Home Circuits Amplifier Circuit dynamic power amplifier with TDA7294 – bridge 180W or stereo 80W

Circuit dynamic power amplifier with TDA7294 – bridge 180W or stereo 80W

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dynamic power amplifier TDA7294 3D Board
Dynamic power amplifier TDA7294 3D Board

The TDA 7294 can be used in stereo mode (2 x 80Watts) or mono bridge mode (1x 180 Watts), to do this configuration simply set up 4 jumpers. To facilitate assembly the circuit has a power supply included. The power supply is simple symmetrical type with a bridge rectifier, capacitors being two large electrolytic, from 4.700μF to 12.000μF/50v. The recommended transformer is 12-0-12 at 25-0-25 / 5A, depending on the quality of the transformer recommended if a minimum of 6 Amperes current. Of course with a smaller transformer the power will be smaller as well as the current.

The TDA7294 is a monolithic integrated circuit in Multiwatt15 package, intended for use as audio class AB amplifier in Hi-Fi field applications (Home Stereo, self powered loudspeakers, Topclass TV). Thanks to the wide voltage range and to the high out current capability it is able to supply the highest power into both 4Ω and 8Ω loads even in presence of poor supply regulation, with high Supply Voltage Rejection. The built in muting function with turn on delay simplifies the remote operation avoiding switching on-off noises.

Another application suggestion is the BRIDGE configuration, where two TDA7294 are used,  In this application, the value of the load must not be lower than 8 Ohm for dissipation and current
capability reasons. A suitable field of application includes HI-FI/TV subwoofers realizations.

In stereo, all jumpers must be open and the speakers are plugged into connectors Lout and Rout and audio input connectors in the Lin and Rin. In the amplifier in bridge mode all jumpers should be closed and the audio output Lout is (+ the speaker) Rout (- the speaker) and audio input will be Lin, Rin will be shorted to ground via JB2.

The main advantages offered by this solution are:
– High power performances with limited supply voltage level.
– Considerably high output power even with high load values (i.e. 16 Ohm).
With Rl= 8 Ohm, Vs = ±25V the maximum output power obtainable is 150 W, while with Rl=16Ohm, Vs = ±35V the maximum Pout is 170 W.

In bridge mode the manufacturer does not recommend using with speakers with impedance less than 8 Ohms.

In this circuit the mute / stand-by switch has been removed, but if you prefer, you can add it, the assembly is simple with a suggested circuit board.

The integrated circuit body should be insulated from the heatsink using mica or plastic thermal pad to insulate the screw.

thermal pad mica tda7294 700x253 Circuit dynamic power amplifier with TDA7294   bridge 180W or stereo 80W tda7294 pcb tda power amplifier circuit power amplifier Download Audio amplifier tda Amplifier
thermal pad

Circuit of dynamic amplifier using tda 7294 – 180Watts bridge or stereo 2 x 80Watts – Click to enlarge

tda7294 esquema amplificador ponte estereo 558x500 Circuit dynamic power amplifier with TDA7294   bridge 180W or stereo 80W tda7294 pcb tda power amplifier circuit power amplifier Download Audio amplifier tda AmplifierIn bridge mode short circuit the jumper JB1, JB2, JB3, JB4.

Suggested printed circuit board (PCB) for circuit dynamic audio amplifier with tda7294

tda7294 pcb eagle power amplifier bridge stereo 700x504 Circuit dynamic power amplifier with TDA7294   bridge 180W or stereo 80W tda7294 pcb tda power amplifier circuit power amplifier Download Audio amplifier tda Amplifier
TDA7294 Bridge or stereo dynamic PCB board
tda7294 comp amplificador ponte estereo 700x518 Circuit dynamic power amplifier with TDA7294   bridge 180W or stereo 80W tda7294 pcb tda power amplifier circuit power amplifier Download Audio amplifier tda Amplifier
TDA7294 Bridge or stereo dynamic PCB layout
TDA7294 Bridge or stereo dynamic PCB silk
TDA7294 Bridge or stereo dynamic PCB silk

Component list

Parts Valor
Resistors 1/4 Watt 5%
R1,R3,R7,R9,R13 22k – Red, Red, Orange, Gold
R2,R8 680 – Blue, Gray, Brown, Gold
R4,R10 100k – Brown, Black, Yellow, Gold
R5,R11 27k – Red, Violet, Orange, Gold
R6,R12 47k – Yellow, Violet, Orange, Gold
R14, R15 4.7K – Yellow, Violet, Red, Gold
Capacitors
C1,C3, C10, C11, C16, C17 100nF (104) / 100V – Ceramic Capacitor
C2,C4 4.700µF a 12.000µF/50v – Electrolytic capacitor
C5,C7,C8,C9,C13,C14,C15,C18 22µF/50v – Electrolytic capacitor
C6,C12 1µF /100V or 250V – Polyester Capacitor
C19, C20 220pF /100V – Ceramic Capacitor
Semiconductors
CI1,CI2 TDA7294 – Integrated circuit
D1,D2 1N4148 Semiconductor diode
B1 GBU15G Or equivalent – Bridge rectifier
Led1, Led2 Red Led 5MM
Connectors
Power Terminal block connector 2 screws – Power supply connector
LOUT Terminal block connector 2 screws – Left Audio Output (Stereo mode) or (+) bridge mode
LIN Terminal block connector 2 screws – Right Audio Input (Stereo mode) or input (bridge mode)
ROUT Terminal block connector 2 screws – Right Audio Output (Stereo mode) or (-) bridge mode
RIN Terminal block connector 2 screws – Right Audio Input (Stereo) or not used (Bridge)
Miscellaneous
Transformer 12-12V at 25-25V
J1,J2,J3,J4,J5 Piece of wire – watch for the high current that will pass through them
JB1,JB2,JB3,JB4 Jumper to switch between amplifier modes
Printed Circuit Board, Welding, Wires, Box, heatsink,  etc.

Download PDF files to amplifier – PDF, PNG and Datasheet of TDA7294

Download PDF

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

15 COMMENTS

  1. i make this circuit pcb but its not working anyone tell me please is this a working circuit or something wrong in this circuit. please reply me

  2. is headphone/pc/mobile output is directly connected to tda 7249 input,
    power supply for 9 ic = 80Wx5 & 170Wx2
    ac to dc converting circuit.

    heat sink size

    i m looking for stereo to 5.1 channel converter,other than NJW1186,or by simply resistor & capacitors,
    and how to make remote control circuit for
    cent, sub, rear, L&R volume control

  3. dear sir using 2 ic is expensive for productin and sale in indian markets i am in this bussiness from last 25 years it will be better if you can make a stand by circuit for standby and mute pin activated with tectile switch THANK YOU

  4. are you sure that the pcb is right designet?at the shematik pins 5-11-12 are not conected..but at the pcb you have them conected…wtach going on??will i have any problem?
    (english is not my native language)
    PLEASE REPLY SOON…

    • i just noticed as well that the pins # 5,11,12 have no connection, i hope the author can discuss more details about the mute and standby section.

      has anyone tested the circuit already? please inform us, i will be happy to read more suggestion 🙂

      thanks author

  5. In the circuit diagram, there is 2200uF capacitor is used, in PCB you’re using 10000uF I can’t understand. What should be used? I purchased this IC, I went for MONO Amp using this IC, here i can get stereo, so please teach me.

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