Facebook social media iconTwitter social media iconYouTube social media iconSubmit to Reddit

Piezo-electric microphones

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...

FREE EBOOK DOWNLOAD ►
Come on the FREE COURSE TOUR

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.

FREE EBOOK - Equipping Your Home Recording Studio

Equipping Your Home Recording Studio

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.

By David Mellor Thursday May 1, 2003
Come on the FREE COURSE TOUR