Do you know what parts a professional stage power amplifier has?

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GUANGZHOU XINBAOSHENG AUDIO EQUIPMENT COMPANY LIMITED

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1. Input interface

XLR interface: used to receive balanced signals, usually used to connect microphones or other professional audio equipment. Has good anti-interference ability.

TRS interface: balanced audio input, can be used to connect musical instruments or audio equipment, with triode connector.

RCA interface: usually used to connect unbalanced audio equipment, such as consumer-grade CD players.

2. Preamplifier

Operational amplifier (Op-Amp): used to increase the gain of weak signals (such as from microphones or instruments) and increase signal strength. Low-noise types (such as NE5532, OPA2134, etc.) are usually used.

Filter circuit: can contain high-pass and low-pass filters to remove unnecessary frequencies.

3. ADC/DAC (Analog-to-Digital Converter/Digital-to-Analog Converter)

ADC: In some designs, the input analog signal is converted to a digital signal for subsequent digital processing.

DAC: After digital processing, the signal is converted back to an analog signal to drive the speaker.

4. Power amplifier section

Power transistor:

MOSFET (field effect transistor): high efficiency, fast switching response, suitable for high frequency applications, capable of handling high current.

IGBT (insulated gate bipolar transistor): usually used for higher power applications, with superior voltage control capabilities.

Drive circuit:

PWM (pulse width modulation) module: used to control the switching of power transistors to ensure efficient conversion and minimum distortion.

5. Output transformer (in some designs)

Output transformer: may be used in the design to match the output impedance of the power amplifier with the input impedance of the speaker to improve energy transfer efficiency.

6. Output interface

Speakon interface: designed for audio equipment, providing safe and reliable connection, commonly used in professional audio systems.

Banana plug: commonly used to connect speakers, can be inserted into the output of the speaker, simple to handle, often used in education and laboratory environments.

7. Power supply section

Switching power supply module: efficient conversion of AC to DC, often used in TD class amplifiers, because they can provide the necessary power output while maintaining a small size.

Filter capacitor: usually use large capacity low ESR capacitors to reduce the high frequency noise of the power supply and provide stable voltage.

8. Heatsink

Heat sink: Many amplifier designs include aluminum heat sinks to increase surface area for efficient heat dissipation.

Fans: In high power output situations, electric fans provide additional air circulation to help dissipate heat in a timely manner.

9. Protection circuits

Short circuit protection: Once a short circuit condition is detected, the output is automatically cut off to protect the amplifier and speakers.

Overload protection: Gain is reduced or output is shut down when the power is too high to avoid damage.

Temperature monitoring: Temperature sensors can monitor the internal temperature of the amplifier and automatically adjust the power or shut down when overheating.

10. Indicator lights and control panel

LED indicator lights: used to indicate power status, signal input status, protection status, etc.

Control knobs: usually include gain control, EQ adjustment and selector switches, etc., which can be used to adjust audio parameters.

11. Housing

Aluminum alloy housing: light and strong, can prevent electromagnetic interference (EMI) and mechanical damage, while providing good heat dissipation.

Internal layout: Reasonable layout of circuit boards and components to reduce signal interference and improve maintainability.