Dual 40W Audio Power Amplifier with Mute

The stereo audio amplifier project shown here is capable of delivering typically 40W per channel continuous average output power into an 8Ω load with less than 0.1% (THD+N). The project is built using an LM4766 chip from Texas Instruments, The performance of the LM4766, utilizing its Self-Peak Instantaneous Temperature (°Ke) (Spike) Protection Circuitry, places it in a class above discrete and hybrid amplifiers by providing an inherently, dynamically protected Safe Operating Area (SOA).

Key Features

• Power Supply +/-30V DC for 40W Output, Power Supply Range Dual 10V to 32V DC (+/-10V to +/-32V) @ 4Amps
• Load 8 Ohms Speaker
• Quiet Fade-In/Out Mute Switch
• THD+N at 1kHz at 2 x 40W Continuous Average Output Power Into 8Ω 0.1% (Max)
• Frequency Response 20 to 20Khz
• Input Level Signal 1V Peak to Peak
• Input Impedance 47K Ohms
• Gain 21
• PCB Dimensions 93.35 x 81.92 mm