20 watt amplifier with LM1875
The described audio amplifier utilizes the LM1875 integrated circuit, which is a high-performance audio amplifier capable of delivering 20 watts of output power into a 4-ohm load. The amplifier operates from a power supply rated at 48 VDC, providing sufficient headroom for high-quality audio reproduction.
The circuit is designed to achieve very low total harmonic distortion (THD) of 0.015%, ensuring that the audio output remains faithful to the original signal, with minimal coloration. The design incorporates features that enhance performance, such as good channel separation, which allows for a more defined stereo image, and effective ripple rejection, ensuring that power supply fluctuations do not adversely affect audio quality.
For protection purposes, the LM1875 IC includes built-in thermal and short circuit protections, which safeguard the amplifier from damage due to overheating or excessive current draw. Additionally, internal output protection diodes are included to prevent damage from potential back-emf generated by connected speakers.
The amplifier design features terminal pins for easy input connections, allowing for straightforward integration into various audio systems. A Power Battery Terminal (PBT) is provided for convenient connections to the power supply and speakers, facilitating quick setup and modifications.
An LED indicator is included to signal when the amplifier is powered on, providing a clear visual cue for operation status. To manage heat dissipation, a heatsink is affixed to the LM1875 IC, ensuring that the amplifier can operate efficiently without overheating during prolonged use.
The printed circuit board (PCB) dimensions are compact at 48 mm x 60 mm, making it suitable for a variety of enclosure sizes. The design also includes four mounting holes, each with a diameter of 3.2 mm, allowing for secure installation within a chassis using appropriate nuts and studs. This thoughtful design ensures that the amplifier is both user-friendly and robust, suitable for hobbyists and professionals alike.This is a nice amplifier and very easy to make it. Its an 20W Audio Amplifier based on LM1875 IC. Power supply - 48 VDC Output - 20 W, 4 ? Very low distortion (THD - 0.015%), good channel separation and ripple rejection IC built-in thermal, short circuit protections Internal output protection diodes Terminal pins for connecting input Power Battery Terminal (PBT) for easy power supply and speaker connection Power-On LED indicator Heatsink for IC Four mounting holes of 3.2 mm each with nut and stud PCB dimensions 48 mm x 60 mm 🔗 External reference
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