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TDA2822

TDA2822 Stereo Audio Amplifier Circuit

TDA2822 is a low power stereo Op Amplifier used in Walkman players and Hearing aids. It can give 250 mW output. TDA2822 is an ideal Op amp for low output applications. It is a good choice as a preamplifier in stereo high power amplifier circuits. It has two inputs and two outputs which can deliver 250 milli watts output power. The amplifier circuit with in the IC is well set for noise free operation. Outputs can be directly coupled to the speakers through the decoupling capacitors.

TDA2822 audio amplifier circuit diagram

49 Comments

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  • Anirvan

    how to make a mono amplifier with 2822 and get 1watt output

    • Vinod

      Hi Anirvan,
      connect pin 6 to ground. connect mono input to pin 7. avoid C1 and connect 10uF cap ‘s positive to pin 8 and negative to pin 5. connect 10nF cap to pin 5 and connect other end of 10nF to ground. conect the speaker to pin 1 and pin 3. Avoid C2 and C3. Last but not least, connect a 10 uF cap’s positive to pin 2 and negative to ground. Feed 6 volt and connect 8 Ohm speaker. You will get 1.35W mono output.

  • akash

    hii sir…. I m working on building amplifier which recieves input from my phone and feeds them into a small 2″ speaker povered by 9 v battery….
    I connected the circuit but am not understanding 1 thing…
    I bought a new earphone and removed its wires..(coz such wires are not available in my area) then i stripped the insulation of left earphone.. I got tho wires inside..
    I m not understanding where to connect those wires to input of amplifier …. So please comment on how to give inputs to that amplifier…
    I mean…. I got 2 wires…. One red and one copperish colour…on breaking left earphone…. And other 2 wires… Red and coppr again… An breaking right earphone… amp circuit diagram says that red of left earphone to be given to pin 6 and red of right earphone to pin 7… What to do of remaining two copper wires??

    and we have to give negative of 9 volt battery to pins 5&8?

    • Vinod

      Hi Akash,
      No do not connect negative to 5 &8. Please connect the negative to c1’s negative side and pin 4. And you will get better result if you change c2 & c3 to 470uF.

  • Akash

    Dud…. I m working on building amplifier which recieves input from my phone and feeds them into a small 2″ speaker povered by 9 v battery….

    I connected the circuit but am not understanding 1 thing…
    I bought a new earphone and removed its wires..(coz such wires are not available in my area) then i stripped the insulation of left earphone.. I got tho wires inside..
    I m not understanding where to connect those wires to input of amplifier …. So please comment on how to give inputs to that amplifier…
    I mean…. I got 2 wires…. One red and one copperish colour…on breaking left earphone…. And other 2 wires… Red and coppr again… An breaking right earphone… amp circuit diagram says that red of left earphone to be given to pin 6 and red of right earphone to pin 7… What to do of remaining teo copper wires??

    • Vinod

      Hi Akash,
      Do you have a digital multimeter with you ?. If so Please turn the button of that DMM into continuity testing mode. And touch one probe to the nib of the earphone pin. On the same time touch the other probe to all of four wires one by one. When the buzzer beeps, that’s your left channel positive wire. Then touch the probe to center of the earphone pin. touch the other probe to the rest of the wires on by one. When buzzer beeps, that’s your right channel positive wire. Last but not least, touch the probe to the plastic side end of that earphone pin. And touch the other probe to rest of the wires. When buzzer beeps, that’s your ground wire. If your pin had 4 separated parts, then the fourth part should be a mic input.

    • akash

      thanks!!

      my TDA 2822 became too hot after an hour of using it…..so i want to know which amp is small in size but provides undistorted o\p with in voltage 3V and above… it should be ultra small and no xternal caps, resistrs etc…..

      and which is best small amp??

  • Silas eletrônika

    Recomendo que seja um capacitor de 470uf na saída, menos que isso o som pode sair baixo.

  • feroz

    this ckt requires a bridge rectifier.

  • romil

    hi
    i just visited this site
    plz help me to make 2 channel portable amplifier with voltage supply of 3.7
    volt by mobile battery.
    with volume & bass tunning by pot.
    thnx.

  • Jim Keith

    If you are referring to the capacitor voltage rating, it is not critical–just make it at least 2 * battery voltage or so–so a range of 15 to 63V is good–even 100V is OK.

  • brad

    can it be lower or higher

  • brad

    hi does it have to be exactly 25v can it be lower

  • vinod

    Hi, I made a usb amplifire with this IC and it is working successfully. And now i am planning to make a hearing aid with this chip.
    -vinod chandran

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