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Build Your 2-Channel Headphone Amplifier Circuit Diagram
Circuit Diagram:
Components:
- P1 = 22K Ohm resistor
- R1 = 560 Ohm resistor
- R2 = 10K Ohm resistor
- R3 = 10K Ohm resistor
- R4 = 12K Ohm resistor
- R5 = 2.2 Ohm resistor
- R6 = 2.2 Ohm resistor
- R7 = 22 Ohm - 1/2W resistor
- Q1 = BC337 transistor
- Q2 = BC327 transistor
- Q3 = BC337 transistor
- Q4 = BC327 transistor
- C1 = 1µF - 63V capacitor
- C2 = 100µF - 25V capacitor
- C3 = 100µF - 25V capacitor
- C4 = 100µF - 25V capacitor
- C5 = 22pF - 63V capacitor
- C6 = 22µF - 25V capacitor
- IC1 = NE5532 integrated circuit
- J1 = RCA audio input socket
Notes:
- This circuit can be seamlessly linked to CD players, tuners, and tape recorders.
- It has undergone testing with various headphone models exhibiting differing impedances: 32, 100, 245, 300, 600 & 2000 Ohm.
- Older 8 Ohm impedance headphones may be driven, however, these outdated devices are not encouraged.
- The schematic depicts the left channel along with the associated power supply, which is shared between both channels.
- The numbers enclosed in parentheses denote the pin connections for IC1 in the right channel.
- Proper grounding is crucial for minimizing hum and mitigating ground loops. Connections should be made to the same point for J1, P1, C2, C3 & C4. Subsequently, independently connect the input and output grounds to the power supply ground.
More about components
The NE5532 integrated circuit, designated as IC1, is a versatile three-terminal JFET input audio operational amplifier. This device is renowned for its low noise, high input impedance, and excellent linearity, making it ideal for precision audio applications. Its wide operating voltage range allows for flexibility in power supply choices. The NE5532 offers superior performance compared to earlier audio op-amps, contributing to a cleaner and more detailed sound reproduction.
Transistors
The BC337 and BC327 transistors are NPN bipolar junction transistors commonly used in low-power audio applications. The BC337 is a general-purpose transistor, offering good current gain and relatively simple biasing. The BC327, also a general-purpose transistor, is often chosen for its ease of use and availability. These transistors are commonly utilized in amplifier stages due to their straightforward characteristics and readily obtainable specifications.