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  • This audio amplifier circuit delivers up to 200 W of top-class quality for loudspeaker from 4 to 16 ohm. Operating voltage is between 24 and 36 V, max 5 A. The frequency response is from 20 to 20000 Hz.
    Please take special care that the transistors and the IC’s have been fixed firmly and solely one or two separated cooling elements with sufficient dimensions for this purpose (thermal resistance < 1K/W).

    Doing so it is necessary to mount the transistors and the IC’s insulated (with mica washes and plastic nipple). Please make sure before first operation that the transistors and the IC’s really do not have any electrical connection towards the cooling plate! The transistors have to be placed plane and firmly onto the cooling element! It is of extraordinary importance with this high-power amplifier that there is a considerable heat dissipation. The already mounted cooling element should be situated in a well ventilated case.

    200W Power Amplifier Circuit Schematic

    The PSU should be sufficiently powerful, power consumption of the amplifier may increase up to 5A. In case of using an unstabilised power supply. It is advisable to place a transformer of max 28V.

    The amplifier will the show approx. 120W at a 4-Ohm loudspeaker, for it no-load voltage of the power supply will not be to high. If it is desired to use complete power, it is necessary to place a stabilised power supply with approx. 36V 5A. No-load voltage should not pass over 44V!
    The cables leading the current supply and to the loudspeakers should have at least a cross section of min. 1.5 mm^2. The connected loudspeaker have to be equiped according to the high output power and should not have a lower impedance as 4 Ohm! With lower connection impedance and short circuit within the loudspeaker wiring, the transistors will be destructed.

    The amplifier has an input sensitivity of approx. 500 … 800 mV. Therefore, it is possibile to connect directly at the amplifier tape decks, tuners, etc. In case there are connected signal sources with lower output voltage, it is necessary to pre-connect a preamplifier. Then it will alse be posible to connect microphones, etc.

    200W audio amplifier PCB

    Audio power amplifier components

    IC1, IC2 = 2 IC’s TDA2030
    T1, T3 = 2 transistors KT818 or BD708
    T2, T4 = 2 transistors KT819 or BD705
    C1, C2, C3, C4, C7 = 5 capacitors 150 nF
    C5 = 1 elca 10uF 63V
    C8 – 1 capacitor 1.8 nF
    R1, R7, R9 = 3 resistances 100K
    R2, R3, R10, R11 = 4 resistances 2.2 Ohm
    R4, R5 = 2 res. 2K
    R6, R8 = 2 res. 1 Ohm
    R12, R13 = 2 res. 2 res. 3.3K
    D1…D4 = 1N4001, 1N4002, 1N4003
    1 PCB board approx 56×51 mm

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    68 Responses to "200W Transistor Audio Amplifier Circuit"

    1. Please help me to make a jammer for audio sound system/amplifier/mixer/speaker , jamming by radio transmitter

    2. kindly specify the wattage rate of the resistors and what kind of capacitor to be used…its my first time to make an amplifier but i understand how the components work…thanks..

      • I’m a newbie and we are having a project:any schematic electronics with IC(without program) and Transistors present. i just wanna ask if the IC of this projects has program?

    3. i would like to make a booster amplifier…can you help me on how to build it…thanks a lot…

    4. wats d max output wit a 4ohm speaker??

    5. JaNsRex says: on May 29, 2009 at 3:18 am

      cna my guitar pre-amp drive with this power amplifier?……….

    6. JaNsRex says: on May 29, 2009 at 3:18 am

      can my guitar pre-amp drive with this power amplifier?……….

    7. claudio says: on June 25, 2009 at 8:13 am

      Sorry I have a doubt, the basis of the resistance of 2.2 ohms transistores son? or 2.2 k

    8. I was wondering, is there a way to bridge this curcuit, as in make it one mono amplifier?

    9. I think that’s a BTL power amp.
      I am never been trying that but I hope the sound is excellent.

    10. djdidz of kai karaoke says: on October 27, 2009 at 11:54 pm

      i didnt even try this circuit,as i doubted the power output transistor,does it really deliver a 200watts rms into 8 ohms speaker?

