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Breathalyzer Microphone

Step 14Test your connections... again

Test your connections... again
Before all of the components are soldered in place on the microphone, it would be ideal to determine which wire is going where when the XLR cable is connected.

So, first of all, connect the XLR cable to the microphone. Connect the other end of the cable to the 1/4" plug.

With the continuity tester on your multimeter test to make certain that the black wire connected to the 1/4" plug makes a connection with the other black wire coming out the top of the microphone.

Next determine which red wire coming from the 1/4" plug corresponds to the red wire coming out of the top of the microphone that is connected to the switch. This is easy to test because when the switch is turned on, they should make a connection and when the switch is turned off, the connection should be broken. Once you found these two wires, mark them with a piece of tape.

For good measure, double check that the other two red wires that aren't marked also make a connection when tested with your multimeter.
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