LM4780 audio amplifier circuit

Using this circuit diagram you can construct an very simple and high efficiency audio amplifier circuit . This schematic circuit is based on the LM4780 integrated circuit manufactured by National Semiconductor . This stereo audio amplifier circuit is capable of typically delivering 60W per channel of continuous average output power into an 8 ohms load with less than 0.5% THD+N from 20Hz - 20kHz.
The LM4780 is fully protected utilizing National's Self Peak Instantaneous Temperature (°Ke) (SPiKeTM) protection circuitry.

SPiKe provides a dynamically optimized Safe Operating Area (SOA). SPiKe protection completely safeguards the LM4780's outputs against over-voltage, under-voltage, overloads, shorts to the supplies or GND, thermal runaway and instantaneous temperature peaks.
Each amplifier of the LM4780 has an independent smooth transition fade-in/out mute.
The LM4780 power amplifier can be used with 4, 6 and 8 ohms load and can be easily configured for bridge or parallel operation for 120W mono solutions .
This audio amp is delivered in a TO-220-27 lead package and can be very easy configured ( using just few external common components ) to provide high quality audio power .
This circuit supports a wide range input voltage from 20 volts up to 84 volts , but the recommended voltages for this circuit are : 25V for RL = 4 ohms ,30V for RL = 6ohms, 35V for 8 ohms .

Very important to know is that for this circuit you’ll need a dual voltage power supply ( for example : if you use a 4 ohms load you will need a +25 and -25 volts power supply).