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Permalink Reply by David L. on January 8, 2014 at 12:29am

These are self oscillating ones - they are really two piezos in one sharing a common ground. The wire to brass use as negative and use either both of the others as positive or just the one going to the largest amount of ceramic material.
Regards,
David L.

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Permalink Reply by Manny Lopez on January 8, 2014 at 5:18am

Thanks David!

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Permalink Reply by Dan Bullard on January 11, 2014 at 2:24am

Well said, David

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Permalink Reply by Ted Crocker on January 12, 2014 at 2:04pm

These are used as dual sound output devices, an example would be to play one sound for the front door doorbell and a different one for the back door.  I would solder your hot lead to the larger area and ground to the brass.  Using both areas won't make any change in how your guitar sounds, but if you choose to use both, wire them parallel (2 hot leads to jack or pot.) 

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