A popular dual channel stereo audio amplifier chip for low to medium power audio applications is the IC 6283.
Build your own circuit or purchase pre made amplifier boards that use this integrated circuit.
A simple stereo amplifier that is simple to construct is the 6283 audio amplifier circuit.
It boosts a weak stereo signal using an integrated circuit a single, powerful chip.
This chip comes in a tiny simple to solder packaging and is particularly made for portable electronics like MP3 players.
Up to 4.6 watts of power per channel can be sent to your speakers via the circuit depending on the power supply voltage which ranges from 9 to 12V.
Circuit Working:
Parts List:
| Category | Item | Quantity | Notes |
|---|---|---|---|
| Resistors | R1 82Ω 2 watt | 1 | |
| R2 82Ω 2 watt | 1 | ||
| Capacitors | Ceramic 0.1μF | 2 | |
| Electrolytic 100μF 16V | 2 | ||
| Electrolytic 47μF 16V | 2 | ||
| Electrolytic 1μF 16V | 2 | ||
| Electrolytic 220μF 16V | 1 | ||
| Electrolytic 1000μF 16V | 3 | ||
| Semiconductors | IC 6283 | 1 | |
| Other | 8Ω speakers | 2 |
The 6283 chip is a feature rich amplifier circuit that is easy to use.
In order to prevent overheating, it has safety measures and is capable of operating on a power supply range of 6 to 15V.
An additional benefit is the high input resistance 30k, which eliminates the need for an additional pre amplifier stage for the majority of audio sources.
This circuit is intended to function as a stereo amplifier and is usually driven by a 12V source.
Two capacitors C11 and C12 at the input, each having a value of one microfarad aid in controlling the audio signal.
Two 8 ohm speakers are intended to be connected to the output.
In this circuit pins 2 and 5 are used by channel 1 for the output and audio input respectively.
With pin 7 serving as the input and pin 10 serving as the output channel 2 has a similar configuration.
The circuits elegance lies in its ability to modify the amplification level or gain by varying the resistors R1 and R2.
It is configured for a 45 dB gain in this particular configuration.
To calculate gain precisely, you will need to refer to the ICs datasheet.
The designs simplicity is one last benefit, because of its internal architecture, the 6283 chip which has just 12 pins arranged in a single row requires very few additional parts to function as a stereo amplifier.
Formulas:
When designing a basic stereo audio amplifier circuit with the IC 6283, factors including power supply voltage, speaker impedance, gain settings, and thermal control must be taken into account.
The following are the main formulas for creating such a circuit design:
Calculating Gain:
External feedback resistors can be used to change the amplifier circuits gain.
One way to compute the gain G is to:
G = Rf / Rin
where,
- Rf is the feedback resistor and Rin is the input resistor.
Calculating Output Power:
One may estimate the maximum output power Pout that will be supplied to the speaker by utilizing the following formula:
Pout = Vpeak2/(2 * R)
where,
- The speakers impedance 8Ω is represented by R and Vpeak represents the peak voltage swing across the speaker.
These calculations and suggestions will help you create an efficient, basic stereo audio amplifier circuit that makes use of the IC 6283.
For your stereo audio application, modify component values according to the particular needs and performance objectives.
How to Build:
To build a Simple Stereo Audio Amplifier Circuit using IC 6283 follow the below mentioned steps
- Assemble all the components as mentioned in above diagram
- Connect pin 1 to pin 2 of IC1 through capacitor C1.
- Connect pin 2 of IC1 to positive side of capacitor C10 and negative to 8 ohm speaker audio output1.
- Connect pin 3 of IC1 to positive end of capacitor C2 and negative end to ground.
- Connect pin 4 of IC1 to ground through resistor R1 and capacitor C3.
- Connect pin 5 of IC1 to audio input1 through capacitor C12.
- Connect pin 6 of IC1 to ground.
- Connect pin 7 of IC1 to audio input2 through capacitor C11.
- Connect pin 8 of IC1 to ground through resistor R2 and capacitor C4.
- Connect pin 9 of IC1 to ground.
- Connect pin 10 of IC1 to 8 ohm speaker one end through capacitor C7.
- Connect pin 11 of IC1 to pin 10 through capacitor C5.
- Connect pin 12 of IC1 to positive supply of +12V, connect capacitor C6 positive end from pin 12 to its negative end to ground.
- Connect 8ohm speaker audio output2 one end from pin 10 and other end connect to 8ohm speaker audio output1 and other end of 8 ohm speaker audio output 1 connect to capacitor C10 negative side.
Safety Notes:
- Exercise caution when building electrical circuits.
- Before you try to build one yourself, make sure you understand the circuit and the safety measures.
- Purchasing a pre assembled amplifier board can be a safer option if you are new to computer work.
Conclusion:
The 6283 integrated circuit provides a simple and portable audio amplifier solution.
With few external components, it combines several characteristics such as wide voltage range and thermal protection, into a single chip.