Brutus – Circuit Audio power Amplifier stereo with tda7294 bridge 2x 170 Watts (more 300 + watts total)

The circuit of the amplifier with TDA7294 was a big hit among our readers, so bring more than this version of the amplifier with TDA 7294 “Brutus,” this is an application bridge to the tda7294 that can provide up to 170 Watts @ 8ohms, 38 VDC.tda7294 bridge stereo amplificador 450x360 Brutus   Circuit Audio power Amplifier stereo with tda7294 bridge 2x 170 Watts (more 300 + watts total)

The integrated circuit TDA7294 developed by SGS Thompson (www.st.com), allows you with little money, a lot amp complete, it is designed as audio amplifier in class AB and is ideal for use in systems Home Theater High-quality amplifiers and easy assembly. He is able to work with loads (speakers) of 4, 8 and 16 Ohms. He is capable of delivering 100 Watts @ 4ohms, VS = +-29V, 100 Watts @ 8ohms, Vs = +-38V. The total distortion is only 0.1% PO = 0.1 to f = 50 Watts 20Hz to 20KHz.

In this version of Bridge or Bridge amplifier, keep in mind the impedance of the speakers! 8 Ohms is the minimum recommended is 16 ohms using only voltage up to +-38Volts.
R = 8 Ohms  VS =+-25V, PO = 150 Watts
R = 16 Ohms Vs = +-35V, Po = 170 watts

You can use up to 4 Ohms, but the system of IP protection will take action and reduce the maximum power for a safe bet!

Diagram of Brutus – Schematic circuit amplifier with TDA 7294 – 170 Watts x2 – click for enlarge

tda7294 bridge esquema amplificador 440x450 Brutus   Circuit Audio power Amplifier stereo with tda7294 bridge 2x 170 Watts (more 300 + watts total)

The circuit is divided into two main parts of the power supply and power amplifier.

Power supply for Brutus – The power consists of a transformer of 250VA @ 22-0-22 to 28-0-28, The bridge rectifier should be a GBU15G, the capacitors of the source can be provided to 4700μF/63V 22000μF / 63V, if you use a source of maximum + -28 volt operating voltage of the capacitor can be 50V. There are also two capacitors and two resistors polyester, the function of these resistors is to unload the large electrolytic capacitors, when disconnecting the circuit. The fuses are to give additional protection for the circuit, do not forget to add a fuse before the transformer.

Power Amplifier – Part of the amplifier is configured to work in stereo bridged using 4 integrated circuits, resistors R4, R7 (R) and R20, R17 (L) determine the gain of the circuit with these components is configured to 30 dB. The circuit mute / stand-by is connected directly to the DC circuit, if you can add a switch to toggle between silent and active. The input impedance is determined by resistors R9 and R22.

Suggested PCB mounting Brutus – bridged stereo amplifier 2 x 170 Watts (300 + watts total) – click in images for enlarge

tda7294 ponte pci amplificador 450x212 Brutus   Circuit Audio power Amplifier stereo with tda7294 bridge 2x 170 Watts (more 300 + watts total)

PCB - Bottom Side for power amplifier - click to enlarge

tda7294 bridge layout amplificador 450x211 Brutus   Circuit Audio power Amplifier stereo with tda7294 bridge 2x 170 Watts (more 300 + watts total)

PCB Component side - click to enlarge

tda7294 bridge silk amplificador 450x215 Brutus   Circuit Audio power Amplifier stereo with tda7294 bridge 2x 170 Watts (more 300 + watts total)

Silk screen component - click to enlarge

The printed circuit board assembly is suggested for this single-sided, mainly to facilitate the lives of beginners … but if there is one face has Jumpers! It should connect pieces of wire, connecting the dots in red is the source + VCC.

 List of material to mount the amplifier in bridged Brutus

Part Value
Resistor’s 1/4 Watts 5%
R1, R2 4k7 – Yellow, Violet, Red, Gold
R3, R4, R16, R17 680 – Blue, Gray, Brown, Gold
R5, R6, R7, R18, R19, R20 22k – Red, Orange, Orange, Gold
R8, R9, R21, R22 12k -Brown, Red, Orange, Gold
R10, R12, R23, R25 27k – Red, Violet, Orange, Gold
R11, R13, R24, R26 100k -Brown, Black, Yellow, Gold
R14, R15, R27, R28 47k – Yellow, Violet, Red, Gold
Capacitors
C1, C8, C11, C13, C19, C21 1µF/100V – Polyester film capacitor
C2, C10 100nF/250V – Polyester film capacitor
C3, C4, C6, C7 10000µF/63V – Polarized electrolytic capacitor
C5, C9 1000µF/63V – Polarized electrolytic capacitor
C12, C14, C15, C16, C17, C18, C20, C22, C23, C24, C25, C26 22µF/63V – Polarized electrolytic capacitor
Semiconductors
IC1, IC2, IC3, IC4 TDA7294V – Integrated Circuit Audio Amplifier
D1, D2, D3, D4 1N4148 – semiconductor diode
B1 GBU15G – 400V/15A rectifier or equivalent
Miscellaneous
F1, F2 8 Amp Fuse
IN Audio input connector
L-OUT Connector Left Channel audio output
R-OUT1 Connector Right Channel audio output
TRAFO Connector to the transformer 22-0-22 to 28-0-28 (16 Ohms)
Solder, wire, printed circuit board, heat sink for integrated, bolts, box, etc.

