Shure 55s microphone dating sites

The earliest devices used to achieve this were acoustic megaphones.Some of the first examples, from fifth century BC Greece, were theater masks with horn-shaped mouth openings that acoustically amplified the voice of actors in also called a capacitor microphone or electrostatic microphone—capacitors were historically called condensers.Here, the diaphragm acts as one plate of a capacitor, and the vibrations produce changes in the distance between the plates.Microphones typically need to be connected to a preamplifier before the signal can be recorded or reproduced.

The capacitance of the capsule (around 5 to 100 p F) and the value of the bias resistor (100 MΩ to tens of GΩ) form a filter that is high-pass for the audio signal, and low-pass for the bias voltage.Note that the time constant of an RC circuit equals the product of the resistance and capacitance.Within the time-frame of the capacitance change (as much as 50 ms at 20 Hz audio signal), the charge is practically constant and the voltage across the capacitor changes instantaneously to reflect the change in capacitance.The voltage across the capacitor varies above and below the bias voltage.The voltage difference between the bias and the capacitor is seen across the series resistor.

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There are two types, depending on the method of extracting the audio signal from the transducer: DC-biased microphones, and radio frequency (RF) or high frequency (HF) condenser microphones.

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