    11. djdidz of kai karaoke says: on October 27, 2009 at 11:56 pm

      can you give me some idea on how to remain safe the power output transistors when speaker is shorted?thanks

    12. djdidz of kai karaoke says: on October 28, 2009 at 12:02 am

      based on my experienced in audio design,at least 50% of maximum power dissipated by power transistor is allowed for best results can you explaine furthere why single power transistor only in power output?i mean 1 pair only.

    13. djdidz of kai karaoke says: on October 28, 2009 at 12:04 am

      aw,sory for my previous messages i understand already the circuits i think works.

    14. what website would be recomemended for buying most of these components? thanks

    15. what will i use one of these diodes for d1 to d4

    16. Emmanuel Darko says: on December 25, 2009 at 3:51 pm

      please iam of gem power amplifier circuit thank you

    17. Blueice23 says: on December 28, 2009 at 2:06 am

      I made this amplifier last year and it can really deliver 200W of output power. I was able to pre-test the amplifier using electronic workbench software before making the actual circuit. If you want to make your own lay out for the circuit board please make sure that the power tracks are far from the signal carrying ones as it oscillates and may damage the TDA2030 ICs.

    18. Is this amplifier output 200w rms or 200w peak to peak?
      I have allready bild it on my ruster butt I did not test it yet..

    19. Question 1: What are the specific wattage of all the resistors stated above?

      Question 2: The capacitors C1, C2, C3, C4, C7 and C8 what also the specific voltages for each.

      I want to build this amplifier, what is the common substitutes for BD7xx or KT8xx transistors if they are not available in the electronic shops?

      Help me please….


      • BULUMA ENOCK says: on May 20, 2010 at 4:07 pm

        May 20, 2010 at 4:00 pm
        TI$T3 KT818 OR BD708.T2,T4 KT819 OR BD705, are no where to be seen in kampala and jinja.uganda. which transistor can i use in place of those one npn $ pnp?

    20. You can use BD249/BD250. But anyway this schematic is obsolete and will not put out 200W anyway, or at least it won’t do it without burning the transistors.

    21. Thanks man… but anyway another thing,
      what are the specific wattage of all the resistors stated?
      and the capacitors C1, C2, C3, C4, C7 and C8 what also the specific voltages for each???

      thanks in advance…

    22. How can you make a amlifier deliver 200W when the TDA 2030 can reach only 15W??????????/ Ezplain that to me,Blueice23 ! U better use a hybrid scheme with 4x2n3055

    23. Hi, everyone, I have built this amp few monts ago.
      It is realy capable of delivering about 150 to 200 W of RMS power.
      But at frequencyes lower than about 350 Hz it has huge distorsion and it is awful for reproducing good bass.
      Speaker sounds like someone is scratching it (osciloscope can show why it is so).
      Of course it may require some fine tunning of R and C components, but original schematic is quite useles.

    24. BULUMA ENOCK says: on May 20, 2010 at 4:00 pm

      TI$T3 KT818 OR BD708.T2,T4 KT819 OR BD705, are no where to be seen in kampala and jinja.uganda. which transistor can i use in place of those one npn $ pnp?

    25. i need the symbols in the daigram above

    26. Pentode says: on June 16, 2010 at 8:38 pm

      the diodes should be UF5804 (Ultra Fast diodes), 1N4000 series diodes have a maximum speed of 10khz!

    27. SEETHARAMAN says: on June 21, 2010 at 3:33 pm

      Hi I have assembled this with 2N3055 and 2N2955 plastic version. Theorotically this circuit has to give an output around 144 watts RMS power with 4 ohms speaker. Practically I could get around 120watts into 4 ohms with 36volt 5 amps power supply(+ -20 volts regulated). and 60 watts into 8 ohms load. I have to use 10000uF capacitors for positive and negative power supply. Filter capacitors and bridge rectifier should be close to power transistors and IC. The standing current is quite high around 200mA hence you require a very good heatsink.

    28. gimneltampos says: on July 25, 2010 at 1:23 pm

      what is the desired voltage source?

    29. Kwabla Daniel Teye says: on October 25, 2010 at 8:37 pm

      Help help me build a power supply for the amplifier.also can you give me equivalents of the BD transistors because i cannot get them to get.

    30. alain margarico says: on November 30, 2010 at 8:18 am

      are you sure this amoplifier will work?

    31. tasos says: on May 3, 2011 at 2:17 am

      please specify the wattage of the resistors…would standard 1\4w do?

