===== first circuit to circuit board: LED with switch and 9V battery =====

{{:led-on-circuitboard-01.jpg?600|}}

Make this circuit on your breadboard first.

{{:led-on-circuitboard-breadboard.jpg?600|}}

Then move it component by component to the circuit board, starting with the red wire which connects the power supply to the resistor. **Attach the switch and the power supply last.**

Be careful not to accidentally make wrong connections, and check your connections with the continuity detector in your multimeter.

When you are finished, the underside will look like this:

{{:led-on-circuitboard-02-finished-underside.jpg?600|}}

After you have tested everything, you can snip off the long ends with a wire cutter.