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In this application, we are building a gaincard like amplifier. This application type is named gainclone in the audio world. To take a satisfactory audio response, we are adding a Linkwitz equaliser to the feedback line and adding bass compensation also.
We are using LM3886 which is the revised version of its brother LM3875.Briefly features of LM3886 are;
Maximum Output Power: 68W RMS - 108W Peak
THD: %0.03 at 60W
SNR: 110dB at 60 W - 92.5dB at 1W
PSRR: 120dB
Protection Circuitries: DC/AC Short circuit protection and thermal protection
Output Class: Conjugate AB-A
These are the parameters that we are interested 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.
http://www.circuit-projects.com/audio-circuits/lm3886-gainclone-2x68-watt-full-amplifier-project.html
