Patent
1979-05-14
1981-07-21
Konick, Bernard
179 1A, 179110A, G10H 500
Patent
active
042800188
ABSTRACT:
An integrated piezoelectric sound transducer and preamplifier is provided within a sealed enclosure and the preamplifier is powered through a coaxial cable utilized for the AC signal output of the preamplifier. By integrating the transducer and preamp, cable noise is eliminated. The preamplifier is implemented with a single FET connected in a source-follower configuration. The gate of the FET is connected to circuit ground through the internal resistance of the piezoelectric material and mass of the transducer, and the drain of the FET is connected to an external power supply through the internal conductor of the coaxial cable that is AC coupled to the source of the FET by a capacitor. In the case of bipolar power supplies over the coaxial cable, the source is connected to either circuit ground or the other polarity of power through a separate diode and filter capacitor. A multiplexing switch receives the two power supply voltages while transmission of the audio signal from the transducer takes place while either power supply voltage is received. A filter in the enclosure isolates the AC signal on the cable from the drain.
REFERENCES:
patent: 3405288 (1968-10-01), Dittrich
patent: 3701865 (1972-10-01), Carlson et al.
Lazarus Arnold
Weiss Stuart L.
Konick Bernard
Popek Joseph A.
Strobotronix, Inc.
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