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上期介绍了用TDA2822制作的双工有线对讲机。下面介绍的放大器使用TDA2822电路,采用BTL连接方式,构成常用的喊话器和功放电路。喊话器、功率接续器(有源音箱)两用机电原理图如图1所示,本电路既可作小型扩音喊话使用,也可适用于袖珍立体收放机、收音机,作为音频功率放大器用扬声器放音。整个电路采用3节5号电池4.5V供电,其静态电流为6～9mA,输出功率可达1W左右。本电路将TDA2822集成块内部的两个功放级接成桥式电路,称BTL电路。BTL电路的优点是:制作容易,携带使用方便,可减少失真,改善音质,增加输出功率,并使电路大为简化。工作原理
The previous article introduced the use of TDA2822 production of duplex walkie-talkie. The amplifier described below uses the TDA2822 circuit, using a BTL connection, to form a common megaphone and power amplifier circuit. Megaphone, power connector (active speaker) Dual-purpose electromechanical schematic diagram shown in Figure 1, the circuit can be used for both the small public address propaganda, but also for pocket stereo player, radio, as an audio power amplifier Speaker playback. The entire circuit uses 3 AA batteries 4.5V power supply, the quiescent current of 6 ~ 9mA, the output power up to 1W or so. The circuit will be TDA2822 integrated amplifier within the two amplifier stage into a bridge circuit, said the BTL circuit. The advantages of BTL circuits are: easy to make, easy to carry and use, reducing distortion, improving sound quality, increasing output power, and simplifying the circuit. working principle