Introduction
Audio amplifiers are circuits that transform low-power input audio signals into high-power audio signals at the output. The purpose of the audio amplifier circuits is to provide a distortion-free, effective, and low-noise audio signal with higher amplitude at the output side. Thus different devices use different kinds of audio amplifiers according to their requirement and need. Some of the audio devices use a pre-amplifier that only increases voltage gain and not the current gain. However, some devices use power amplifiers for power modification of the audio signal. Also, some devices need high power output while some need low power output amplifiers. So, In this tutorial, we will make a “10 Watt Audio Amplifier Circuit”
Every public addressing performances use a microphone and speaker, as it is a necessary part of any public event. In many events, speakers just play music from any music player or mobile phone. So, if you are a beginner student of electronics or have an interest in electronic devices and circuits, then you must have thought that how the internal circuitry of this may work. Basically, these kinds of systems have amplifiers in them which amplify the audio signals coming from any device or human vocals. In more simplistic words, amplifiers increase the low power input electronic audio signals at the output that we will see by making this amplifier circuit in this article.
Specification of LM1875
- The maximum load resistance for the IC is 8 ohms
- It has a maximum input bias current of about 2 amperes at 25V.
- It provides low harmonic distortion or noise.
- The IC has a high current capability of about 4ampers.
- The maximum working temperature of the IC is 150 degrees.
Hardware Required
| S.no | Component | Value | Qty |
|---|---|---|---|
| 1. | Audio Amplifier IC | LM1875 | 1 |
| 2. | Speaker | 8Ω | 1 |
| 3. | Capacitor | 4.7µF, 1000µF, 0.1µF | 1, 1, 1 |
| 4. | Resistor | 82K, 4.3K, 10 ohms | 2, 1, 1 |
| 5. | Battery | 9V | 1 |
Circuit Diagram
Working Explanation
Our 10 Watt Audio Amplifier Circuit uses the LM1875 IC having 5 pins and requires very few external components. The LM1875 is a great power amplifier that provides low noise or distortion and therefore has been used in high-quality audio applications. It can easily give power is 20 watts into a 4 ohms or 8 ohms load. But, our circuit generates the 10W. Coming towards the pin configuration, Pin 1 gets the positive audio input signal, while pin 3 gets the negative audio input. Vcc is applied at pin 5 of an IC. Consequently, High gain output having a fast slew rate and wide bandwidth is observed at pin 4 of an IC. The output is provided to the capacitor C3 which drives the speaker.
Application and Uses
- Electronic instruments like electronic keyboards and guitars.
- The circuit can be used in children’s gadgets and toys, etc.
- Radio wave transmitters can adapt the circuit for their use.
- Also, it can be utilized in hi-fi electronic gadgets and devices.
- Moreover, military applications can also utilize this.
- Robotic circuits can also use this circuit for audio amplification.
- Further, home audio systems can use this circuit.
- Also, Sound systems
- Hence, it is used for high-performance audio circuits.
