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Piezo-electric microphones

A post by David Mellor
Thursday May 01, 2003
You will hardly ever see a piezo-electric microphone these days. But if you look under the bridge of an electro-acoustic (acoustic-electric) guitar...
Piezo-electric microphones

The piezoelectric effect is where certain crystalline and ceramic materials have the property of generating an electric current when pressure or a bending force is applied.

This makes them sensitive to acoustic vibrations and they can produce a voltage in response to sound.

Piezo mics (or transducers as they may be called - a transducer is any device that converts one form of energy to another) are high impedance.

This means that they can produce voltage but very little current. To compensate for this, a preamplifier has to be placed very close to the transducer.

This will usually be inside the body of the electro-acoustic guitar.

The preamp will run for ages on a 9 volt alkaline battery, but it is worth remembering that if an electro-acoustic guitar, or other instrument with a piezo transducer, sounds distorted, it is almost certainly the battery that needs replacing, perhaps after a year or more of service.

A post by David Mellor
Thursday May 01, 2003 ARCHIVE
David Mellor has been creating music and recording in professional and home studios for more than 30 years. This website is all about learning how to improve and have more fun with music and recording. If you enjoy creating music and recording it, then you're definitely in the right place :-)