Amplifier Circuit Diagrams

2 x 32 Watts stereo amplifier schematic circuit diagram


The circuit given here is of a 2 x 32 Watt stereo amplifier using the famous TDA2050V IC from ST Microelectronics. The TDA2050V is an integrated monolithic 32 watt class AB audio amplifier IC available in the Pentawatt package. The IC has lot of good features like low distortion, short circuit protection, thermal shut down etc.

Two TDA2050V ICs are used here, one for each channel. For each channel the input audio signal is fed to the non-inverting input of the IC through 1uF (Non-Polarized electrolytic) capacitor and this capacitor performs the job of DC decoupling. The ratio of the 22K and 680 ohm resistors determine the gain of each channel. The network comprising of 2.2 ohm resistor and the 0.47uF capacitor connected between the output of the amplifier and ground forms a Zobel network which represents the impedance of the speaker appear as a steady resistive load to the amplifier output and this dramatically increases the high frequency response.

Components you’ll need:

  • 1x TDA2050 IC (for each channel)
  • Resistors (R1, R2, R3, R4, R5): Values depend on the specific design and desired gain.
  • Capacitors (C1, C2, C3, C4, C5): Electrolytic capacitors with appropriate voltage and capacitance ratings.
  • Power supply: Typically +/- 12V to +/- 30V DC.
  • Input source (e.g., audio input).

Circuit diagram

2 x 32 Watts stereo amplifier schematic circuit diagram

  • Connect the power supply to the positive and negative rails, making sure the voltage levels are within the IC’s specified range.
  • Connect the input source to the input pins of the TDA2050 (U1).
  • Connect the output pins of the TDA2050 to your speakers.
  • Connect the resistors and capacitors as needed for biasing and filtering based on your specific design requirements.

Please consult the datasheet for the TDA2050 and adjust component values according to your desired gain, input impedance, and other specifications. Additionally, ensure that you follow proper safety precautions when working with electronics, especially when dealing with power supplies and high voltage components.


  • Assemble this circuit on a good quality PCB.
  • Use 18V DC dual power supply for powering the circuit.
  • Fit the ICs with adequate heat sinks.
  • Connecting 10K POTs at input lines will serve as a volume control.
  • For full output power the circuit require 200mVpp RMS input.

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