Amplifier Circuit Diagrams

Power Amplifier Circuit – 25 Watts Schematic Circuit Diagram

The 25-watt audio power amplifier circuit has been created utilizing the ST IC TDA 2040, which is a 25-watt hi-fi audio power amplifier. This IC is monolithic and comes in a compact petawatt V package, minimizing PCB space usage. It functions as a Class AB amplifier.


Here is a schematic diagram of a 25-watt power amplifier circuit featuring the TDA2009 IC. The TDA2009 IC is a hi-fi Class AB stereo amplifier enclosed in a multi-watt package. It’s essentially a dual audio power amplifier designed for high-quality stereo applications. The TDA2009 is commonly used in amplifier circuits due to the readily available and cost-effective electronic components associated with it. This IC incorporates two identical amplifiers, each capable of delivering 12.5 watts per channel at a 4-ohm load. In this configuration, the two channels are bridged to create a single output channel with a power rating of 25 watts.

TDA 2009 IC has also built-in features such as short circuit protection, thermal protection, overload protection, etc using very low external components. The most interesting factor I see about this IC is that it does not require a dual supply.

Components List

Power Amplifier Circuit Diagram and Power Supply Circuit Schematic

Power Amplifier Circuit Diagram and Power Supply Circuit Schematic

TDA 2009 Power Amplifier Supply

TDA 2009 Power Amplifier Supply Schematic Circuit Diagram


  • Do not connect more than 24 V to TDA2009.
  • If a 5-ampere bridge is not available make one using four 5 A diodes.
  • Fit a proper size heat sink to TDA2009
  • Do not operate the circuit without a heat sink.
  • For volume control connect a 10K pot
  • All capacitors in this circuit must be rated above 25 V.
  • Capacitors with + mark are electrolytic and that lead will be positive. Other capacitors will be normally ceramic. If there is an exception that will be given there in the circuit or parts list. This law applies to all circuits on this site.

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