The TDA2822 is a dual audio power amplifier IC commonly used for low-power audio amplification applications such as portable radios, mini stereo systems, and battery-powered audio devices. Operating at a voltage range of 3V to 15V, the TDA2822 provides excellent sound output when connected to small 4Ω or 8Ω speakers. The circuit shown here uses the TDA2822 in stereo mode to drive two speakers from separate input channels (left and right). This setup is efficient, compact, and perfect for DIY audio amplifier projects.
Components Required
S.No
Component Name
Value
Quantity
1
TDA2822 IC
—
1
2
Capacitor
100µF
2
3
Capacitor
1µF
1
4
Resistor
10kΩ
2
5
Speaker
4Ω
2
6
Power Supply
+9V DC
1
TDA2822 Pinout
Pin Number
Pin Name
1
OUTPUT 1
2
Vcc
3
OUTPUT 2
4
GND
5
NF 2
6
INPUT 2
7
INPUT 1
8
NF 1
Circuit Diagram
Circuit Explanation
The TDA2822 (U1) is the main component of this stereo amplifier circuit.
Pin 2 (VCC) is connected to a +9V DC power supply, while Pin 4 (GND) is grounded.
Input signals are fed into Pin 7 (1IN+) and Pin 6 (2IN+) via 10kΩ resistors from the right and left audio inputs respectively.
The negative inputs Pin 8 (1IN−) and Pin 5 (2IN−) are grounded through a 1µF capacitor (C1).
Output pins 1 (1OUT) and 3 (2OUT) drive the two 4Ω speakers through 100µF capacitors (C2 and C3) to block DC and allow AC (audio signal) to pass.
This configuration allows clear audio amplification while maintaining compact design and low power consumption.
