Hearing-aid made of TDA2822M

A hearing aid, emitter follower technology, applied in hearing aids, sensors, transducer circuits, etc., can solve problems such as small crossover distortion, and achieve the effects of small crossover distortion, small quiescent current, and fewer peripheral components.

Inactive Publication Date: 2011-07-13
黄勇
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The hearing aid has the characteristics of simple circuit structure, few peripheral components, small crossover distortion, good sound quality, wide operating voltage range, small quiescent current and low power consumption, and output power that can meet the requirements of hearing-impaired people. Hearing aids that solve or make up for some of the shortcomings of some hearing aids on the market

Method used

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  • Hearing-aid made of TDA2822M
  • Hearing-aid made of TDA2822M

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Embodiment Construction

[0013] The present invention can be realized by implementing the circuit working principle diagram of the hearing aid made of TDA2822M shown in the accompanying drawings, the description of the accompanying drawings and the technical requirements of the components described below.

[0014] Selection of components and their technical parameters

[0015] IC1 is an integrated power amplifier circuit, the model is TDA2822, which has two packaging forms, TDA2822 is a 16-pin dual-in-line packaging structure, and TDA2822M is an 8-pin dual-in-line packaging structure, and the internal equivalent circuits of the two are the same. The TDA2822M integrated circuit is selected in the embodiment; their difference is that the operating voltage range of TDA2822M is all from 3 to 15V, while the highest operating voltage of TDA2822 integrated circuit is only 8V;

[0016] Silicon transistor BG1 chooses 2SC9012 and other models, silicon transistor BG2 chooses 2SC9014 and other models, and the amp...

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Abstract

The invention belongs to the technical field of electronics and audio amplification, and relates to a hearing-aid made of a TDA2822 (Tunnel Diode Amplifier). The hearing-aid comprises a direct current (DC) power supply, a power supply filter circuit, a constant current source and pickup circuit, an emitter follower, an audio signal regulating circuit and an integrated power amplification circuit. The hearing-aid is characterized in that the constant current source and pickup circuit is used as a power supply of a capacitor microphone (MIC), the emitter follower is used as a high-resistance amplification circuit, and the type of the integrated power amplification circuit (IC1) in a BTL (Bridge-Tied-load) mode application circuit is TDA2822M. The hearing-aid provided by the invention is formed by combining discrete components and the integrated power amplification circuit. The hearing-aid has the characteristics of simple circuit structure, fewer peripheral elements, little cross distortion, good tone quality, wide working voltage range, less static current and electricity consumption, output power capable of meeting the requirements on people with poor hearing, and the like, and is a hearing-aid attractive in price and quality, thereby solving or overcoming the problems of partial defects existing in some hearing-aids on the market, and the like.

Description

technical field [0001] The invention belongs to the technical field of electronics and audio frequency amplification, and relates to a hearing aid made of TDA2822M. Background technique [0002] Generally, hearing aids are designed and manufactured with dedicated integrated power amplifier circuits. There are many integrated circuit peripheral components in the circuit, and the circuit structure is relatively complicated. The TDA2822M integrated power amplifier circuit used by the hearing aid made by TDA2822M according to the present invention is commonly used in audio equipment such as Walkman, portable micro-recorder, computer audio for power amplification, and DVD; the integrated circuit has high integration, There are few peripheral components, and the working voltage range is wide, and it can still work normally when the voltage is lower than 1.8V. It has the characteristics of small static current, low power consumption, small crossover distortion and good sound qualit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04R25/00H04R3/00
Inventor 黄勇
Owner 黄勇
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