Introduction
In this article, we will delve into the world of audio amplification and explore how to construct a beginner-friendly stereo amplifier circuit using LM380 ICs. Get ready to add power and depth to your sound system with this efficient and easy-to-build amplifier circuit. Designed for power audio amplification, the LM380 integrated circuit is a versatile solution for all your amplification needs. From intercoms to TV sound systems, this circuit can bring a new level of clarity to your audio. So, turn up the volume and dive into the LM380 stereo amplification circuit!”
Hardware Required
You will require the following hardware for the Stereo Amplifier Circuit.
| Components | Value | QTY |
| IC | IC1, IC2 is LM380 | 1, 1 |
| Transformer | – | 1 |
| Bridge Rectifier | Diode 1 TO 4 = 1N4001 | 1 |
| Polar Capacitor | 470u, 10u, 1000u | 2, 2, 1 |
| Non Polar Capacitor | 0.1, 0.0033 | 2, 2 |
| Resistor | 2.7 Ω | 2 |
| Variable resistor | 2.5M, 2.2M Ω | 2, 2 |
| Speaker | 8Ω | 2 |
| Switch | – | 2 |
Circuit Diagram
Working Explanation
- Input: The stereo amplifier circuit has two inputs, one for the left channel and the other for the right channel. The input sensitivity of the circuit is 200 mV, and the input impedance is 150 k.
- LM380 IC: The LM380 IC provides a constant internal gain and a wide range of supply voltage, large peak current, large input impedance, and minimal distortion. It is commonly used in intercoms, servo motors drivers, alarms, TV sound systems, etc.
- Ground Reference: The three ground pins on both sides of the IC make its use more accessible for anyone to use it. The input signal allows the ground reference signal, and the output signal maintains its level to half of the input voltage used.
- Amplification: The LM380 IC amplifies the input signal and provides an output that can drive a loudspeaker. The output of the left and right channels are combined to form the stereo output.
- Output: The stereo amplifier circuit provides 2.5W RMS/channel output power. The circuit’s distortion is 0.2%, and the bandwidth is 100kHz (tone control flat). The loudspeaker impedance can be 8 ohms or 15 ohms.
Final Words
The proposed stereo amplifier circuit is simple and easy to build using the LM380 audio amplifier ICs. The circuit provides a good output power with low distortion and is suitable for various applications. Try this circuit; it will improve your circuit-designing skills. Also, feel free to ask questions about any query in the comment section. Happy learning!
