Electronic enthusiasts or maintenance personnel sometimes need a single-end low-voltage DC power supply and can output high-power portable amplifiers when they go out for advertising or playing music, and the general portable recorders often play very little. Here is a description The portable amplifier circuit with excellent performance may be able to meet your needs. Although the structure of this circuit is simple, it is very practical. It uses battery power supply and strong output power.
Circuit principle:
The circuit principle is shown in the figure, it includes two channels of microphone input and line input. Suzhou part uses the audio power amplifier integrated circuit TDA1519 introduced by Philips. This circuit has a wide working power supply voltage range, high gain, large output power, and distortion. Features such as small size, few peripheral components, and protection functions such as load short circuit, open circuit, and overheating. The excellent performance of TDA1519 determines the superiority of the amplifier. S in the figure is the noise control switch of the amplifier. The rectifier tube 1N5404 is to prevent The storage battery is reversed and burned to set up the integrated circuit. The loudspeaker of the amplifier needs to be no less than 10W in order to give full play to its high power characteristics. The heat sink of the integrated circuit should have sufficient area to ensure normal operation under any conditions.
The circuit of the amplifier is very simple to make, the welding is correct, and it can be used without debugging.
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