TDA2822 is a monolithic integrated audio amplifier can be configured in stereo mode or bridge (BTL). The IC has low crossover distortion, low quiescent current and is available in 16 pin DIP package power. The TDA2822 may be operated from a supply voltage range of 3V to 15V. The main applications are headphone amplifier TDA2822, portable audio, radio, mini headphones, preamp etc. The IC can deliver an output power of 0.65W per channel into a 4 ohm speaker 6V @ HV mode 1.35 W stereo and a speaker 4 ohm high voltage supply 6V @ bridge mode.
IC TDA2822 stereo set shown in Figure 1. The left channel input is applied to the noninverting input (pin 1) of the first built in the amplifier stage and the right channel input is applied to the noninverting input (pin 16) of the second amplifier. The inverting input of these built in amplifiers are grounded separately using 1000uF capacitors (C5 and C6). The amplified outputs (left and right) are available at pins 6 and 11 of the IC. The outputs are attached to the respective speakers, using capacitors C1 and C2 respectively. The branch capacitor resistance (ohms 0.1uF and 4.7) connected via the speakers are designed to improve stability and avoid high frequency oscillations. C7 is the power supply filter capacitor.
The output of the amplifier TDA2822 can be increased by use in mono using the bridge configuration shown in Figure 2. The audio input is applied to the noninverting input of amplifier built for the first time. The non-inverting input of the second built-in amplifier to ground. The inverting input of these amplifiers are based with the C9, C11 capacitor branch. Branches R5, R6 C8 and C10, are to improve stability and avoid high frequency oscillations. Capacitor C12 is used for filtering the power supply
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.