DIY Rechargeable Continuity Tester – Handy Electronics Tool

A rechargeable continuity tester is a useful tool for checking wires, circuits, and connections. Unlike a basic tester, this version uses a rechargeable battery, making it portable and long-lasting.

Materials Needed

• Small buzzer or LED

• 3V–5V rechargeable battery (18650 or Li-ion)

• Charging module (TP4056)

• Switch

• Resistor (if using LED)

• Wires & soldering tools

• Small plastic box

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How to Make the Continuity Tester

1. Prepare the Box
   Use a small plastic box to hold all parts.

2. Install Buzzer / LED
   This will give sound or light when continuity is detected.

3. Connect Battery
   Wire the rechargeable battery to the circuit.

4. Add Switch
   Use it to power ON/OFF the tester.

5. Add Probe Wires
   Attach two long wires as test probes.

6. Test It
   When the probes touch a closed circuit, the buzzer beeps or LED lights.

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Why This Project Is Useful

• Saves money on buying testers

• Portable and rechargeable

• Great for electronics students

• Essential for checking circuits

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