Powerful 80Watts RMS | Power Amplifier Project |

Download the PCB & Schematic of this project by clicking this link.

Required Components
Transistors - BC558 X 2 , TIP41 X 1 , TIP 142 X 1 , TIP 147 X 1
Resistors - 3.3K 1Watt X 2 , 22K 1/4W X 2, 27K 1/4W X 1 , 220Ohms 1/4W X 1 , 10K 1/4W X 1 , 1.5K 1/4W X 1 , 0.47OHMS X 5W X 2
Capacitors - 10 UF/50V X 2 , 100UF/50V X 1
Diodes - 1N4007 X 2
Circuit's Description:
This is the cheapest 80 Watts amplifier circuit.
This circuit is based on two Darlington power transistors TIP-142 and TIP-147 ,this circuit can deliver a blasting 80W R.M.S to a 8-Ohms Load & around 150W R.M.S to 4Ohms Load.
Technical Specifications
TIP 147 and 142 are complementary Darlington pair transistors which can handle 5 A current and 100V. The two BC 558 transistors are wired as pre amplifier and TIP 142 ,TIP 147 together with TIP41 is used for driving the speaker.
This circuit can be powered from a +/-45V, 5A dual power supply and the transformer rating should be 25-0-25.
The preamplifier section of this circuit is based around the two BC558 Transistors these two forms a differential amplifier. The use of a differential amplifier in the input stage reduces noise and also provides a means for applying negative feedback. Thus overall performance of the amplifier is improved. Input signal is applied to the base of one of the BC558 transistor through the DC decoupling 10UF / 50V capacitor . Feedback voltage is applied to the base of the other BC558 transistor from the junction of 0.33 ohm resistors through the 22K resistor. A complementary Class AB push-pull stage is built around the transistors TIP142 and TIP147 for driving the loud speaker. Diodes 1N4007 biases the complementary pair and ensures Class AB operation. TIP41 transistor drives the push-pull pair and its base is directly coupled to the collector of the first (INPUT) BC558 Transistor.
Here are some of the important alternatives
BC 558 or BC 557 or BC556
TIP41 or D313
TIP142 or 2SC5200 or 2N3055
TIP147 or 2SA1943
You must try this circuit.Its working great!
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