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本文介绍一种价格便宜、体积小、性能好且简单易制的功率放大器。 原理如图1所示。音频信号通过输入端进入电路。经电容C1输给TDA2030A的1脚(同相输入端),由TDA2030A进行功率放大,并推动功放管MJ2955和2N3055工作,从而大大提高对音频信号的功率输出。但,若TDA2030A的电源电流小于0.6A时,电阻R4、R5产生的压降不足以使两只功放管导
This article describes a cheap, small size, good performance and easy-to-use power amplifier. The principle is shown in Figure 1. The audio signal enters the circuit through the input. Capacitor C1 to TDA2030A 1 foot (noninverting input), by the TDA2030A power amplifier, and promote the power amplifier tube MJ2955 and 2N3055 work, thereby greatly improving the audio signal power output. However, if the power supply current of TDA2030A is less than 0.6A, the voltage drop caused by resistors R4 and R5 is not enough to make the two power amplifier tubes guide