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

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

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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 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

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

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

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

1. 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

Sethu Ramachandran.

2. hi toni,
i made this… super amazing amp…
nice clearity & bass !
100000…thanks toni..
I like u so much.
Thanks,keep it up man.

3. 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.

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

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.

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.

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

Silk Screen, PCB, PCB component side, Silk screen, TDA7294 Eagle Library, TDA7294 Datasheet.

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

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

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. 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

15. 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.