Introduction
Audio amplifiers are circuits that transform low-power input audio signals into high-power audio signals at the output. The purpose of the circuits is to provide a noise-free, efficient, and low distorted audio signal with greater magnitude at the output. Different devices use different kinds of audio amplifiers. The amplifier devices usually have two stages, a pre-amplifier that only amplifies voltage gain and not the current gain, and a power amplifier that necessitates power modification of the audio signal. So, this article is about making a power amplifier using a 2SC5200 Power transistor.
Primarily, amplifiers are the circuits that boost the input power of the system at the output. Audio amplifiers enhance the audio amplitude of input signals. The amplification at the output can be understood by the gain of the circuit. Consequently, the power gain of any amplifier is greater than one. Amplifiers are classified into pre-amplifier and power amplifiers. Power amplifiers are further divided into so many other types. So, in this article, we will discuss audio power amplifiers.
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Hardware Components
The following components are required to make Audio Amplifier Circuit
| S.no | Component | Value | Qty |
|---|---|---|---|
| 1. | PCB | – | 1 |
| 2. | Transistor | 2SC5200 | 1 |
| 3. | Resistor | 1K | 1 |
| 4. | Capacitor | 1000uf | 1 |
| 5. | Power supply | 12V | 1 |
| 6. | 2 port input terminal | – | 2 |
| 7. | Speaker | – | 1 |
| 8. | Potentiometer | 100k | 1 |
2SC5200 Pinout
For a detailed description of pinout, dimension features, and specifications download the datasheet of 2SC5200
Audio Amplifier Circuit
Working Explanation
The circuit gets turned on by supplying the 12v DC power and starts working when audio input is given through a computer, smartphone, or a device like that. The capacitor that is connected at the base of the transistor blocks the DC component, and the potentiometer control the input voltage. Hence, the AC signal is generated at the base of the transistor which works as the control signal. The collector of the transistor drives the output load, that is the speaker.
Application and Uses
- Public addressing systems.
- Audio instruments.
- Sound reinforcement system, etc.
