50Wx2 amplifier circuit

Description: The 50W is a two-channel amplifier featuring a preamplifier and tone control based on the LA3160 integrated circuit. Its external components include the input preamplifier, with C1 serving as the input coupling capacitor. The circuit incorporates a high-frequency bypass capacitor to filter out high-frequency interference. C3, along with the resistors R2 and R, forms the negative feedback network and frequency equalization network. C5 acts as the output coupling capacitor for the tone control circuit. Components such as VT1, Rs, Rg, RP1, and RP2 contribute to the tone control functionality. Specifically, Rs, R, R7, and RP1 are part of the bass control network, while R7, R, and RP2 are associated with the treble control network. This configuration exemplifies a negative feedback type tone control circuit, necessitating the selection of high-gain transistors for amplification, with a recommended gain factor exceeding 100. The collector quiescent current of VT1 should be adjusted to between 2 to 3 mA (via R10), and the load resistor R11 should not be too small to avoid compromising the dynamic range, typically set between 6.8 kΩ and 12 kΩ. The power amplifier circuit adheres to the specifications of a standard application circuit, operating at a supply voltage of 32V and capable of delivering up to 50W of output power. The LA3160 is a two-channel preamplifier integrated circuit characterized by low noise and straightforward peripheral circuitry. Its typical supply voltage is Vc 9V, with a load impedance of 600 Ω, providing an open-loop voltage gain of 80 dB, a harmonic distortion of 0.1%, and a quiescent current of 4 mA, along with an input impedance of 100 kΩ. The output voltage exhibits a crosstalk of 1.8 V at 65 dB, while the noise voltage at the input is noted to be 1.25 µV. The LA3160 is versatile and can be directly substituted with other large integrated circuits such as I3A328 and VPc1032.

The 50W two-channel amplifier circuit is designed to provide high-quality audio amplification with enhanced tone control capabilities. The use of the LA3160 integrated circuit as the core preamplifier ensures low noise operation, which is critical for maintaining audio fidelity. The input coupling capacitor (C1) is essential for blocking any DC offset from the input signal, allowing only the AC audio signal to pass through to the amplifier stages.

The high-frequency bypass capacitor included in the design serves to mitigate unwanted high-frequency noise, ensuring that the audio signal remains clean and free from interference. The negative feedback network, composed of C3 and resistors R2 and R, plays a vital role in stabilizing the amplifier's gain and improving linearity, which is crucial for high-fidelity audio applications.

The tone control circuit, which allows for adjustments in bass and treble, is implemented using a combination of resistors and capacitors that form dedicated networks for each frequency range. This flexibility enables users to tailor the sound output to their preferences, enhancing the overall listening experience.

To achieve optimal performance, the selection of transistors for the amplification stage is critical. The recommendation for a gain factor greater than 100 ensures that the amplifier can adequately drive the output stage without distortion. The quiescent current adjustment for the collector of VT1 is also crucial, as it directly affects the amplifier's thermal stability and dynamic range.

The design adheres to standard power amplifier circuit requirements, utilizing a 32V power supply to achieve a maximum output power of 50W. This output capability makes the amplifier suitable for a range of audio applications, from home audio systems to professional sound reinforcement.

In summary, the 50W two-channel amplifier with its integrated LA3160 preamplifier is a robust solution for high-quality audio amplification, featuring advanced tone control and low noise operation, making it suitable for various audio applications.50w is a two-channel amplifier with a preamp and tone control o LA3160 its outer circumference elements constituting the input preamplifier oC1 the input coupling capacitor, th e island is a high frequency bypass capacitor to filter out high frequency interference. C3, Rt negative feedback network, R2, R R constitute frequency equalization network. C5 is the output coupling capacitor o tone control circuit VTl and Rs ~ Rg, G ~ G, RPl, RP2 and other components. Wherein Rs, R, R, R7, RPi bass control network; R7, R, Island and RPz to treble control network. This is a typical negative feedback type tone control circuit, since the circuit has large attenuation of the signal, and thus a need for transistors VTi, amplification should be selected higher multiple tubes, LU should be greater than 100, to increase the gain of the stage.

VTi collector quiescent current should be adjusted to 2 ~ 3mA, (adjusted Rio), load resistor R1 l is not easy too small, so as not to affect the dynamic range should generally take 6.8 ~ 12kflo power amplifier circuit part is completely in accordance with the requirements of the typical application circuit. Using 32V supply voltage, each output power up to 50w. LA3160. Is a two-channel preamplifier integrated circuit, its main feature is the low noise, simple peripheral circuits.

Its a typical supply voltage Vc 9Vo when the load impedance 600fl, open-loop voltage gain of 80dB, harmonic distortion of 0.1% o quiescent current of 4mA, input impedance is 100kn. Output voltage is a crosstalk 1.8Vo 65d3, off close to the noise voltage input is 1, 25pLVoLA3160 versatility strong, I3A328 and vPC1032 etc.

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