Internal and external double-magnetic loundspeaker with pickup-free headphone for cell phone and amplifying and controlling circuit

无线电话用内外双磁式听筒免提扬声器及功放控制电路

Abstract

A receiver hand-free loudspeaker arranged with an inner magnet and an outer magnet and a power amplifier and control circuit for radiotelephones is provided which consists of a loudspeaker and an audio control switch thereof specially designed in the utility model, a capacitance and an audio output capacitor, a diode, a power amplifier tube and collector, emitter, base resistors thereof, an audio signal input control switch and an audio signal input capacitance which are electrically connected in subsequence; the utility model can be arbitrarily switched to a receiver mode or a loudspeaker mode conveniently, and has advantages of ultra-thin, ultra-light, supermicrominiaturizational, high sensitivity, high power amplifier, high output power, graceful sound quality and low distortion. The utility model provides great convenience for realizing and satisfying product lightening, thinning and miniaturization, and many service performance requirements such as consumers#GB001 arbitrary free choices between the receiver talking mode and the loudspeaker talking mode according to their hobbies momentarily, wrong inclinations such as increasing radiation and harms to the users by using an earphone and troubles and inconveniences thereof can be avoided. The utility model can be widely used in light, thin and small-sized high sound quality electronic field and products thereof such as portable computers and vocal electronic dictionaries.
一种无线电话用内外双磁式听筒免提扬声器及功放控制电路,由本实用新型特别设计的扬声器及其音频控制开关,隔直和音频输出电容器,二极管,功放管及其集电极、发射极和基极电阻器,音频信号输入控制开关和音频信号输入电容器顺序电连接组成;能方便自如任意切换为听筒或扬声器方式,超薄、超轻、超小型化及高灵敏度、高功效和高输出功率与音质优美、失真小等优点,为实现和满足产品轻薄小型化及消费者随时需要与爱好而任意自由选择听筒或扬声器通话方式等诸多使用性能需求方面提供了极大方便,并避免因使用耳机增加辐射及对使用者的危害等错误倾向及使用耳机的麻烦和不方便,在笔记本电脑、发声电子词典等轻薄小型高音质电子领域及其产品中也可广泛应用。

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