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SM3 7 SM3 7 COUPLING THE AUDIO OUT TO A MICROPHONE INPUT: The SM3's audio can ... be easily coupled into a microphone input for a PA system or ... radio. You only need to simulate a speaker connected and add an audio ... coupling capacitor. Both parts are available at Radio Shack. FINISHING TOUCHES ... siren can be easily mounted in most any handy box or enclosure. A coffee or ... juice can makes a dandy enclosure for speaker, battery, ... siren and pushbutton. Use your imagination, and ... see how much use and fun you can get for such a small kit ...