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LM3886 Gainclone 2×68 Watt Full Amplifier Project

LM3886 Gainclone 2×68 Watt Full Amplifier Project

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.

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