This simple mosfet power audio amplifier circuit, with TL071C and 2 mosfet power amplifiers can deliver up to 45W on 8 ohm.
This schematic is based on Siliconix application and is based on variations of voltage on the 2 resistors serial inserted on the voltage supplier of the operational amplifier driver.
The MosFet transistor must be mounted on a heatsink at least 1K/W.
Amplifier efficiency is 70%, distortions at cut frequency were at most 0.2% at 20Hz on 8ohm and 10W. With a power supply of +- 30V the mosfet audio amplifier can deliver 45W on 8 ohm and 70w on 4 ohm. Remember that this audio amplifier is not protected on shortcircuits so everytime you switch on check to see if the speaker is connected.
This schematic is based on Siliconix application and is based on variations of voltage on the 2 resistors serial inserted on the voltage supplier of the operational amplifier driver.
The MosFet transistor must be mounted on a heatsink at least 1K/W.
Amplifier efficiency is 70%, distortions at cut frequency were at most 0.2% at 20Hz on 8ohm and 10W. With a power supply of +- 30V the mosfet audio amplifier can deliver 45W on 8 ohm and 70w on 4 ohm. Remember that this audio amplifier is not protected on shortcircuits so everytime you switch on check to see if the speaker is connected.
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