LM3886 Gainclone 2x 68W Full Amplifier Project

These are the parameters that we are intereted in. Honestly this values are much more better than many of HI-FI amplifiers sold in the market. Especially it is hard to find 110dB signal to noise ratio. And another property is, when there is no input, this amplifier is quite like a dead. It is nearly impossible to hear any noise when you stick your ear to the speakers.

The circuit below is the recommended design by National Semiconductors engineers. As you can see it is a plain and applicable circuit. Essentially we did any change to the input line hence we didn’t add extra noise. Rin is input level potentiometer, Rb is current limiter potentiometer and Rf1-Ri are gain resistors. In this application, gain is 20k/1k=20 (26.4dB). 22uF capacitor provides the gain curve start from about 7 Hz so it filters unwanted low frequencies.

Source:http://www.circuit-projects.com/lm3886-gainclone-2×68-watt-full-amplifier-project.html
Thank you.

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