Audio Amplifier 80 W
80W Audio Power Amplifier (LM3875)
This audio amplifier delivers up to 80 W of output power using the LM3875 power amplifier IC. It provides high-quality audio with low distortion, suitable for medium-power speaker applications.
Power Supply
The amplifier requires a 25V DC power supply to operate correctly. A well-regulated and filtered supply ensures stable operation and minimizes hum or noise.
Construction Notes
- The LM3875 IC must be mounted on a proper heatsink to dissipate heat at high output power.
- Keep input and feedback wiring short and separate from the high-current output to prevent oscillations.
- Use quality electrolytic capacitors for power supply filtering to ensure low ripple voltage.
- Observe correct polarity when connecting the power supply and speaker outputs.
Key Features
- High-fidelity audio output
- Up to 80 W RMS into 8 Ω speakers
- Requires a single 25V DC power supply
- Low component count for simple construction
- LM3875 IC requires heatsinking for thermal stability
Audio power amp 80W, the ic LM3875 need heatsink