Amplifier Circuit DiagramsAudio Circuit Diagrams

2 x 60 W audio amplifier schematic circuit diagram


The circuit diagram shown here is of a 2 x 60 Watt stereo amplifier based on the LM4780 from National Semiconductors. LM4780 is a superb audio amplifier IC capable of delivering 60W Rms power output / channel into 8 ohm speakers. The LM4780 has very low total harmonic distortion (less than 0.5% at full output) and has a power supply rejection ration (PSRR) of 85 dB. The IC requires very few external components and has a built in mute facility. The LM4780 is completely protected using their trademark SPiKe technology and has a signal to noise ratio greater than 97dB. The circuit given here is well suitable for applications like components stereos, self powered speakers, home theatre systems, compact stereos etc.

Circuit diagram

2 x 60 W audio amplifier schematic circuit diagram

LM4780 pin configuration

LM4780 pin configuration


  • The circuit must be assembled on a good quality PCB.
  • The amplifier can be powered using a 35V DC dual supply.
  • K1 and K2 must be 8 ohm, 60W speakers.
  • An adequately sized heat sink must be fitted to the IC.

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