    32. vic silay says: on May 22, 2011 at 7:32 pm

      pls.kindly specify the wattage of resistor..r2-r3-r10-r11 2.2 ohm of 200w project thanks more power

    33. what is the voltage supply of this amplifier? and what are the needed tone control? also the replacement values of the transistors because i did not find them? and i what to see also the whole output or the picture of this amp.

    34. G vchakravarthy says: on October 23, 2011 at 12:59 pm

      i want audio amplifier ckt
      G V Chakravarthy PH No 8179222958

    35. i am just curious if where is the input and output of this type of amplifier,, can anyone tell me? well i just want to have one.. THANK YOU :)

    36. nice diagram. I hope I can assemble also this Power Amplifier but I have difficulty on locating the Power Supply Line and Output.

    37. dear
      thank you for providing good circuit diagrom of amplifier
      but i have some question
      1} where is the out put point
      2}there is no c6
      3} what is RL .in this circuit

    38. I rilly love what u guys are doing, kip it up.pls can anyone help me with where to connect a tone control in an amplifier circuit

    39. Can BD241 /BD244 work in place of BD705/BD708 i can’t get them here in jos nigeria.

    40. the input is at left the loudspeaker is the output be careful the i.c. is running on max discrete amp needed for higher power I did a pa for five hundred people in the open with ONLY 5 WATTS stereo per channel

      • Jim Keith Jim Keith says: on July 23, 2012 at 4:09 pm

        Atree–few realize what low power can do with an efficient speaker system.
        200W is for bone jarring bass…

    41. Thank you sir for this 200watts amplifier diagram,i’ve made it and it work’s fine,very good and high quality audio amp.you can use this transistor (TIP36A:TIP36B:TIP36C for T1 and T3.and for the T2 and T4 replacement are (TIP35A ; TIP35B ; TIP35C, well and tested! because i’m using it….

    42. sir what is the wattage of all resistor

    43. sir can i used 24-0-24v,6A transformer? for thius circuit? pls reply soon

    44. thanks for your reply,,ill try to build this circuit…
      Best regards

    45. Sir, as per PCB circuit diagram there’s RL located at the left side…Thus RL is OUTput? or input?
      Please reply me soon.

    46. Sir can you please send me circuit diagram for power supply of this amplifier.

      • Jim Keith Jim Keith says: on November 3, 2012 at 2:46 pm

        The power supply is very simple. Either full-wave bridge or full wave center-tapped with an input capacitor of at least 47,000uF. Use 6A lead-mounted rectifiers.

        You must scrounge for a suitable transformer or spend in excess of $130 for one from DigiKey or $80 from Newark/Farnell.



    47. Gud day to you sir,please specify me the voltage of all capacitors.thank u.

      • Capacitor voltage ratings are 100V minimum except that the electrolytic is already specified at 63V.
        The lower capacitor (C5) is a misprint–it must actually be C8.

    48. I want a powerful amp which has mic input and a line in which can produce good sound from 12 inch big speaker getting input from a line in so that i can use small devices to give input such as mobile. I hope you could help me out. It can use transistors or ic no problem.

    49. First & foremost, I want to appreciate your effort on this simple but wonderful 200watts amplifier and your good gesture. Thanks very much indeed.

    50. RAphael Adepoju says: on February 5, 2014 at 2:35 pm

      Pls sir for R2;R3;R10;R11,the value is 2.2ohms OR 2.2Kohms?

    51. Winston Dias says: on February 14, 2014 at 4:52 pm

      Where is the capacitor C8? What would the capacitor C6? Thank you.

    52. please send me a schematic diagram in making a 35volts power supply…thanks.

    53. Is there any way to put a volume knob ??

    54. I build this amp but the output transistor and the ic at the input channel was over heating and there’s no output but a loud hum. Please help me solve this issue.

    55. I have solve my problem now but there’s another thing again. The output is distorted, how can I deal with this? I am satisfied with the strength of its output, but its distortion was only my problem. Can you please help me….. I’d use mylar cap coz there is no polyestyrene cap here.

    56. sir…. were is the c6??????? Thn sir this crcuit has a bias adjustment??????

    57. Sekyanzi Marvin says: on December 6, 2014 at 9:26 pm

      Yes Thanx alot fof this but if am to use this on my PC can amplify my music?

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