LM391 audio amplifier( 40W - 60W )

Using the LM391 audio power driver circuit we can build a high power audio amplifier .
LM391 audio power driver is designed to drive high power external transistors in 10 to 100 watts power amplifiers designs .
This LM391 audio amplifier circuit from this schematic can deliver 40W ( watts ) on a 8 ohms load impedance or 60w on a 4 ohms load impedance .
The type of the output transistors and the driver transistors must be like in the table presented bellow .

The schottky diode and resistor (100 ohms value) marked with + are used for additional protection of the driver .
The power supply needed for this audio amplifier circuit must be between 27 and 39 volts ( split power supply.