2x11W Stereo Audio Amplifier with LM4755

Here the circuit diagram of 2x11W stereo audio amplifier build based on single power chip LM4755 manufactured by National Semiconductor.

The LM4755 is a stereo audio amplifier able to deliver 11W per channel of constant typical output power to a 4Ω load or 7W per channel into 8Ω applying a single 24V supply at 10% THD+N. The internal mute circuit and pre-set gain resistors present for a very economical design solution.


Power output specifications at both 20V and 24V supplies and minimal external component count offer high value to consumer electronic manufacturers for stereo television and compact stereo devices. The LM4755 is especially intended for single supply operation.

LM4755 Features:

• Drives 4Ω and 8Ω loads
• Integrated mute function
• Internal Gain Resistors
• Minimal external components needed
• Single supply operation
• Internal current limiting and thermal protection
• Compact 9-lead TO-220 package
• Wide supply range 9V - 40V

Download LM4755 datasheet for your project reference.