Tda2003 Pcb

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).

TDA2002/TDA2003 Mono Amplifier PCB 1 Kit (Local) Rain Detection PCB Kit (Local) රු 0.40 – රු 45.00 Battery Rechargeble 3.7V 5000mAh 18650 Li-Ion (Not original, capacity might vary) රු 380.00.

  1. TDA2003 requires few external components and a small heat sink to operate at normal conditions. The output power is about 6, 7.5, 10 or 12W if RL equals 4, 3.2, 2 or 1.6 Οhm respectively. The schematic is the original one provided by STMicroelectronics.
  2. TDA2003 Ver1.0 9 Figure 20. Output power and drain Figure 21. Output power and drain current vs. Case temperature(RL=4Ω) current vs. Case temperature(RL=2Ω) PRATICAL CONSIDERATION Printed circuit board.

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

The pins connections

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

35 watts TDA2050 Amplifier mono

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

Ready to get started?


Circuit diagram of 35 watts amplifier using TDA2050.

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.

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.

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.

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.

Figure 4 the PCB layouts.

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

Skema Pcb Tda2003

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.

Related Posts


I always try to make Electronics Learning Easy.

See, this is a TDA2003 amplifier circuit, popular IC from SGS Thomson.

Why we should use this? It is the normal operation of the integrated circuit, the music amplifier for car audio radio sound.

Which uses a supply voltage from a 12V car battery. But this circuit is adapted for use in a home. With changing the power supply voltage to 18V.

So, this IC can easily deliver 10W to a 4Ω load speaker.

Read also: TDA2004 – TDA2005 subwoofer Bridge Amplifier circuit diagram

Datasheet in short

Look at TDA2003 looks like TDA2030.

Cre photo: Exiron

TDA2003 Pinout and symbol

Then, see its Circuit connection or symbol below.

We will see that it looks like TDA2030.

The maximum output power and relationship

Do you want to know the output power of this chip? If, Yes look at the graph below.

It shows the relationship between power out and applied voltage.

We will notice how the 8 watts only applies to a 4 ohms speaker. And, results when the applied voltage (VS) is about 18V.

We can use load is 1.6 ohms to 4 ohms speaker impedances.

Then, if we change load is an 8 ohms speaker, the power is practically halved.

This feature is a good side, right? It means that you can parallel:

  • Two 8-ohm speakers
  • Four 8-ohm speakers
  • Two 4 ohms speaker.

They still get the same power. Or loudness emerging from each speaker.

We may place four 8 ohm speakers in parallel to output.

The volume is quite sufficient for the people in the assembly room and the volume control was only about half.

The clarity and bass response was exceptional. The figure distortion up to 5 watts is 0.2%.

In the datasheet, If you use 14.4V of VS.

In fact, the amplifier has very good figures up to 8 watts with a 2 ohms speaker and 6 watts with a 4-ohm speaker.

Once these limits are reached, the distortion level increases rapidly to 10%.

And at this level, the average person can noticeably hear that something is wrong.

How TDA2003 circuit works

See in the circuit below we will learn how it works. The output power is more than about 10 watts RMS.

And the TDA2003 can protect from damage and short circuits. When the load over.

And, Maximum Voltage of 28 volts. At the frequency response 40 Hz to 15 kHz.

The external components required for the power amplifier are either for feedback, decoupling or high-frequency suppression.

The amplifier itself is of a highly stable design with an enormous open-loop gain.

What is more? Let’s learn.

Here is step by step a process in each component.

Input capacitor

C1: The 4.7 uF electrolytic at the input. It is designed to AC couple the amplifier to a source such as a tuner or any audio signal.

The C1- 4.7 mfd input capacitor allows the circuit to operate without and DC shift occurring.

We may add the volume control to the input. And must be placed before the capacitor.

The power filter capacitor

See at the power rail has a C7: 1,000uF electrolytic and C6: 0.1uF capacitor across it.

The C7 is a storage capacitor for supplying high currents during peak passages. And, it also reduces the power supply ripple.

The C6 capacitor is quite important. It can prevent a form of oscillation from occurring at risky power supply impedance levels.

Tda2003 amplifier circuit pcb

Frequency Cut-off

The C3: 0.039uF and R1: 39 ohms resistor form the negative feedback network.
The value of C is designed to set the upper-frequency cut-off.

And a larger value of C3 will reduce the maximum frequency.

The R1 also sets the high frequency cut off point and if reduced in value, oscillation may occur.

The gain setting

The actual gain of the amplifier is set by the ratio of the 220-ohm resistor and 2.2-ohm resistor.

If you like the TDA2003. And want to try it. See:

Read next: TDA2009 Amplifier stereo 10W | High Bridge 28 watts

Parts you will need

  • IC1: TDA2003, 10-watt audio amplifier IC
    Electrolytic Capacitor
  • C1: 4.7uF 25V
  • C2: 470uF 25V
  • C4,C7: 1,000uF 25V
    Ceramic Capacitor
  • C3: 0.039uF 50V
  • C5, C6: 0.1uF 50V
    0.5W Resistors, tolerance: 5%
  • 39 ohms
  • 220 ohms
  • 2.2 ohms
  • 1 ohm
  • SP1: 2 ohms to 8 ohms Speaker

When entering the power supply 15 volts to the circuit. The C1 coupling audio signal through the VR1 to adjust the volume. Then sent to the C2 anti-noise DC input signal to pin 1 of IC. The non-inverting amplifier circuit is a non-return phase. This is the signal output pin 4, by a C5 enhances the stability of low-frequency response the better. And the noise will be dropped down to the ground by R4 and C6 before outputting to speakers. Another part of the output signal, which is fed back through C3, and R1, to enter the pin 2 inverting. To maintain a constant frequency response at-3dB. And if you want to add. The frequency response is to reduce the C3. The C8 is a filter file before the operation.C7 cut out noise from the supply. If you want a stereo amplifier,Is to create an additional set.

Read others: Thanks Credit: 8-watt amplifier using TDA2002 on Talking Electronics No.9

New design by Mark

Mr. Make saids”…

I found that the gain section limits the amplifier from performing truly. So I used a 1k resistor with a 470uf capacitor to ground from pin 2. I didn’t place any feedback resistor and it works quite well.

I am proud of his parent. He will have a good career future.

Thanks for sharing!

Here are a few related posts you may find helpful, too:

Tda2003 Pinout

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Tda2003 Pcb Fl

I always try to make Electronics Learning Easy.

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