HI-FI Audio Amplifier 60W

This amplifier features a high-quality circuit equipped with complete short circuit protection and exhibits very low total harmonic distortion (T.H.D.) across a full range of frequencies. It requires a symmetrical power supply of ±40V. The output power transistors are configured in a Darlington arrangement and both require heatsinks. The amplifier can deliver 60 watts at 8 ohms or 80 watts at 4 ohms.

Characteristics:
- Power Output: 60 watts at 8 ohms or 80 watts at 4 ohms
- Power Supply: ±40 Volts
- Current Consumption: 50 mA - 4 A
- Frequency Range: 5 - 35,000 Hz
- Sensitivity: 0 - 1 dBm (0.707 - 1.5V)
- Amplification: 24
- Total Harmonic Distortion (T.H.D.):
- 0.05% at 1 kHz
- 0.08% at 10 kHz
- 0.1% at 20 kHz

Parts:
- R1 = 27 kΩ
- R2, R6 = 470 Ω
- R3 = 10 kΩ
- R4 = 47 kΩ
- R5, R12, R18 = 1 kΩ
- R7 = 12 Ω
- R8, R9, R10, R14, R17, R19, R20 = 100 Ω
- R11 = 3.9 kΩ
- R13 = 180 Ω
- R15, R16 = 0.15 Ω
- R21, R22 = 470 Ω
- P = 4.7 kΩ
- D1-D6 = 1N4148
- C1, C4, C6 = 100 µF/63V
- C2 = 22 µF/63V
- C3 = 4.7 µF/25V
- C5 = 220 µF/16V
- C7 = 330 pF
- TR1 = 2N2219
- TR2, TR3, TR7 = 2N2905
- TR4, TR6 = BD237
- TR5 = BD238
- TR8, TR9 = 2N3055

The amplifier circuit is designed with a robust architecture that ensures reliable performance while minimizing distortion. The use of a symmetrical power supply of ±40V is critical for maintaining the linearity of the amplifier across its operational range. The Darlington configuration of the output transistors enhances the current gain, allowing for higher power output without compromising on efficiency.

The choice of components is crucial in achieving the specified performance characteristics. Resistors are selected for their tolerance and thermal stability, ensuring consistent operation under varying load conditions. The capacitors used in the circuit are chosen for their voltage ratings and capacitance values to handle the required frequency response. The inclusion of diodes, such as the 1N4148, provides protection against reverse polarity and transient voltages, enhancing the durability of the amplifier.

Heat dissipation is managed through the use of heatsinks attached to the output transistors, which is essential for preventing thermal overload during continuous operation. The overall design prioritizes low T.H.D. values, particularly at critical frequencies, which is essential for high-fidelity audio applications. The amplifier's sensitivity and amplification factors are optimized to ensure compatibility with a wide range of input signals, making it versatile for various audio sources.

This amplifier is suitable for applications requiring high power output and fidelity, such as in home audio systems or professional sound reinforcement setups. Its design reflects a balance between performance, reliability, and ease of integration into existing audio systems.This amplifier has a high quality circuit that includes full sort circuit protection and very low T.H.D. at full range of frequency. It needs simmetrical power supply +-40V. The power transistors at the output are connected as DARLINGTON and both needs heatsinks. The power can reach 60 watts at 8 ohms or 80 Watts at 4 ohms.. Characteristics: power= 60 watts at 8 ohms or 80 Watts at 4 ohms power supply=+-40 Volts current concumption= 50mA - 4A Frequency range: 5-35000 Hz Sencitivity= 0-1 dbm (0.707-1.5V) Amplification= 24 T.H.D. = 0.05 at 1Khz 0.08 at 10 Khz 0.1 at 20 Khz ---------------------------------- Parts: R1=27K R2,6=470 R3=10K R4=47K R5,12,18=1K R7=12 R8,9,10,14,17,19,20=100 R11=3,9K R13=180 R15,16=0,15 R21,22=470 P=4,7K D1-D6=1N4148 C1,4,6=100uF/63V C2=22uF/63V C3=4,7uF/25V C5=220uF/16V C7=330pf TR1=2N2219 TR2,3,7=2N2905 TR4,6=BD237 TR5=BD238 TR8,9=2N3055 ------------------------------