The article is being published in collaboration with JLCPCB. They supply high quality PCBs at a very reasonable price. They also can provide SMT circuit assembly.

We thanks to our sponsor JLCPCB for sponsoring us PCBs for this project circuit.

Thanks To JLCPCB.

$2 for 1-4 Layer PCBs.

Get SMT Coupons:

The TDA2050 is a great sounding chip amplifier with lots of power.  I’ll walk you through the amplifier design process as I build a 25 Watt stereo amplifier with the TDA2050. Before you begin, you’ll want to get an idea of how much output power you want from the amplifier.

The TDA2050 can be powered from a split supply or single supply. The amplifier’s output power will be higher with a split supply, so that’s what I’ll use here

The TDA 2050 is a monolithic integrated circuit in a Penta watt package, intended for use as an audio class-AB audio amplifier.


Component List - 

To make this wireless power transfer circuit, we might need some electronics component.

All components list have been given below –

Component List –

  • TDA – 2050
  • Resistor – 18 k*2, 680 Ω, 2.2 Ω
  • Polyester Film Capacitor – 2A 104J
  • Capacitor - 220µf/25v, 10µf/50v, 1µf/50v
  • Audio Input Cable
  • Power Source – DC 12v
  • Sound Speaker

Pinout - 

The TDA2050 is a Hi-Fi Audio Amplifier IC from ST Microelectronics with a maximum output power of 32W. It has a high operating voltage of 50V compared to the other TDAxxxx series amplifier ICS. It commonly used in class-AB audio amplifier and can drive upto 50W music power into a 4 ohm speaker.


  • High output power (50 W music power IEC 268.3 rules)
  • High operating supply voltage (50 V)
  • Single or split supply operations
  • Very low distortion
  • Available in 5-pin TO220 package
  • Breadboard friendly
  • Supply Voltage rejection: 45dB
  • Can provide up to 50 Watts as output power
  • Voltage Gain: 80dB
  • Output: 28Watts with 4Ω speaker
  • Short-circuit protection (OUT to GND)
  • Thermal shutdown


  • Used for Audio signal Amplification
  • Suitable for high power amplification
  • Capable of operating on dual/split power supply
  • Can be used to cascade audio speakers

Hardware of SMT Project Circuit - 

To make this mini power amplifier circuit, we might need some electronics component. JLCPCB has its own parts library. JLCPCB has 200k+ in stock components, 24 hours rapid SMT assembly. You can check SMT parts library here -

Schematics and PCB Design - 

The schematics of PCBs can be seen above.

Circuit Connection – Step 1

To make this high quality amplifier circuit, 1st we connect 18kΩ resistor with 1no leg of sound IC. Then we make a parallel connection between two resistors. That resistor is 680Ω and 18kΩ. Now connect, it’s parallel point with 2no leg of sound IC and other terminal of 18kΩ resistor with 4no leg of TDA-2050.

The other terminal of 680 ohm resistor is open now. Connect 10µf/50v capacitor with empty terminal of 680 ohm resistor.

Then connect 1µf/50v capacitor positive leg with 1no leg of TDA-2050 sound IC.

We utilize JLCPCB to printout our PCB.

Circuit Connection – Step 2

To make it in a easy way, now we connect a 220µf/25v capacitor and a polyester film capacitor with each other. Now connect this capacitor negative leg with 3no leg of sound IC and the capacitor positive leg will be empty now.

As above, we make a connection between polarity film capacitor and a polyester film capacitor, at the same way we make same connection between these two components.

This time, we connect this capacitor positive leg with 5no leg of sound IC. But at the moment, it’s negative leg will be empty, until we connect it with other components.

Circuit Connection – Step 3

It is...

Read more »