TDA2822 is a monolithic integrated audio amplifier circuit that offers the flexibility to be configured either in stereo mode or bridge mode (BTL). This IC is characterized by its minimal crossover distortion, low quiescent current, and is packaged in a 16-pin power DIP format. It can be effectively operated within a supply voltage range spanning from 3V to 15V.
The primary applications for the TDA2822 include serving as a headphone amplifier, being integrated into portable audio systems, mini radios, hearing aids, and functioning as a preamplifier, among others. In stereo mode, this IC can provide an output power of 0.65W per channel when connected to a 4-ohm loudspeaker with a 6V supply voltage. When configured in bridge mode, it can deliver an even more potent 1.35W output into a 4-ohm loudspeaker using the same 6V supply voltage.
Circuit diagram
Circuit description
TDA2822 stereo amplifier circuit
Figure 1 illustrates the configuration of the TDA2822 IC in stereo mode. In this setup, the left channel input is connected to the non-inverting input (pin 1) of the first integrated amplifier stage, while the right channel input is directed to the non-inverting input (pin 16) of the second integrated amplifier. To ground the inverting inputs of these built-in amplifiers, separate 1000uF capacitors (C5 and C6) are employed.
The amplified left and right channel outputs are accessible at pins 6 and 11 of the IC. These outputs are then linked to their corresponding speakers through the use of capacitors C1 and C2. Furthermore, a resistor-capacitor branch consisting of a 0.1uF capacitor and a 4.7-ohm resistor is connected across the speakers. This component arrangement serves the purpose of enhancing high-frequency stability and preventing potential oscillations.
Finally, C7 assumes the role of a power supply filter capacitor within the circuit.
TDA2822 amplifier circuit in bridge mode
To augment the output power of the TDA2822 amplifier, you can employ it in mono mode using the bridge configuration, as depicted in Figure 2. In this setup, the audio input is connected to the non-inverting input of the first integrated amplifier. Meanwhile, the non-inverting input of the second integrated amplifier is tied to ground. To ground the inverting inputs of these amplifiers, a capacitor branch consisting of C9 and C11 is utilized.
Additionally, branches R5, C8, and R6, C10 are introduced to enhance high-frequency stability and deter potential oscillations. Capacitor C12 plays a pivotal role in filtering the power supply within this configuration.
Notes
- The circuit can be assembled on a Vero board.
- The power supply can be anything between 3 to 15V DC.
- The power supply used for this circuit must be well regulated and free from any sort of noise.
- Optional 10K potentiometers can be added at the input lines for controlling the volume.
- It is better to mount the TDA2822 on an IC base.
