- 1). Remove the strings and the existing bridge from the instrument and replace it with the piezo bridge. The bridge will have a red and a black wire leading from it. Many piezo bridges and transducers are sold with a pre-amplifier that converts the piezo signal to a line-level for output to an amplifier. This will appear as a small plastic box or circuit board. There will be two input contacts for attaching the wires, two output contacts and possibly some volume and tone controls.
- 2). Heat up the soldering iron and melt one or two millimeters of solder onto the tip. Use it to coat the negative black wire leading from the pickup and hold it to the "GRND" or "-" contact on the pre-amplifier. Allow the solder to cool and form a solid joint. Repeat the process, soldering the positive red wire to the positive "+" contact.
- 3). Solder a length of wire from the negative output contact to the negative ring on the 1/4-inch jack socket. Repeat with another length of wire, connecting the positive output contact to the positive tip connector on the socket.
- 4). Mount the socket and the pre-amplifier on or in the instrument. Some units require holes to be cut and drilled to accommodate the equipment; others attach to the surface or interior using brackets or adhesives.
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