50W Stereo Power Amplifier Circuit Diagram STK4141

Audio Amplifier Circuit Diagram using STK4141 IC
Audio Amplifier Circuit Diagram using STK4141 IC


In the world of audio electronics, power amplifiers play a vital role in enhancing the sound quality and amplifying the audio signals to deliver a rich and immersive listening experience. In this article, we will explore the 50W stereo power amplifier circuit diagram that utilizes the STK4141 IC, a highly efficient and versatile integrated circuit.

STK4141 IC Specifications:

The STK4141 is an integrated circuit designed for audio power amplification applications. Developed by Sanyo, it offers a range of outstanding features and specifications that make it a popular choice among audio enthusiasts. Some key specifications of the STK4141 IC include:

  1. Power Rating: The STK4141 IC can deliver a power output of up to 25 watts per channel, making it suitable for medium-sized audio setups.
  2. High Efficiency: With its built-in efficient power supply circuit, the STK4141 IC offers excellent power efficiency, ensuring minimal power wastage.
  3. Wide Frequency Response: The IC exhibits a wide frequency response range, making it ideal for reproducing various audio frequencies accurately.
  4. Low Distortion: The STK4141 is designed to minimize distortion levels, resulting in crisp and clear audio output.
  5. Built-in Protection Circuitry: The IC incorporates protective mechanisms to safeguard against short circuits, thermal overload, and other potential electrical faults, ensuring the longevity of the amplifier circuit.

Stereo Power Amplifier Circuit Diagram using STK4141

This audio amplifier circuit can be built using a few basic components with the main STK4141 IC. The circuit diagram of this audio amplifier circuit project is shown below.

50W Stereo Power Amplifier Circuit Diagram
50W Stereo Power Amplifier Circuit Diagram

24V Power Supply Circuit Diagram

STK4141 50W Amplifier 24V Power Supply Circuit Diagram
24V Power Supply Circuit Diagram

Stereo Amplifier Circuit Diagram STK4141 50W
STK4141 Stereo Amplifier Circuit Diagram 50W

More Circuit Layouts

STK4141 IC Stereo Audio Amplifier 25W+25W
STK4141 IC Stereo Audio Amplifier 25W+25W

You can download the datasheet of STK4141 IC for a detailed description, pinout, features, dimension, and specifications.

Components List of Stereo Power Amplifier Circuit STK4141

Following is the list of all components used in this audio amplifier circuit project:

  • STK4141 IC x 1
  • 56k Resister x 4
  • 2.2k Resister x 4
  • 1k Resister x 4
  • 560R Resister x 2
  • 100R Resister x 2
  • 4.7R Resister x 2
  • 220uf Capacitor
  • 2.2uf Capacitor x 2
  • 100uf Capacitor x 3
  • 47uf Capacitor x 2
  • 10uf Capacitor x 3
  • 0.1uf (100nf) Capacitor x 2
  • 470pf Capacitor x 2
  • Power Supply +/- 12V to 39V Max
  • PCB Gerber Filer – Fore complete physical project detail or PCB printing, visit this site.

Explanation of 50W Stereo Audio Amplifier Circuit STK4141

Now let’s dive into the 50W stereo power amplifier circuit diagram that utilizes the powerful STK4141 IC. This circuit is fairly simple yet highly efficient, making it a preferred choice for several DIY audio projects. The circuit diagram consists of the following components:

  1. STK4141 IC: This serves as the main amplification component, delivering an impressive 25W of power output per channel.
  2. Power Supply: A suitable power supply circuit needs to be incorporated to provide the necessary power to the amplifier circuit. It is recommended to use a dual power supply configuration (+/- 26Vcc) for better performance. The maximum limit of power supply is +/- 39Vcc
  3. Input Stage: The audio input signals are fed into the amplifier circuit via coupling capacitors to remove any DC offset and ensure proper transmission of audio signals.
  4. Feedback Network: A well-designed feedback network is implemented to regulate the gain and stability of the amplifier.
  5. Output Stage: The amplified audio signals are then delivered to the output stage, which drives the connected speakers or other audio output devices. The recommended load resistance is 8 ohms.


The 50W stereo amplifier circuit diagram using STK4141 IC provides an efficient and robust solution for audio power amplification needs. With its excellent power output, wide frequency response, and low distortion levels, it delivers superior audio quality suitable for various applications. Whether you are an electronics enthusiast or a professional audio system designer, incorporating this circuit in your projects will undoubtedly enhance the audio experience. Upgrade your audio setup with the 50W stereo amplifier circuit using the reliable and versatile STK4141 IC, and enjoy the immersive soundscape it brings.

More projects, You may like:

For more project and circuit diagrams, you can go through the Schematics in the main menu where you can find many interesting projects and circuit diagrams like audio amplifier circuits, voltage booster circuitbattery charger circuit and timer circuits etc., which are all beginner circuit projects. Feel free to check them out!

50W Stereo Power Amplifier Circuit Diagram
50W Stereo Power Amplifier Circuit Diagram
Audio Amplifier Circuit Diagram using STK4141 IC
Audio Amplifier Circuit Diagram using STK4141 IC

Thank you for visiting the article.

(Visited 646 times, 1 visits today)

Leave a Reply

Your email address will not be published.