Ultra low current amplifier

Details Ultra low current amplifier Ultra low current amplifier

1975-12-09

1976-11-30

Mullins, James B.

Amplifiers

Signal feedback

Combined with control of bias voltage of signal amplifier

330 13, 330 25, 330 28, H04R 2500, H03F 3183

Patent

active

039951146

ABSTRACT:
An amplifier circuit for a hearing aid, for producing moderately high gain and output sound pressure levels, with extremely low current drain on the battery. The output stage uses a pair of complementary transistors, with each providing a dynamic load for the other, and a low impedence receiver. Negative feedback may be taken from an output blocking capacitor to provide sharp low frequency roll-off where necessary for certain types of hearing loss. The circuit can provide an acoustic gain of more than 38 db, at an output sound pressure level of 116 db or more, depending on the load impedence, on only 0.150 milliamperes of current from a 1.35 volt battery.

REFERENCES:
patent: 2855468 (1958-10-01), Lohman
patent: 3365545 (1968-01-01), Petrie
patent: 3529252 (1970-09-01), Long
patent: 3649925 (1972-03-01), Besser
patent: 3764929 (1973-10-01), Alves
patent: 3781491 (1973-12-01), Biondi et al.
patent: 3784750 (1974-01-01), Stearns et al.

Affiliated with

Also associated with

Rating

Ultra low current amplifier does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Ultra low current amplifier, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Ultra low current amplifier will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1056342