50W amplifier based LM3886TF

Published:2013/3/12 1:16:00 Author:Ecco | Keyword: 50W amplifier | From:SeekIC

This 50W amplifier circuit is designed for quad power stage on computers equipped with sound cards MonsterSound Diamond MX300. With this circuit we get 200W output power with a total harmonic distortion of less than 0.01%. Somewhat classified as High-End Audio. The audio signal from the sound card enters the operational amplifier by pin 10 (non-inverting input). A 1μF capacitor passes only the audio signal, blocking the DC component that may exist. A 10K potentiometer (optional) lets you adjust the input limit. At the output a 20K resistor performs the feedback through the inverting input while a set RL power output coupled to the speaker. This set consists of a coil of 10 to 15 turns of wire 1.5mm on a resistance of 10 ohms / 2 watt. Two electrolytic decouple the power supply and a jumper controls the mute (silence) which is activated by opening the switch. The 100μF capacitor with the 47K resistor act as input delay, avoiding noise when connecting the power.



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