Simple 100W Power Amplifier using TIP142 NPN and TIP147 PNP transistors + PCB

Fig 1 - PCB 100W Power Amplifier - TIP142 and TIP147 Transistors

This is a low complexity amplifier, which can be easily assembled by anyone who has basic knowledge in electronics.

This amplifier works with a Class B output stage with a complementary output pair formed by the TIP142 and TIP147 Darlington Transistors.

Operation

The input stage, is formed by a differential pair Q1 and Q2, which are two PNPs A733 transistors, the Q1 transistor receive the input signal for amplification, and Q2 receives the Feedback signal.

Thus assembling a signal loop making with the differential amplifier to control the signal giving stability to the amplifier and avoiding distortion in the circuit.

The second stage consists of a TIP41 transistor, which functions as a Drive, which receives the signal from the differential pair and amplifies it to delivery a sufficient current at the base of the output transistors.

Diodes D1, D2 and D3 determine the base polarization voltage in the transistors.

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This amplifier has an output power of approximately 100 watts, to get this output power will depend on the Power Supply voltage, with a supply voltage of + 50V / - 50V, with a current of 3A.

In our tests, it was possible to get a little more than 100W. The schematic diagram circuit, is in Figure 2 below, it is a very simple circuit to build, with few external components.

However, be careful, it works with a total voltage of 90V, be careful not to change any component polarity, don't short the amplifier circuit.

Fig 2 - Schematic Simple 100W Power Amplifier with  TIP142 NPN and TIP147 PNP transistors

Power supply

The power supply for this circuit amplifier is symmetrical, in our tests a Transformer with a +36V 0V -36V AC, center-tape was used, with a current 3 Amperes, after the CA voltage goes through the rectification, it will average 50V DC.

Components List

• Semiconductor 
• Q1, Q2 .... A733 - PNP transistor 
• Q3 ........... TIP41C - NPN transistor
• Q4 ........... TIP142 - NPN power transistor 
• Q5 ............TIP147 - PNP power transistor 
• D1, D2 .... 1N4007 - Diode 
  
  
• Resistors 
• R1, R2 ..... 22K ohms - 1/8W - Resistor  - (red, red, orange, gold)
• R3 ........... 1K5 ohms - 1/8W - Resistor  - (brown, green, red, gold)
• R4 ........... 220 ohms - 1/8W - Resistor  - (red, red, brown, gold)
• R5 ........... 27K ohms - 1/8W - Resistor  - (red, violet, orange, gold)
• R6 ........... 27 ohms - 1/8W - Resistor  - (red, violet, black, gold)
• R7, R8 .... 3K3 ohms - 1W - Resistor  - (orange, orange, red, gold)
• R9, R10 ... 022 ohms - 3W - Resistor  - (red, red, gold, silver)
  
  
• Capacitors
• C1 .......... 2.2uF - 25V - Electrolytic capacitor 
• C2 .......... 100uF - 63V - Electrolytic capacitor 
• C3 .......... 10uF - 63V - Electrolytic capacitor
  
  
• Miscellaneous 
• P1, P2 ..... Block 5mm 2 Pin weldable terminal Connector
• P3 ........... Block 5mm 3 Pin weldable terminal Connector
• Others .... Printed Circuit Board, Wires, Solders, Etc.
  
  

We are offering the PCI - Printed Circuit Board, in GERBER, PDF and PNG files, for you who want to do the most optimized assembly, either at home.

If you prefer in a company that develops the board, you can is downloading and make the files in the Download option below.

Files to download, Direct Link:

Click on the link beside: GERBER, PDF and PNG files

If you have any questions, suggestions or corrections, please leave them in the comments and we will answer them soon.

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