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Adventures In Audio with Audio Masterclass
Piezo-electric microphones

Piezo-electric microphones

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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.

Ebook = Equipping Your Home Recording Studio
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David Mellor

Layout, Signal Flow & I/O

Layout, Signal Flow & I/O

This high level audio course is essential knowledge for anyone who wants to learn how analog consoles and their state of the art studios are "wired up." It gives you the deepest possible understanding of mixing console Signal Flow and I/O both analog & digital.

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David Mellor

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