TDA2050 amplifier stereo 35W-75W

If you want to build hi-fi power amplifier the size about 30watt to 50Watt or 75 watt at good sound and build easy. I recommend you use TDA2050 amplifier circuits below that builds with the integrated circuit and PCB layout.

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

The pins connections

The schematic diagram

The music power into 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.

35 watts TDA2050 Amplifier mono




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 balance sound.

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

the 50W + 50W stereo power amplifier circuit using TDA2050
Figure 1 the 50W + 50W 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.

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

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

the 75W + 75W stereo power amplifier project using TDA2050 and 2N3055-MJ2955
Figure 3 the 75W + 75W 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
The resistors
R1,R8______5.6K_____0.5 watts resistors
R5,R12____680 ohms __”___________”
R7,14______1 ohms______”___________”
R01,R02,R03,R04__10 ohms 5W Resistors

C1,C10_______47nF(0.047uF) 50V__________Ceramic capacitors
C2,C4,C11,C13_______2.2nF(0.0022uF) 50V___Ceramic capacitors
C3,C7,C8,C9,C12,C16_______0.1uF 50V____________Ceramic capacitors
C5,C14_______1uF 50V Electrolytic capacitors
C17,C18_____2,200uF 50V Electrolytic capacitors

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 ____0.5 watts___Resistors 5%
R6,R13____22K _________0.5 watts___Resistors 5%
You can use TIP3055 instead of the 2N3055 and TIP2955 instead of MJ2955 because easy to use.

4 thoughts on “TDA2050 amplifier stereo 35W-75W”

  1. hello,

    I’m looking for a circuit for a simple 3 phase bldc -controller .
    without mikroprozessor.und without hall sensoren.12-24 volts.5 ampre .

    circuit : clock generator, 3 phase with 4017cmos , and 3 power stages.

    many greetings


  2. The TDA2050 is a very well designed power amplifier. However, in the foregoing, there are various suggestions regarding enhancing its output power. I have found that the TDA2050 can sink/source 5 Amps maximum. If built into a bridge configuration and driving an 8 ohm speaker, the peak power for such a configuration is 5 x 5 x 8 (i.e. I*I*R) which is around 200 Watts peak, namely around 130 Watt RMS into an 8 ohm load. Such a configuration works well in practice, both with split rail power supplies and with single rail power supplies. The advantage of a bridge configuration is avoiding a need for the output electrolytic capacitor which, if too large (i.e. grater than 1000 uF for supply rails in excess of 40 volts total from VS+ to VS-), and also not by-passed via blocking diodes to the VS supply rail(s), can cause failure of the TDA2050 (see its data sheet for more guidance).

    In operation, the TDA2050 provides very low distortion over most of its operating range, but needs to have a 022 uF plate ceramic capacitor strapped across its VS- to VS+ pins (as close to the IC as possible), otherwise it has a tendency to oscillate parasitically at a very high frequency (e,g, several MHz).

    Hope above is useful to you !

    Kind regards

    Dr Tim

  3. Typos in my previous comment:

    0.22 uF plate ceramic strapped as close as possible to IC to avoid parasitic oscillations.

    Note that the TDA2050 is rated at 50 volts absolute maximum supply rail, so running it on +/- 25 volts (as suggested above by other contributors) is perhaps a bit risky; LM1875 can be run to 60 volts total supply rail, but its output current is limited to 4 Amps. My experience with many many TDA2050 that I have used, is to limit the total supply rail to 45 volts maximum (providing a few volts safety margin).

    Kind regards


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