The circuit of 2×32 Watts stereo amplifier consists of two channels. In both the channels the central component is the IC TDA 2050 V developed by ST Microelectronics. The audio input signal is given to each of the channels in non-inverting input pin of IC TDA 2050V. For decoupling purpose, capacitor 1 uF (C1 and C8) is connected so that input can be given through it as shown in the circuit diagram.
The gain of the amplifier in each channel is determined by the resistors 22k (R1 and R5) and 680 ohm (R2 and R6). The value of gain is the ratio of 22K and 680 ohm. To improve the frequency response of the amplifier, a network called Zobel network is used in this circuit. Here the Zobel network is the combination of 2.2 ohm (R4 and R8) resistor and 0.47 uF (C3 and C14) capacitor that are connected in series between the amplifier output and ground in both the channels. By the effect of Zobel network, impedance of the speaker appears as resistive load and that improves frequency response of the amplifier.
The central part of the circuit TDA 2050V IC is an integrated monolithic 32 watt class B audio amplifier. It has some extra features like short circuit protection, low distortion, thermal protection etc. and it is available in Pentawatt package. Proper heat sink should be provided for this IC in PCB. Power supply required for this circuit is 18 V DC dual supplies. In order to get maximum output power, the input required is 200m Vpp RMS. Volume control is done by 10K pots connected at input lines. Assembling this circuit on a good quality PCB will give the desired output.