Miniature acoustical transducer with filter/regulator power supp

Electrical audio signal processing systems and devices – Circuitry combined with specific type microphone or loudspeaker – With electrostatic microphone

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Details

381 68, 381 69, 179107R, 179111E, H04M 103

Patent

active

045091935

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.

REFERENCES:
patent: 3300585 (1967-01-01), Reedyk et al.
patent: 3816671 (1974-06-01), Fraim
patent: 3862367 (1975-01-01), Kono
patent: 3875433 (1975-04-01), Uchikawa
patent: 3942029 (1976-03-01), Kawakami
patent: 4063050 (1977-12-01), Carlson
patent: 4068090 (1978-01-01), Komatsu
patent: 4207442 (1980-06-01), Freeman

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