How to Work with Jumper Pads and PCB Traces

Contributors: bboyho
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Cutting a Trace Between Jumper Pads

Locate the trace that you want to disconnect. The function of a jumper can vary depending on the board's design. For more information, try checking out the associated documentation for your board.

In this example, we will be looking at the 5V FTDI Basic Breakout to adjust the default voltage level from 5V to 3.3V. On the back of the board are three pads. If you look closely on the back of a 5V FTDI breakout, the center and right pads are connected together with a trace by default. On the 3.3V FTDI, the trace is connected to 3.3V by default.

FTDI Jumper Pads for Voltage Selection

Using a hobby knife, carefully move the blade back and forth across the small trace to sever the connection under the red solder mask.

PCB Trace Cut with Hobby Knife