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Brutus – Circuit Audio power Amplifier stereo with tda7294 bridge 2x 170 W

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TDA7294 Bridge stereo 3D Board
TDA7294 Bridge stereo 3D Board

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.

The TDA7294 integrated circuit developed by SGS Thompson (www.st.com), allows you with little money, have a complete amplifier, it is designed as an AB class audio amplifier and is ideal for use in home systems Theater and high quality amplifiers for easy assembly. It is capable of working with 4, 8 and 16 Ohms loads (speakers). It is capable of delivering 100 Watts @ 4 Ohms, VS = + – 29V, 100 Watts @ 8 Ohms, Vs = + – 38V. The total distortion is only 0.1% at PO = 0.1 to 50 Watts and F = 20Hz at 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 =+-25VDC, PO = 150 Watts
R = 16 Ohms Vs = +-35VDC, Po = 170 watts

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

tda7294 bridge esquema amplificador 700x781 Brutus   Circuit Audio power Amplifier stereo with tda7294 bridge 2x 170 W tda7294 pcb tda stereo schematic power amplifier Circuits Audio amplifier tda Amplifier
TDA7294 Bridge stereo schematic

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

Power supply for Brutus – The power supply is composed of a 18-0-18 to 26-0-26 @ 350VA transformer, The bridge rectifier must be a GSIB2580 or equivalent, the capacitors can be from 4.700μF/50V Up to 10.000μF/50V. There are also 2 ceramic capacitors and 2 resistors, the function of these resistors is to discharge the large electrolytic capacitors, when you turn off the circuit.

Power amplifier – The amplifier part is configured to work in stereo bridged stereo, using 4 integrated circuits, resistors R11, R12, R17, R18 (R) and R13, R14, R20, R21 (L) determine the gain of the amplifier. With these components is set to 30 dB. The mute/Stand-by circuit is connected directly to the VCC of the circuit. The input impedance is determined by the resistors R4 and R9.

When assembling the integrated circuits in the heatsink, you must use insulated bushings to avoid electrical contact between the metal body of the IC and the heatsink.

thermal pad mica tda7294 700x253 Brutus   Circuit Audio power Amplifier stereo with tda7294 bridge 2x 170 W tda7294 pcb tda stereo schematic power amplifier Circuits Audio amplifier tda Amplifier
thermal pad

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

tda7294 ponte pci amplificador 700x329 Brutus   Circuit Audio power Amplifier stereo with tda7294 bridge 2x 170 W tda7294 pcb tda stereo schematic power amplifier Circuits Audio amplifier tda Amplifier
TDA7294 Bridge stereo PCB bottom
tda7294 bridge layout amplificador 700x332 Brutus   Circuit Audio power Amplifier stereo with tda7294 bridge 2x 170 W tda7294 pcb tda stereo schematic power amplifier Circuits Audio amplifier tda Amplifier
TDA7294 Bridge stereo PCB layout
TDA7294 Bridge stereo PCB Silk top
TDA7294 Bridge stereo PCB Silk top

About Brutus circuit assembly
The printed circuit board suggested for this assembly is single face, to facilitate mainly the life of the beginners … however if it is simple face there comes Jumpers! Connect pieces of wire, interconnecting the dots, paying attention to the thickness of the jumpers at the power connection points.

 List of material to mount the amplifier in bridged Brutus

Parts Value
Resistors
R1, R2 27k
R3, R8 100k
R4, R9, R11, R13, R15, R16, R17,R19, R20, R22 22K
R5, R6, R7, R10 47k
R12, R14, R18, R21 47k
Capacitors
C1, C2, C17, C18 1µF /250V – Polyester Capacitor
C3, C6, C7, C8, C13, C14, C21, C22 22µF/50V – Electrolytic capacitor
C4, C5, C9, C10 10.000µF/50V – Electrolytic capacitor
C11, C12, C15 C16 100nF /100V – Ceramic Capacitor
C19, C20 220µF /50V – Electrolytic capacitor
Semiconductors
B1 Bridge rectifier VSIb2580, GSIB2580, D25xb60, GBJ2510, or equivalent
D1, D2 1N4148
IC1, IC2, IC3, IC4 TDA7294
Connectors
L-IN Terminal block connector 2 screws – Left Input
L-OUT Terminal block connector 2 screws – Left Output
R-IN Terminal block connector 2 screws – Right input
R-OUT Terminal block connector 2 screws – Right output
AC Terminal block connector 2 screws – Transformer
Miscellaneous
Transformer 18-0-18 at 26-0-26 VAC /8A
Printed Circuit Board, Welding, Wires, Box, heatsink, etc.

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

Download PDF

Buy Diy kits TDA7294 in Aliexpress with free Shipping in the Worldwide.

43 COMMENTS

  1. Hi Toni,
    I builted brutus amplifier and it doesn’t work correct.
    Once, I start the amplifier without load, it start increasing the temperature to the ics and bridge rectifier rapidly.
    Please, I would like some to find the problem

    Nick

  2. Hi Mr Toni ,

    Greetings to you and your family,

    very interesting one ,

    can u send me the Pdf files for the Pcbs , where iam not able to down load

    Thanks in advance,
    Sethu Ramachandran.

  3. hi toni,
    i made this… super amazing amp…
    nice clearity & bass !
    100000…thanks toni..
    I like u so much.
    Thanks,keep it up man.
    (&i also made your another some circuits, all are success &great)
    plz give your email id.

  4. 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.

    • Hi jeo. I like to make this amp. but I can’t understand this resistors, resistance R1,R2 it’s 47K or 4.7K
      and this one R14 to R28 it’s 47K or 4.7K ??? please help me.

  5. 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.

  6. 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.

  7. 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

  8. 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

  9. 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.

  10. 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. 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

  12. 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

  13. 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.

  14. 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.

  15. 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

  16. 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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