Circuit dynamic power amplifier circuit with IC Dmos TDA7294 – bridge 180W or stereo 2 x 80 Watts

This circuit described here uses two cis tda 7294 for use in stereo (2 x 80Watts) or bridge mode (1x 180 Watts), to configure this setting just four jumpers. To facilitate mounting the circuit has power supply attached. The power is kind of simple symmetrical with a bridge rectifier 6A, and two large electrolytic capacitors , 10000μF the 22000μF/50v. This Power supply will for the two modules. The processor is recommended 22-0-22 to 28-0-28 / 5A, depending on the quality of the transformer is recommended at least 6 amps of 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, Top-
class 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 (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.

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

tda7294 esquema amplificador ponte estereo 450x403 Circuit dynamic power amplifier circuit with IC Dmos TDA7294   bridge 180W or stereo 2 x 80 WattsIn bridge mode short circuit the jumper JB1, JB2, JB3, JB4.

Suggested printed circuit board (PCB) for mounting circuit dynamic audio amplifier with tda7294 – Scale 1:1

tda7294 pcb eagle power amplifier bridge stereo Circuit dynamic power amplifier circuit with IC Dmos TDA7294   bridge 180W or stereo 2 x 80 Watts

Component side to guide the assembly of the amplifier circuit – Click to enlarge

tda7294 comp amplificador ponte estereo 450x278 Circuit dynamic power amplifier circuit with IC Dmos TDA7294   bridge 180W or stereo 2 x 80 Watts

Component list

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
C1,C3 0.22µF – 100 volts – Polyester film capacitor
C2,C4 10000µF/50v – Electrolytic Capacitors
C5,C7,C8,C9,C13,C14,C15,C18 22µF/35v – Electrolytic Capacitor s
C6,C12 0.560µF – 100 volts – Polyester film capacitor
C10,C11,C16,C17 100nF – 100 volts – Polyester film capacitor
CI1,CI2 TDA7294 – Integrate Circuit  from ST Microelectronics
D1,D2 1n4148 – Diode
B1 Rectifier Bridge  6A/200 Volts
CN1 Connector to trafo  22-0-22 a 28-0-28
CN2 Output Connector left channel (stereo mode) or (+) bridge mode
CN3 Input Connector Left Channel (stereo mode) or Bridge input
CN4 Input Connector Right Channel (stereo mode)
CN5 Output Connector left channel (stereo mode) or (-) bridge mode
J1,J2,J3,J4,J5 Wires – note the current driven it will go through them
JB1,JB2,JB3,JB4 Jumper to switch between the amplifier modes
Transformer 22-0-22 a 28-0-28 / 5 amperes, wires, box, etc.

Download pdf files for amplifier – pcb, silk and tda7294

Users electronic tags:

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Filed Under: AmplifierAudioCircuits


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

RSSComments (9)

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  1. youraj says:

    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

  2. florian says:

    Hello, can you please upload the pcb in an better quality? :)

  3. amardeep singh says:

    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. dhanraj says:

    bridge mode power supply

  5. panos says:

    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)

    • mark says:

      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

  6. carlos cruz says:

    sera ke pueden cambiarr el servidor de descargaaa ke no funcionaa.. porfavorr.. otra cosa hasta cuandos watts es lo maximo que se puede usar el parlante por cada canal

  7. Pasupathi says:

    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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