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32 watt Amplifier Circuit using TDA2050

32 watt Amplifier Circuit using TDA2050

The post explains how to build a simple yet powerful 32 watt amplifier circuit using a single chip TDA2050 and with a handful of resistors and capacitors.

By: Dhrubajyoti Biswas

Working Principle of TDA2050V

This article will detail building a stereo amplifier along with an output for a headphone jack. It is built by using the IC TDA2050V integrated circuit. According to the data sheet that comes along with the IC, TDA2050V is ideal for Class-AB based audio hi-fi amplifier.

The required operating supply voltage for TDA2050V should be in the range of +/-4.5V to +/-25V.

Using 25 watts of power you can achieve at least 65% efficiency. However, it is important to note that to maintain stability on the system the circuit gain should be managed with a gain of around 24dB.

We built the amplifier with an intent to use it with RB-51 bookshelf speakers. They are 8 ohms possessing a sensitivity of 92dB @ 2.83V / 1m.

Since this amplifier utilizes less power, therefore using TDA2050V is quite a right choice.

Moreover, the amplifier will also work with other audio devices, such as, tuner, mp3 player etc. It may be interesting to note that, the smaller TDA2050V chip produces a better quality sound than the bigger version.

32 watt Amplifier Circuit using TDA2050


Constructing the Amplifier

The above diagram is of an application that uses split-supply. The diagram is taken from the datasheet for ease of understanding. Also it is advisable to read the datasheet that comes along with TDA2050V chip. This will help to understand setting up the stereo in different ways.

The datasheet specified for the IC also details a recommended PCB design, which we have used as a reference for this experiment. The figure above, taken from the datasheet shows the basic PCB layout:

The amplifier that we have built in this experiment, its schematic design is presented below

headphone amplifier  Circuit using TDA2050


Schematic of hi-fi amplifier using TDA2050

To build the circuit, here we have followed the PCB design as shown in the above figure. Also, the circuit could be simply assembled on a perfboard.

In order to block DC current flow, we used a capacitor of 1uF MKT type. However, there is no such restriction and you are free to go for any other relevant capacitor as per your choice.

Constructing a circuit is not at complex. However, there are certain vital factors that should be kept in mind during design, as stated below:

- Grounding or earthing is very important to maintain low noise and an hum-free response from the system. This is why star grounding process is probably the best suited in this case. The system employs two ground points, use one for signal and the other for power, further connecting both of them via singular connection.

- For each channel use individual power supply.

- Keep signal wiring short and ensure the wires are twisted tightly. Maintain a distance with the AC power sources. Also it would be better if you can keep the wiring close to the chassis.

Power Supply

In this amplifier design the power supply adheres to the standard power supply regulations and employs snubbers for better safety.

Besides, we used torroidal transformer of 120VA and 18 Volt dual secondaries. Also we used 35A rectifier bridges, however, you can also use 15A – 25A bridge.

As per the design of specs, it uses MUR860 ultra-fast recovery diodes. You can also try other discreet diodes that are ultra-fast, but as per this experiment we figured out that it can be ignored and normal rectifier diodes can be used.

You can find 10,000uF capacitor for each power supply. The hum suppressed by the supply is quite inaudible albeit we could hear some on a microphone, when it has max volume and has no signal connection.

TDA2050 Power Supply Design


For the enclosure, here we used Hammond’s chassis [Model ID: 1441-24]– 12” x 8” x 3”, steel built and satin black in color.

The circuit board and transformer was carefully placed above just on the top of the enclosure. The volume control, headphone input and power button was placed at the front for ease of use.

We used gold-plated RCA standard jackets for the input. For output we used standard output plugs of three-way binding posts, which accepts bare wire, 4mm banana plugs or spade connector. However, please note that the binding posts of the speaker and the input jackets have their insulation from the chassis made by nylon spacers.

Heat Sink

As a standard procedure we have placed the heat-sink on the rear of the chassis, which is measured 50mm x 88mm with 35mm fins @ 2.9 C/W. Also we need to make a hole on the chassis so as to mount TDA2050 directly. As a note, please ensure TDA2050 is kept separate from the chassis because of the potential issue on TO-220 package. If this is not taken care of, then there is high chance of the chip to get destroyed once the system receives power.

In regard to isolation, you can use mica or silicon pads. Also please keep in mind to add a spacer for mountain crew to save the chip. Upon setting up the system, do finally check all the components and their placements. For instance, ensure a check to avoid continuity between heat-sink / ground / chassis and the chip.

As a conclusion, do maintain good thermal contact. Here we used thermal grease before mounting the system.


About the Author

I am an electronic engineer (dipIETE ), hobbyist, inventor, schematic/PCB designer, manufacturer. I am also the founder of the website: https://www.homemade-circuits.com/, where I love sharing my innovative circuit ideas and tutorials. If you have any circuit related query, you may interact through comments, I'll be most happy to help!

20 thoughts on “32 watt Amplifier Circuit using TDA2050”

  1. Kindly let me know if I can use the center transformer in this link mentioned below for TDA2050
    Split supply circuit:
    PLease let me know ASAP

  2. Thank you for the reply Sir. Btw TDA 2030,2040,2003,2050 and LM 3875,3876 are now obsolete and Texas Instruments doesnt manufacture them any more. So can provide the circuit with any alternative if possible?

  3. Sir I want to power a 60watt 8ohm subwoofer. Can u please modify the circuit with dual tda2050 in bridge mode?? Also please tell me the transformer specification that I need to buy. Will Ne5532 increase the gain?

  4. Sir,
    I want to used this in a car , so could you suggest the power supply in car using single battery how can I obtain +12 0-12 voltage .

  5. thanks sir for reply,i have used 100k pot for input & now i will replace filter cap from 4700uf to 6500uf or 10,000uf as u said.One more question sir ,can 2 tda2050 work on12-0-12 5a current because when i switch on the amp cracking sound continue coming from speaker & heatsink heating more .should i decrease the current of transformer & use 12 volt center tapped 3A current transformer? How much current need to drive 2 tda2050 stereo circuit at full volume? plz help me sir

    • I think the problem is not in your power supply

      If your IC is getting hot even at 12V then your IC could be faulty or not an original version.

      reduce the volume and check again, if still distortion persists then surely the IC has problems assuming you have done rest of the things perfectly.

  6. i have made this stereo tda2050 amplifier split supply circuit according to datasheet on 12-0-12 5amp but music is low and lots of noise is coming from speaker .speaker is of 8 ohms & input source is mp3 player also i have made star ground. plz sir help me i dont have much knowlege about electronic i have spend lots of money & time in making this amp

    • are you using a volume control at the input? you should use one and adjust it for adjusting the input level correctly.

      make sure the filter capacitors are large enough, above 6500uF/50V or even 10,000uF

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