30W Amp OTL by TDA2030 transistor

Relatively easy to build up to 30W Amp OTL by TDA2030 transistor is packed into this project. If you like to listen to music a comfortably ears. Want to create a your power amplifier projects with yourself. This project will direct your heart for sure. By the power dissipation of 20 watts at 8 ohm or 30 watts at load 4 ohm. And easily without any adjustments and Cheap because We use the three tiger army.. Read more ….

The working principle.
As shown figure the circuit, you know 3 soldier that from one IC-TDA2030 and two transistors (TIP41,TIP42 or 2SC1061,2SA761 or BD908,BD907) for helping to extend the signal up there. Part other equipment is useful Likewise. However will explain it to read as follows.

When we enter the power supply and sound signals into this circuit. The capacitor C1 will prevent DC voltage through it. Therefore, the sound signals is at pin 1 of IC1 easily. And This circuit use a single power supply that has two terminals are positive and Ground(negative), So must be connected two resistor R1-56K, R2-56K and C2-47uF to divide the voltage by half. The R3-56K is the result matches the input IC1. ??Gain of IC1 in this circuit is set as High to 14 time. By setting this circuit to the non inverting amplifier circuit or not inverting there.

The OTL amplifier listen comfortably by TDA2030 and TIP41+TIP42

Figure 1. The OTL amplifier using TDA2030 and transistors.

The sound signal output is amplified to pin 4 of IC1 And to boost (increase) to increase with Q1 (TIP41) and Q2 (TIP42). The Q1 which is executing by R6. And The Q2 which is executing by R7. The Q1 and Q2 will start work when the many current flow pass to R6 and R7 so has the voltage drop across them exceeds 0.6V which be bias voltage to Q1 and Q2 there.

The sound signal is amplify from Q1 and Q2 then output to a loud speaker by pass away C8-2,200uF and this circuit can protect the loss of high frequency that output to the loud speaker by R8 and C7.
The D1 and D2 are used to prevent Return the voltage from the speaker not to interfere with the IC1, Q1 and Q2. If none of these two diodes may may be damage the device,including money in your pocket separately. The C7 and C8 is a filter to smooth the power again before it is provided to the circuit there.

PCB of The OTL amplifier listen comfortably by TDA2030 and TIP41+TIP42
The PCB layout

How to build and setting
Familiar with the project is to making a PCB (printed circuit boards) and buying equipment.
For PCB according to Figure 2. The equipment is a device from the list below.
When you has the PCB with a the correct pattern, Next, bring devices to soldered onto the PCB as shown in Figure 3 do.
Soldering equipment onto PCB, should soldering of the device at the low end to high end, will be a beautiful view. Make sure the device is a terminal before soldering. This project uses IC1, Q1 and Q2 should use the big size heat sink to install them with together as shown in figure 2.

Electronic parts
R1,R2,R3_____________________56K 1/4W Resistor +- 5%
R4______________________________3.3K 1/4W Resistor +- 5%
R5______________________________30K 1/4W Resistor +- 5%
R6,R7_________________________1.5 ohm 1/2W Resistor +- 5%
R8_________________________1 ohm 1/2W Resistor +- 5%
C1,C3,C6,C7__________0.22uF 63V__ Polyester Capacitor
C2________________________47uF 25V Electrolytic Capacitors
C4________________________10uF 25V Electrolytic Capacitors
C5,C8___________________2,200uF 50V Electrolytic Capacitors
Semiconductor devices.
D1-D2 _______1N4001 or 1N4002
Q1___________PNP transistor 2SA671 or TIP42 or TIP32 or BD908
Q2___________NPN Transistor 2SC1061 or TIP41 or TIP31 or BD907
Sheets of mica, Cooling pad (Heat sink)

How be used
First need to find the power supply size 24 volt to 30 volt 1 amp, The audio source as the tuner, cassette or a CD player, Finally, a 20-watt 8-ohm the loudspeakers. Then they are connected together. For those who want to listen in stereo, you need to build up the two machines. And need to change the power supply is 2 Amps. It can be used. After this, you will hear the for crystal clear sound from the sound that you created yourself.

This Post Has 22 Comments

  1. It’s really very difficult in this full of activity life to listen news on Television, so I simply use web for that purpose, and obtain the newest news.

  2. Hi , I just did this amp. but this is not true: The sound signal output is amplified to pin 4 of IC1 And to boost (increase) to increase with Q1 (TIP41) and Q2 (TIP42).
    -Q1 is TIP42, and TIP41 is Q2, please be cereful with transistors.

