NJW1302G

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NJW1302G is a single-channel, high-efficiency, low-distortion sound amplifier with low external components. It is a widely used bipolar junction transistor (BJT). Based on its external components, its desired application field and working principle are as follows:

Application field

NJW1302G is primarily used for low-frequency audio amplification. It provides up to 65W audio output power and is suitable for a wide range of audio applications such as audio systems, car entertainment systems, and home cinema systems. In addition, its low input current, low voltage drop, and low distortion are among the most significant characteristics that make it suitable for portable audio devices such as smartphones, laptops, and personal audio players.

Working principle

NJW1302G is based on the bipolar junction transistor (BJT), and operates as a "complementary-symmetry pair." This means that the current flow between the collector and emitter is controlled by two transistors in opposite polarities, i.e. a n-type and a p-type. The n-type is the main switching transistor, and the p-type is the "secondary transistor" for stabilizing the current flow between the collector and the emitter. The two transistors are connected as a pair, one with its collector connected to the base of the other and its emitter connected to the collector of the other.

NJW1302G is driven by a single supply rail, whose voltage is either positive or negative, depending on the desired polarity of the audio output. The single supply rail provides the necessary voltage for the transistors to be able to switch on and off. It should be noted that, due to the design of the circuit, the NJW1302G is capable of amplifying both positive and negative audio signals. To achieve this, the drive voltage needs to be able to switch between positive and negative as the polarity of the input signal changes.

In summary, NJW1302G is an efficient and low distortion single-channel sound amplifier. It is based on the classical bipolar junction transistor (BJT) which is driven by a single supply rail. It is suitable for a wide range of audio applications such as car entertainment systems, home cinema systems, and portable audio devices. Its low input current, low voltage drop, and low distortion makes it an ideal choice for audio amplification.

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