Can a Paper Clip Be Used as a Jumper Wire?

Yes, a paper clip can be used as a jumper wire in low-voltage applications. In this article, we will explore various factors to consider when using a paper clip as a jumper, its limitations, and useful applications where it can serve as a practical, temporary solution.

Conductivity and Current Rating

Paper clips are typically made of metal, often steel or galvanized wire. These materials are conductive, but they have a higher resistance compared to copper. Therefore, while a paper clip can be used as a jumper, it should not be used in high-current situations as it may overheat or become damaged. For low-power circuits, however, it works well as a makeshift solution.

Connection

It is crucial to ensure that the paper clip is securely connected to the terminals or points in the circuit. You may need to bend it into a suitable shape to make good contact. Poor contact can lead to intermittent connections and unreliable performance.

Insulation

Be cautious about short-circuiting other components. Ensure that there are no exposed parts of the paper clip that could touch unintended areas. Proper insulation is essential to prevent accidental short circuits and ensure safety.

Temporary Use

A paper clip is best suited for temporary connections during prototyping or testing. For permanent or critical connections, it is essential to use proper jumper wires. Proper jumper wires are designed to handle higher currents and provide a more reliable and safe connection.

Practical Applications

I have used paper clips as jumpers in various scenarios. For example, when working with software device drivers and testing RS232 communications, I would often use a paper clip to bridge pins 2 and 3 on a DB25 or DB9 connector. This allows me to quickly verify the wiring setup and test the communication between my software and the device. It is particularly useful during the initial setup phase of a driver or device communication test.

On occasion, I have also used paper clips as substitute PCB stakes. They are sturdy and easily available, making them a convenient choice for temporary soldering. If more robust hardware is not available, a paper clip can be soldered to a PCB, providing a temporary solution until proper components can be sourced.

While paper clips can be a practical and cost-effective solution, it is essential to handle them with care. In some cases, more specialized equipment and materials are required to ensure reliability and safety. Always consider the current rating, connection quality, and potential for short circuits when using paper clips as jumpers.