Download the PDF files to mount stereo amplifier Bridge: Silk Screen, PCB, PCB component side, Silk screen, TDA7294 Eagle Library, TDA7294 Datasheet

Users electronic tags:

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Filed Under: AmplifierAudioCircuits

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About the Author: Xtronic.org blog author. Electronics technician for the technical school of Brasilia - Brazil. Interested in electronics, circuits and technology in general.

RSSComments (35)

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  1. Amox says:

    Toni I would like you to send for me pdf files for this project.
    Am more interested in building this for my mini PA amplifier.
    Thanks.

  2. mazoyer says:

    bonjour ne peux ouvrir en pdf merci envoyer dimensions du pcb.
    salutations

  3. Manish says:

    hi, i made this amp but its not staring… should i know why it is not starting…

  4. Asthalavista says:

    please…if possible could you design me a 5.1 channel circuit using the njw1186 processor…
    if possible send me via my email dasthalavista@gmail.com. PCB layout,part list n components layout will much be accepted

  5. mas_koe says:

    help me pdf file for this pcb sir

  6. Jeo says:

    Sir.
    the project is very nice and cool, i want to plead that you made a mistake listing the parts, the 22k resistor color code should be Red-Red-Orange not Red-Orange-Orange.
    once again thanks for this projects….it quality is amazing.

  7. Chelford says:

    Can u give me a complte details about this project i cant download the pdf thanks…

  8. haerul says:

    please send me the file
    thank you

  9. crisanto says:

    i am not able to download the PDF files for
    Silk Screen, PCB, PCB component side, Silk screen, TDA7294 Eagle Library, TDA7294 Datasheet.

    Would you mind to send me the file Via email ?
    Thankyou very much.

  10. Awie says:

    i am not able to download the PDF files for
    Silk Screen, PCB, PCB component side, Silk screen, TDA7294 Eagle Library, TDA7294 Datasheet.

    Would you mind to send me the file Via email ?
    Thankyou very much.

  11. Aravind says:

    Hi Toni, Thanks for the wonderful post. I am planning to use this circuit for my Subwoofer but want to make some small changes in the PCB before doing so. Could you please send me the eagle files to my email. Thanks

    Aravind

  12. Marius says:

    Hello,
    I’m very interesting in this project,but I cannot download the PDF file in my area.Would you mind to send me the file Via email?
    Thankyou very much !
    Can you send me PCB for this amplifier TDA7294 2x150W
    on this email kulamario@vodafone.ie

  13. Rick says:

    could you send me the files please?
    thnx alot

  14. joey says:

    do you have stk 4050v pcb layout? can you pls. e-mail it to me

  15. joey says:

    i am very interesting in this project but i cannot download the PDF file.would you mind to send me the file via e-mail?
    Thank you very much.

  16. joda105 says:

    I am not able to download the PDF files for
    Silk Screen, PCB, PCB component side, Silk screen, TDA7294 Eagle Library, TDA7294 Datasheet.

    Would you mind to send me the file Via email ?
    Thankyou very much

  17. ronny says:

    I am not able to download the PDF files for
    Silk Screen, PCB, PCB component side, Silk screen, TDA7294 Eagle Library, TDA7294 Datasheet.

    Would you mind to send me the file Via email ?
    Thankyou

  18. ronny says:

    I am not able to download the PDF files for
    Silk Screen, PCB, PCB component side, Silk screen, TDA7294 Eagle Library, TDA7294 Datasheet.

    Would you mind to send me the file Via email ?
    Thankyou very much

  19. md mahfuz says:

    hi
    i want TDA7294 Datasheet and pcb width and height size.
    please give

  20. md mahfuz says:

    hi
    i want tda7294 bridge 2x 170 Watts amplifier pcb Width and Height size.
    please give me help me

  21. md mahfuz says:

    hello
    i want pcb hide and wide size
    please say the size

  22. md mahfuz says:

    i am not able to download the PDF files for
    Silk Screen, PCB, PCB component side, Silk screen, TDA7294 Eagle Library, TDA7294 Datasheet.

    Would you mind to send me the file Via email ?
    Thankyou very much.

  23. rathish says:

    hi Toni,
    Nice project.
    i am not able to download the file, can you send it me over mail?
    Thank you very much in advance

  24. rathish says:

    hi Toni,
    i am not able to down load the file, can you send me the file Via email ?
    Thankyou very much

  25. bog says:

    it works great. thanks

  26. Raj says:

    Can we again bridge the two channels left and right for subwoofer application, Please suggest.
    If so please help me to understand how to bridge the two channels to a single output with total 300+ watts.

  27. Raj says:

    I am not able to download the PDF files for
    Silk Screen, PCB, PCB component side, Silk screen, TDA7294 Eagle Library, TDA7294 Datasheet.

    Would you mind to send me the file Via email ?
    Thankyou very much

  28. adil says:

    good luck .
    any one try this if try then show me ur pic

  29. KC.Yung says:

    Hello,
    I’m very interesting in this project,but I cannot download the PDF file in my area(HongKong).Would you mind to send me the file Via email ?
    Thankyou very much !

    KC.Yung

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