LM1875 | Electronic Project Circuits

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25W Hi-Fi Audio Amplifier using ic LM1875

This circuit is the audio amplifier circuit has a very popular one.This is a simple circuit. Small pieces of equipment. And Watt are high.The circuit uses IC number LM1875, which is under the protection circuit IC output or Too short circuit. And a significant distortion as low as 0.015% at a frequency of 1kHz.

This circuit uses positive, negative ground power supply to get the audio signal with both halves of the signal swing, positive and negative halves,The sound that came out crystal clear.Work is. When paying into the audio input. Audio is through R1, R2, C1 and R3 to limit the audio signal appropriately.And limit the noise to the input signal mixed down to the ground.Then sends a signal to noise to the input pin of IC 1.A noninterting pin, amplifier non-return phase.Out of the 4 output pins to access the speakers.The R6 and C4 eliminate noise mixed with the output down to the ground.And another part of the audio output pin 4 of integrated circuit will be fed back into place through R5 to pin 2, which R4 and R5 determines the rate of boost up, can be calculated from R5/R4,will gain equal to 15 times, With a C2 to meet high frequencies better.

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Categories: Power Amplifier Tags: Hi-Fi Audio amplifier, LM1875, Single Chip Amplifier

25W Audio Power Amplifier by LM1875

This audio power amplifier project is based on LM1875 amplifier module from National Semiconductor. It is able to deliver up to 30W of power using an 8 ohm load and dual 30V DC power supplies. It is designed to operate with minimum external components with current limit and thermal shutdown protection features . Other features include high gain, fast slew rate, wide power supply range, large output voltage swing and high current capability.