Monday, January 24, 2022

14.4V, 70W High Efficiency Power Amplifier using TDA1562Q IC + PCB

Fig. 1 - 14.4V, 70W High Efficiency Power Amplifier using TDA1562Q IC + PCB

The original project: Click Here!

This is a high efficiency and high power amplifier, powered by a simple 14.4V power supply, can provide a power of 70W in , using the TDA1562Q Integrated Circuit.

The TDA1562Q IC is a monolithic Class H power amplifier in Bridge-Tied Load (BTL) mode in a 17-lead DIL-folded-SIL plastic package.

The device can be used for general-purpose audio systems, however, given its low operating voltage, between 8V and 18V.

We can use it in: Car Sound, Subwoofer Boxes, as well as applications powered by a DC power supply connected to the mains, such as: speaker system, guitar amplifier, TV Sound, or in portable audio like Boombox, Etc.


  • Very high output power, operating from a single low supply voltage
  • Low power dissipation, when used for music signals
  • Switches to low output power at too high case temperatures
  • Few external components
  • Fixed gain
  • Differential inputs with high common mode rejection
  • Mode select pin (on, mute and standby)
  • Status I/O pin (class-H, class-B and fast mute)
  • All switching levels with hysteresis
  • Diagnostic pin with information about:–  Dynamic Distortion Detector (DDD)–  Any short-circuit at outputs–  Open load detector–  Temperature protection.
  • No switch-on or switch-off plops

The Schematic

In Figure 2 below we have the schematic diagram of the High Efficiency Power Amplifier circuit and we can follow and analyze all the simplicity of the circuit, and as we can see, it is a circuit of easy assembly, and with few external components.

Fig. 2 - Schematic 14.4V, 70W High Efficiency Power Amplifier using TDA1562Q IC

Power Supply

This amplifier is powered by a simple positive and negative voltage type power supply, and has a supply voltage range that varies with a minimum voltage of 8V and a maximum voltage of 18V, the typical unstressed working voltage of the Integrated Circuit is 14.4V

The power supply should have a current of at least 5 Amperes, to be used in mono mode, if mounting in the stereo, "two channel" version, the current should be doubled, and should also be provided with good filtering to avoid ripples in the system, which can cause noise in the amplifier.

The impedance of this amplifier to reach its full power is , however we can set it to , however we will not get the maximum power of the amplifier.

Component List

  • Semiconductors
    • CI1 ............ TDA1562Q Integrated Circuit 
    • LD1 ........... LED Light Emitting Diode

  • Resistors
    • R1 .............. 1MΩ resistor (brown, black, green, gold)
    • R2 .............. 10KΩ resistor (brown, black, orange, gold) 
    • R3 .............. 5.6KΩ resistor (green, blue, orange, gold)  

  • Capacitors
    • C1, C2 ....... 470nF Ceramic / Polyester Capacitor
    • C3 .............. 10uF / 63v Electrolytic Capacitor
    • C4, C5 ....... 4700uF / 25V Electrolytic Capacitor
    • C6 .............. 100nF Ceramic / Polyester Capacitor
    • C7 .............. 2.200uF / 25V Electrolytic Capacitor

  • Others
    • P1, P2, P3 ... Screw Terminal Type 5mm 2-Pin Connector
    • Others ......... Heat sink for IC, wires, connectors, PCB, tin etc.

Printed Circuit Board

In Figure 3, we provide the PCB - Printed Circuit Board, in GERBER, PDF and PNG files. These files are available for free download, on the MEGA server, in a direct link, without any bypass. 

All to make it easier for you to do a more optimized assembly, either at home, or with a company that prints the board. You can download the files in the Download option below.

Fig. 3 -  PCB 14.4V, 70W High Efficiency Power Amplifier using TDA1562Q IC

Files to Download, Direct Link:

Click on the link beside: GERBER, PDF and PNG files

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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