Thursday, March 25, 2021

100W RMS Audio Amplifier using TDA7294 IC + PCB

Fig. 1 - Printed Circuit Board Amplifier 100W with TDA7294

We'll assemble an excellent power amplifier, with excellent sound quality, with 100W RMS output power, with symmetrical power supply. The circuit has a wide range in the supply voltage, and we will be providing the printed circuit board for you to download.

Integrated Circuit

The TDA7294 is an Integrated Circuit with Class AB audio output, it has its Multiwatt encapsulation. It was specifically designed for high quality sound applications, such as: home micro-systems, guitar cubes, high-end televisions. 

Thanks to the wide voltage range and the high current capacity, it's able to provide the highest power in loads of 8 ohms or 4 ohms, even with low supply voltage input, with high voltage rejection circuit.

The built-in locking function with activation delay simplifies remote operation, avoiding noisy changes when pressing the On/Off button.


  • Wide range of supply voltage (± 10V to ± 40V)
  • DMOS output amplification step
  • High Output Power (Musical 100W)
  • Mute and Stand-by functions
  • Very low harmonic distortion
  • Short circuit protection
  • Thermal protection with automatic shutdown

The layout of the schematic diagram is just below in Figure 2, for which we have the entire configuration of the amplifier with TDA7294.
Fig. 2 - Schematic diagram 100W RMS Audio Amplifier IC TDA7294

List of materials

  • U1 .................. Integrated Circuit TDA7294
  • R1, R3, R4 .... Resistor 22K (red, red, orange, gold)
  • R2 ................. Resistor 680Ω (blue, gray, brown, gold)
  • R5 ................. 10K resistor (brown, black, orange, gold)
  • C1 .................. Electrolytic capacitor 1.5μF - 35V
  • C2, C3 ........... Electrolytic capacitor 22μF - 63V
  • C4, C5 ........... Electrolytic capacitor 10μF - 63V
  • P1, P3............. 2-Pin Card-to-Cable Connector
  • P2 .................. 3-Pin Card-to-Cable Connector
  • Others ............ Printed Circuit Board, tin, wire, etc.

Power supply

The power supply must be at least 5 AmperesSymmetrical, with good filtration, with a minimum voltage of 10 Volts and a maximum of 40 Volts

Knowing that using the minimum voltage, you will not reach the maximum power of the amplifier, because it needs a higher voltage to supply the declared power.

In this amplifier model, is used a Symmetric Power Supply type, that is; power [+ VCC GND | -VCC].


We are making available for download the necessary materials for those who want to assemble with the PCB - Printed Circuit Board, the files in PNG, PDF and GERBER files, for those who want to send for printing.

Direct link to download

Click in the link below to download the Files: PCB Layout, PDF, GERBER

If you have any questions, suggestions or corrections, please leave them in the comments and we will answer them soon.

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My Best Regards!!!

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