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A phonograph pickup in which movements of the needle in the record groove cause deformation of a piezoelectric crystal, thereby generating an audio-frequency output voltage between opposite faces of the crystal. Also known as piezoelectric pickup.



Related Terms

CRYSTAL MICROPHONE

A microphone in which deformation of a piezoelectric bar by the action of sound waves or mechanical vibrations generates the output voltage between the faces of the bar. Also known as piezoelectric microphone.

COMPARATOR CIRCUIT

An electronic circuit that produces an output voltage or current whenever two input levels simultaneously satisfy predetermined amplitude requirements; may be linear (continuous) or digital (discrete).

CAPACITOR PICKUP

A phonograph pickup in which movements of the stylus in a record groove cause variations in the capacitance of the pickup.

COMMON-MODE VOLTAGE

A voltage that appears in common at both input terminals of a device with respect to the output reference (usually ground).

COMMON-MODE ERROR

The error voltage that exists at the output terminals of an operational amplifier due to the common-mode voltage at the input.

COMPLEX RELATIVE ATTENUATION

The ratio of the peak output voltage, in complex notation, of an electric filter to the output voltage at the frequency being considered.

BOOTSTRAP CIRCUIT

A single-stage amplifier in which the output load is connected between the negative end of the anode supply and the cathode, while signal voltage is applied between grid and cathode; a change in grid voltage changes the input signal voltage with respect to ground by an amount equal to the output signal voltage.

BUFFERED FET LOGIC

A logic gate configuration used with gallium-arsenide field-effect transistors operating in the depletion mode, in which the level shifting required to make the input and output voltage levels compatible is achieved with Schottky barrier diodes. Abbreviated BFL.

COMMON-MODE GAIN

The ratio of the output voltage of a differential amplifier to the common-mode input voltage.

CURRENT REGULATOR

A device that maintains the output current of a voltage source at a predetermined, essentially constant value despite changes in load impedance.

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