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TL071 MOSFET Audio Amplifier    g eneral description:       This simple mosfet power audio amplifier circuit, with TL071 and 2 mosfets (IRF9530, IRF530) 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 transistors 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 8 ohm 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 short circuits so every time you switch on check to see if the speaker is connected. MOSFET Audio Amplifier    Circuit diagram:

2 X 22 Watt Stereo Amplifier using IC TDA 1554 Here is the circuit diagram of a powerful and high quality stereo amplifier using IC TDA 1554.The circuit has only very few components.The circuit works best with a 4 Ohm speaker. Notes IC must be connected to a heat sink. A computer cabinet fan can also be used in addition(not necessary).Any way better the cooling better the performance.The circuit roughly draws 6A current at 12 V at full volume.So the power supply must be any thing more than 6A.Up to 18 V can be used ,which gives a bit more power boost.Commonly used is 12 V. Parts List R1 39K 1/4 Watt Resistor C1,C2 10uf 25V Electrolytic Capacitor C3 100uf 25V Electrolytic Capacitor C4 47uf 25V Electrolytic Capacitor C5 0.1uf 25V Ceramic Capacitor C6 2200uf 25V Electrolytic Capacitor U1 TDA1554 Two Channel Audio Amp Chip MIS Heatsink For U1, Binding Posts (For Output), RCA Jacks (For Input) Circuit Diagram .

The HA13155 is four-channel BTL amplifier IC designed for car audio, featuring high output and low distortion, and applicable to digital audio equipment. It provides 33 W output per channel, with a 13.7 V power supply and at Max distortion. Circuit diagram: Datasheet for HA13155: Download