CAB-USB-3.5MM-VC 8403 Cable Audio Amplifier Class D, 5V 2*3W, 3.5mm Jack with Volume Control

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US$7.23
CAB-USB-3.5MM-VC
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CAB-USB-3.5MM-VC 8403 Cable Audio Amplifier Class D, 5V 2*3W, 3.5mm Jack with Volume Control.

Specifications:
Power supply voltage: DC5V,
Frequency response: 150Hz~20KHz
Efficiency: >90%, signal-to-noise ratio: 90DB
Output impedance: 4~8 ohm
Output power: 3W*2
Cable length: 1.2 meters
Audio Jack: 3.5mm

The 8403 is a digital power amplifier, which is also called a class D power amplifier. Class D amplifiers are different from Class A, B or AB amplifiers. Their working principle is based on switching transistors, which can be completely turned on or completely turned off in a very short time. The two transistors will not turn on at the same time, so little heat is generated. This type of amplifier is extremely efficient (about 90%), which can reach 100% under ideal conditions, compared to 78.5% for class AB amplifiers. On the other hand, the switching mode also increases the distortion of the output signal. The circuit of the class D amplifier is divided into three stages: input switch stage, power amplifier stage and output filter stage. Class D amplifiers can use pulse-width modulation (PWM) mode when operating in the on-off state. Use PWM to convert the audio input signal into a high-frequency switching signal and compare the audio signal with a high-frequency triangle wave through a comparator. When the voltage at the inverting terminal is higher than the voltage at the non-inverting terminal, the output is low; when the inverting terminal When the voltage is lower than the voltage of the non-inverting terminal, the output is high.

Special note: blue and red wires are connected to the positive pole; if there is no blue, white wire is the positive pole

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