In this 100W power amplifier circuit, the two of LM3886 are paralled to gain more powerful amplifier output. This amplifier can deliver about 50W into a 8-ohm speaker and 100W into a 4-ohm speaker. To make a stereo amplifier, there are should be use 4 pieces of LM3886.

The LM3886 is a high-performance audio power amplifier capable of delivering 68W of continuous average power to a 4O load and 38W into with 0.1% THD+N from 20Hz?20kHz. It can be used for general purpose application such as Component stereo, Compact stereo, Self-powered speakers, Surround-sound amplifiers, High-end stereo TVs etc.

The documentation of this 100W amp project: http://www.shine7.com/audio/pa100.htm
Visit the page to get information about schematic diagram, PCB layout and construction information.

Download the LM3886 datasheet for circuit reference from below link:

LM3886 Datasheet

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Download Datasheet

The LM3886 is a high-performance audio power amplifier capable of delivering 68W of continuous average power to a 4 ohm load and 38W into 8 ohm with 0.1% THD+N from 20Hz-20kHz.

LM3886 Amplifier Specifications:

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

The performance of the LM3886, utilizing its Self Peak Instantaneous Temperature (?Ke) (SPiKe?) protection circuitry, puts it in a class above discrete and hybrid amplifiers by providing an inherently, dynamically protected Safe Operating Area (SOA). SPiKe protection means that these parts are completely safeguarded at the output against overvoltage, undervoltage, overloads, including shorts to the supplies, thermal runaway, and instantaneous temperature peaks.

The LM3886 maintains an excellent signal-to-noise ratio of greater than 92dB with a typical low noise floor of 2.0uV. It exhibits extremely low THD+N values of 0.03% at the rated output into the rated load over the audio spectrum, and provides excellent linearity with an IMD (SMPTE) typical rating of 0.004%.

Download the LM3886 datasheet document:
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