TDA2050 amplifier stereo 35W-75W

If you would like to build a HI-FI power amplifier project that power output size about 30 watts to 50 watts or 75 watts at 8 ohms loudspeaker, and is high-quality sound and easy to build (not too many components).

We recommend you use TDA2050 class AB OCL amplifier circuits. Below that builds with the integrated circuit, PCB layout and no need for any customization. Parts used in this circuit are easily available in most of the local markets.

TDA2050 datasheet

The TDA2050 is class AB audio amplifier. Its high power capability the TDA2050 is able to provide up to 35W true rms power into speaker 4 ohm load at THD =10%, VS =±18V, f = 1KHz and up to 32W into 8ohm load @THD = 10%, VS = 22V, f = 1KHz.Moreover, the TDA 2050 delivers typically 50W

Pinout TDA2050

The pins connections

schematic diagram inside TDA2050
The schematic diagram

The music power into the 4-ohm load over 1 sec at VS=22.5V, f = 1KHz
May take an interest want to try build already, try out this circuit use voltage Vcc +/- 25V.

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Here is TDA2050 I found on Amazon Read more

TDA2050 I found on Amazon

35 watts TDA2050 Amplifier mono

I know you want to see an example circuit. Here is a simple circuit.

Ready to get started?


35 watts Hi Fi amplifier using TDA2050
Circuit diagram of 35 watts amplifier using TDA2050.

22V Dual Power Supply circuit for 35W amplifier
22V Dual Power Supply circuit for 35W amplifier.

Parts you will need

Electrolytic Capacitors
C1: 0.47 to 22uF 50V
C2: 22uF 35V
C6, C7: 2,200uF 50V

Mylar or Ceramic Capacitors
C3,C4: 0.1uF 50V
C5: 0.15uF or 0.1uF 63V
C8, C9: 0.1uF 63V

0.25W Resistors, 5% tolerance
R1, R3: 47K
R2: 1 to 3.3K or 680 ohms
R4: 1 to 4.7 ohms



50W-75W Stereo power amplifier using TDA2050

We used the TDA2030 to build many power amplifier projects, but they have lower power than 30 watts.

Today, we try to use the TDA2050, which has the output power about 50 watts that shape and easy to use as well.

This project is stereo that easy to builds can adjust volume, tone and balanced sound.

First of all, we look at the circuit diagram below.
This circuit with a high current so takes low voltage 25V similar the normal 30 watts amplifier.

40W + 40W Stereo Power Amplifier using TDA2050
Figure 1: the 35W + 35W stereo power amplifier circuit using TDA2050

We should use the 25V CT -25V high current power supply circuit with RFI filter system. Which have 4 x 2,200uF 50V are connected together in parallel.

25V Dual power supply circuit
Figure 2: the 25V CT -25V Dual power supply of this projects

We can boost up power output to 75 watts by the same voltage power supply.
In the circuit, we use both transistors 2N3055 NPN types and MJ2955 PNP type to increase current up.

50W-75W stereo power amplifier using TDA2050 and 2N3055-MJ2955
Figure 3: the 50W + 50W (Max75W) stereo power amplifier project using TDA2050 and 2N3055-MJ2955

How to build
We do not need to explain a lot. Lets to build this project better.

the PCB layouts
Figure 4 the PCB layouts.

the component layout of this projects
Figure 5 the component layout of this projects

Parts you will need

IC1, IC2: TDA2050

Cr: by kunwangaetc

0.5W resistors, 5% Tolerance
R1, R8: 5.6K
R2, R9: 47K
R3, R18: 2.7K
R4, R11: 22K
R5, R12: 680 ohms
R6, R13: 22K
R7, R14: 1 ohms
R01, R02, R03, R04: 10 ohms 5W Resistors

Ceramic Capacitors
C1, C10: 47nF(0.047uF) 50V
C2, C4, C11, C13: 2.2nF(0.0022uF) 50V
C3, C7, C8, C9, C12, C16: 0.1uF 50V

Electrolytic Capacitors
C5, C14: 1uF 50V
C19, C20: 2,200uF 50V
C21: 2,200uF 80V

P1: 100KB, Dual Audio Potentiometer
P2: 100KA, Dual Audio Potentiometer
P3: 100K, Audio Potentiometer

Q1, Q3: MJ2955, PNP transistors
Q2, Q4: 2N3055, NPN transistors

On Figure 1 and Figure 3
R5,R12: 680 ohms, 0.5W Resistors 5%
R6,R13: 22K, 0.5W Resistors 5%

You can use TIP3055 instead of the 2N3055 and TIP2955 instead of MJ2955 because easy to use.

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