Circuit 32w hi-fi audio power amplifier – TDA2050

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The TDA 2050 is a monolithic integrated circuit in Pentawatt package, intended for use as an audio class AB audio amplifier. Thanks to its high power capability the TDA2050 is able to provide up to 35W true rms power into 4 ohm load @ THD = 10%, VS = ±18V, f = 1KHz and up to 32W into 8 ohm load @ THD = 10%, VS = ±22V, f = 1KHz. Moreover, the TDA 2050 delivers typically 50W music power into 4 ohm load over 1 sec at VS=
22.5V, f = 1KHz.
The high power and very low harmonic and crossover distortion (THD = 0.05% typ, @ VS = ±22V, PO = 0.1 to 15W, RL=8ohm, f = 100Hz to 15KHz) make the device most suitable for both HiFi and high class TV sets

  • High output power
  • (50w music power IEC 268.3 rules)
  • High operating supply voltage (50v)
  • Single or split supply operations
  • Very low distortion
  • Short circuit protection (out to Gnd)
  • Thermal shutdown


The TDA 2050 has an original circuit which limits the current of the output transistors. The maximum output current is a function of the collector emitter voltage; hence the output transistors work within their safe operating area. This function can therefore be considered as being peak power limiting rather than simple current limiting.
It reduces the possibility that the device gets damaged during an accidental short circuit from AC output to ground.


The presence of a thermal limiting circuit offers the following advantages:
1)An overload on the output (even if it is permanent), or an above limit ambient temperature
can be easily tolerated since the Tj cannot be higher than 150°C.
2)The heatsink can have a smaller factor of safety compared with that of a conventional circuit. There is no possibility of device damage due to high junction temperature. If for
any reason, the junction temperature increases up to 150°C, the thermal shutdown simply reduces the power dissipation and the current consumption.

Schematic of Amplifier with TDA2050

Schematic of Amplifier with tda 2050Suggested PCB for TDA2050 Amp

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TDA2050 amp PCB
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TDA2050 amp PCB board

List of components for assembly of the amplifier tda2050

Component Value
C1 2.2µF – Electrolytic or polyester capacitor
C2 100µF – Electrolytic capacitor
C3, C7 1000µF – Electrolytic capacitor
C4 22µF – Electrolytic capacitor
C5 100nF (104) – Ceramic capacitor
C6 0.47µF – Polyester capacitor
IC1 TDA2050
INPUT Connector Audio Input
POWER Connector Power supply
Output Connector Audio Output
R1, R2, R3, R5 22k
R4 680 Ohms
R6 2.2 Ohms /1 Watt
  • The power supply for this circuit should be 12 to 45 volts / 2 amps
  • Requires a heatsink and the power supply must be DC voltage. You can use notebook power supply
  • Capacitor voltage
    • Power supply < 18V = Capacitors 25V
    • Power supply < 25V = Capacitors 35V
    • Power supply < 40V = Capacitors 50V
    • Power supply 40 at 45V = Capacitors 63V

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42 thoughts on “Circuit 32w hi-fi audio power amplifier – TDA2050”

    • Hello Aman

      Power supply < 18V = Capacitors 25V Power supply < 25V = Capacitors 35V Power supply < 40V = Capacitors 50V Power supply 40 at 45V = Capacitors 63V

  1. saya pernah bikin power amplifier sub TDA 7294.tapi kok suaranya kecil banget.bassnya gak bisa keluar.
    saya dari Indonesia.thank

    • Comment:
      saya tahu..dalam pemasangan part ada yang salah sehingga gain tidak keluar suara,
      cek polaritas part anda, jangan sampai terbalik

      to choleke kenter

  2. You actually make it seem so easy with your presentation but
    I find this matter to be really something that I think I
    would never understand. It seems too complicated and extremely broad for me.

    I am looking forward for your next post, I’ll try to get the hang of it!

  3. Hi, i bnuilded it and it don’t works and i don’t know why. PCB is clean, pins are ok and as supply i’m using 24v old notebook power supply. I can’t hear anything in the speaker. TDA or any differnt component don’t heat. At first start i added fuse 3,5A and it doesnt blow so theres not problem. Can you help me please??

  4. Hello to all who come to this page to build your audio amplifier. I have tested this circuit. and let me tell you that is a mistake. The PCB is in no way mirror. printed as well, to work, the TDA2050 I will have to put on the side of the tracks. and to prove it, see the datasheet of the TDA2050. In the Pin1 is the audio input. And when they finish the PCB is in Vs Pin1 +.
    Luck …

    • ohh please its fine flip the image so that u can read the pcb words correctly i.e the +ve and -ve and xtronic read correctly and there u go…………use paints to flip the image horrizontally then rotate +180……..good luck

  5. Hola a todos los que lleguen a esta página para construir su amplificador de audio. Lo he probado a este circuito. y dejenme decirle que tiene un error. El PCB no está en modo espejo. si lo imprimen así, para que funcione, el TDA2050 lo tendrán que poner del lado de las pistas. y para corroborarlo, vean el datasheet del TDA2050. En el Pin1 va la entrada de audio. Y cuando terminen el PCB, el Pin1 queda en Vs+.

  6. Hola capo muy bueno una pregunta funciona con 12vcc? me podes mandar al correo el PCB para imprimir? gracias muy bueno!!!!!


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Crash Course Electronics and PCB Design
Crash Course Electronics and PCB Design
DC circuits, operational amplifiers, EXERCISES, SIMULATIONS
DC circuits, operational amplifiers, EXERCISES, SIMULATIONS