Originally Posted By: Mac
A bridge sliced in half horizontally, with piezo in between the two bridge pieces, works a treat and is more sensitive than the under-the-bridge method.

Another tack would be to provide a single piezo immediately under each string, then mix the outputs together via preamp buffer amps into the preamp. This method allows for a bit of gain tailoring to suit each string.

There is a flexible piezo film or tape available, I've gotten free samples by contacting mfrs and vendors. This stuff is great and does not suffer from the typical ~5K resonance of the brass backed disks.

http://www.imagesco.com/catalog/sensors/film.html

http://www.meas-spec.com/piezo-film-sensors.aspx

Don't think that cost is an issue, this stuff is cheap, actually.

Mouser Electronics lists this one fer under two bucks:

http://www.mouser.com/ProductDetail/Meas...QgErPGXE%2fc%3d

Output and hookup is virtually identical to what you need to do electrically with the disks.

A piece of piezoelectric film between bridge and top has worked well for me in amplification of true acoustic bass fiddles, archtop guitars, violins and even on piano soundboards.

piezo film can be used to measure vibration, g-forces in acceleration and even can work as temperature sensors, too.

Near zero self resonance in pickup applications.

--Mac

Gonna look into the film.Did not like the RS piezos. The bridge kicked out on me and ripped off the wires. LOL.

John
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