  3. hello the actual size of PCB ?

  4. מחפס לירכוש מעגל אלקטרוני להגברת רמקולים למחשב שיהיה בה מעגל טרבל בס וליום 20wtקיט להרכבה עצמית

  5. Why are all the 2030 amps so wrong? Is anyone able to have the correct schematic for the bridged amp using the tip 31 and tip 32????????

    Someone help. I already bought the components .. Very sad here..

  6. i did this one with a input voltage of 30v but i think the ampere is low (500mA) and the output is getting distortion and i have a 50w speaker 4ohm… what to do ??? i have no idea !!.

  7. – Forget this schematics. If you won cheep and easy build nice amplifier use TDA7294 witch is 90W into 8ohm +/- 30V power supply. I already build one. If you need correct schematic and PCB just e-mail me I’ll send you pictures and all you need.
    – If you won bridge schematic for TDA2030 (35W max into 8 ohm) e-mail me and I’ll send you all you need. [email protected]

  8. Where C5 in PCB ?


  10. I finish my amplifier few day’s ago. Everything working fine , sounds very good , low heat disipation and low distorsion. Using TDA2030A with TIP41C and TIP42C. Transformer is 4A / 24V AC , so 24V x 1.3 = 31V DC and 6800 mF cap. Tested on 4 ohms speaker / 50 W. Great sound ! For any help and pictures: [email protected]

  11. I need PCB Power Amplifier BTL TA8225HQ, for 1 chanel input and 1 output, thank you

  12. hey man this is awesome, it has no distortions. Works like magic!! thanks

  13. i buit this circuit n i faced a new kind of problem.
    i made 2 channels with the same schematic except i used 2.2ohm /0.5W instead of the 1.50hm.
    One of the channel works quite well…very good sound indeed!!!..but for the other channel 2.2ohm resistor from pin 5 is getting fried when i powering the circuit with 24volts 1amp supply with filter cap of 4700uf.
    Plz help me out…m in a serious mess…
    Heres my email:[email protected]
    for any kinda help.
    Thanks to all in advance.

  14. i built this amp but getting distortion any one with a better idea should kindly mail me at
    [email protected]

  15. Im wondering if the pair driver transistors can be replace with TIP3055/TIP2955.Then what the right value for resistor R6 & R7 (1.5R)?I saw TDA2050 + TIP3055/TIP2955 use 10R resistor…Im noob on this calculation etc..I only knw how to read the schematic a little bit…so can the pro help me for the right R on R6/R7?

  16. Fiz um amplificador como o esquema. Más quando alimento ele e ponho no volume maximo, pega fogo no resistor de 1,5ohm, e os dois transistores queimam. Usei TIP31/32.
    Estou alimentando o circuito com +-35v 2a. Seria o problema a tensão de alimentação acima de 30v?

  17. I’ve success made this TDA + Power Transistor curcuit.I use TDA2050 + TIP3055/TIP2955.Single supply setup at 48VDC/3A for the curcuit.I use 2pcs 24VDC/3A + 24VDC/3A ITE adaptor in series.
    Base on standard TDA2050 single supply schematic.Added 10 Ohm 2Watts X 6pcs on parallel for (1.66 Ohm).All 12pcs 10 Ohm 2 Watt for both ground and positif rail.Output capasitor i use 50v/2200uF X 2pcs also on parallel to get 4400uF for speaker out.
    Sound awesome the bass impact with woofer 6.5″ x 2 pcs on series to get 8 Ohm config.I use 2 pcs altec lansing VS4621 woofer.Make my glass windows in my room rattt…krrr.rrr….krrrr….shaking on 70% > volume up.!! 😀

  18. Zadt_Protuner please send PBC with me, thank you !

  19. Dude…
    Actually i make my TDA2050 + TIP3055/TIP2955 curcuit,single supply setting on VEROBOARD. 😀
    If you want a schematic(Diagram) maybe i can help you.But if for PCB,i guess i can’t!So sorry 🙁

  20. On TDA2030 + power transistor above..What does C6 do to this curcuit?Im noob any explaination?my power resistor (R6) on PNP got overheat by adding C6.So i remove it then it balance on both power resistor (R6) and (R7).Im bit comfuse on this,Do i make anywrong connection?I follow the schematic above..C6 make problem on my curcuit,why?

  21. “By setting this circuit to the non inverting amplifier circuit or not inverting there”. what is the meaning

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