Miniature acoustical transducer with filter/regulator power supply circuit
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United States of America Patent
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-
Apr 2, 1985
Grant Date -
N/A
app pub date -
Jul 11, 1983
filing date -
Jul 11, 1983
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A battery-powered miniature acoustical transducer system for a hearing aid, including a microphone and an amplifier, has a combination filter and voltage regulator incorporated in its power supply circuit; the filter/regulator includes a field-effect transistor having its drain and source electrodes interposed in series between one battery terminal and a first power terminal of the amplifier, a resistor connecting the source and gate electrodes of the FET, a transistor having its emitter and collector interposed in series between the other power terminal of the amplifier and the gate electrode of the FET, and a junction diode connected from the FET source electrode to the transistor base, the diode junction and the base-emitter junction of the transistor both having highly non-linear voltage/current characteristics.
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