In their formative years, crystal microphones were commonly found used in the handsets of telephones and also incorporated into public address systems.Ĭeramic piezoelectric microphones were also used heavily within the Radio and Broadcasting industry.
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So if they weren’t being used in professional music studios, what were the primary applications of the piezoelectric microphones? Where To Find Piezoelectric Microphones In Use As a result, they were never considered to be suitable for professional studio environments.
The top end of a crystal microphone is generally limited to a frequency (pitch) of around 10khz, and the design of the Piezoelectric microphone also limits its inherent transient response.ĭespite having a high output, the frequency response of the Piezoelectric microphone did not match that of professional-level Dynamic and Condensor mics at the time. These materials were eventually altered to incorporate ceramics such as Barium Titanite and Lead Zirconate, making the microphones more resilient. However, it was soon discovered that this made them susceptible to moisture and heat, which was not ideal. Piezoelectric Microphone Materials, Construction & Specsįun fact - early Piezoelectric crystal mics used salt to produce signal. While most microphones will produce a signal by detecting vibrations in the air, Piezoelectric transducers depend on contact with solid objects to produce a signal.Īs a result, Piezoelectric transducers are sometimes referred to as contact microphones.These charges are directly influenced by the amount of deflection on the crystal, and they inherently subside as the stress is released.In a crystal microphone, a thin piece of Piezoelectric material is attached to a diaphragm, and as the diaphragm deflects the crystal, it receives opposite charges on either side.With that out of the way, this is how a piezoelectric microphone actually works: Piezoelectric mics differ from their counterparts because they use a Piezoelectric crystal as a transducer. The Piezoelectric or Crystal Microphone was developed in 1917 by French physicist, Paul Langevin. So, with that said, let’s take a close look into the world of Piezoelectric microphones. If not, a quick search of this blog will surely enlighten you in no time! It’s safe to assume that most of our readers will be familiar with the form and function of dynamic, condenser, and perhaps even ribbon microphones.
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