the battery and other components inside the box.

Step 3: Connect With Long Cable

Create a hole at side of plastic box, with solder or cutter.

Put the cable in the box through the hole.

Connect the inserted cable with tester circuit cable ends.

Step 4: Create the Probes

To create the probes, we need 2 marker tube cases and copper wire.

First, remove all parts inside markers. Put the copper wires into marker tube cases.

Then connect copper wires with tester cables.


Step 5: Test the Tester

It's time to test the tester.

Prepare a component like resistor, capacitor, motor, etc. Place the probes to both component ends.

If the tester is not buzzing, then try to swap the probes to other end.

If the tester is still not buzzing, then the component is broken.

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    4 years ago

    back in days pass we built basically the same thing for cable buzz out. all was fine until the device was exposed to a cmos circuit. we were using door bells and a 6 volt battery. the inductance pulse took out several circuits. a important device was taken down with the result all these were evicted from the facility. they work great on tube circuits but use extreme care with this device.


    4 years ago

    Looks good :) Thanks for sharing!