TDA7293 amplifier circuit diagram with PCB

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TDA7293 amplifier circuit diagram with PCB 2x 100W. Amplifier circuit stereo audio with good power, using integrated circuit TDA7293 for up to 2x 100 Watts. With Suggested PCB mounting design. Includes power supply to the circuit itself, thus only requires a transformer to power. PCB compact size, even being single sided. Allowing mount a power amplifier and compact with good quality, ideal for various applications.

Includes power supply on board, only requires a transformer to power the circuit.
The part of the power supply uses bridge rectifier, large electrolytic capacitors to filter values ​​can be used since the 4.700μF to  12.000μF. The LEDs, in series with the resistor and indicate on state, serve to discharge the electrolytic capacitors.
Includes circuit mute / stand-by, but was not placed key to turn on and off, is to avoid clicks in the speakers on and off, being unnecessary to use the relay output.
The power transformer can be from 18-0-18 to 33-0-33 / 200VA, with transformer with lower voltage may need less current too.

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 Mica Tda7294 700×253 Circuit Dynamic Power Amplifier With Tda7294 Bridge 180W Or Stereo 80W Tda7294 Pcb Tda Power Amplifier Circuit Power Amplifier Download Audio Amplifier Tda Amplifier

About the TDA7293 amplifier circuit diagram with PCB

This is another application for this versatile integrated circuit that allows simple bridge and parallel mounting. This time we present the stereo version. This circuit also has good sound quality and protection against overheating and short circuits.
It includes a power supply on the board, requiring only a transformer to power the circuit.
The source part uses a rectifier bridge, large electrolytic capacitors for filter, values from 4,700µF to 10,000µF can be used. The leds in series with the resistors not only indicate the on state, but also discharge the electrolytic capacitors.
The mute/stand-by circuit is included, although no key was placed to activate and deactivate it, but it serves to avoid clicks in the speakers when turning them on and off, making it unnecessary to use a relay in the output.
The board design has close tracks, so be careful when “fabricating” your PCB, to check for possible shorts.
The transformer can be from 12-0-12 to 28-0-28, with a lower voltage transformer you may need less current too! For transformer related calculations, see this article. To see a graph of power vs voltage ratio, check the PDF datasheet of the IC.

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Capacitor C2 and C23 form the AC coupling for our amplifier and with R1 and R10 form a high-pass filter circuit, influencing mainly the low frequencies (bass). Using a 470nF capacitor according to the datasheet we have a cut-off at about 15Hz, and if a 1uF capacitor (our case) is used we have a cut-off at about 7Hz. For a 2.2uF capacitor, we have 3.2Hz.

The formula is f = 1/(2ΠRC)

The resistor R15 /C21 and R4 /C22, form a low-pass filter to keep high-frequency signals away from our power amplifier. For the values used, we have a cutoff at about 400 KHz. If you prefer, change the components with larger values and lower the cutoff frequency.

The formula is f = 1/(2ΠRC)

The mute circuit was implemented according to the circuit available in the datasheet, and capacitors C5 and C6 together with R5 and R7 are responsible for the time constant when switching the amplifier on and off and avoiding “pop”.
Resistors R11-R13 and R2-R3 are responsible for the gain and in the circuit configuration they are set to 30 dB, you can change these components to alter the gain. However, make sure that R11-R2 is the same value as R13-R3.
The resistors R1-R10 are the ones that determine the input impedance of the amplifier.

The circuit formed by R6-C4 and R12-C16 is a Boucherot cell, also known as a Zobel net. A Zobel net helps prevent oscillation that can occur in parasitic induction of the long speaker wires. It also acts as a filter to prevent radio interference coming through the speaker wires from reaching the inverter input of the amplifier through the feedback loop.

Capacitors C7 and C19 are for DC decoupling of the feedback circuit, if you prefer to use larger values to improve bass response. Capacitors C3 and C17 are for bootstrapping and have different position for TDA7293 compared to TDA7294, TDA7295 and TDA7296. On the PCB, it is indicated as 93/94.

Table of CIS that can be used in our TDA7293 Amplifier and equivalent.

CI TDA7293 TDA7294 TDA7295 TDA7296
Maximum power 100W 80W 60W 50W
Maximum voltage at 4 Ohms* 33VDC 30V DC 26VDC 22VDC
Maximum voltage at 8 Ohms* 40VDC 38VDC 35VDC 30VDC

*Dual power supply, stereo mount.

Schematic TDA7293 amplifier circuit diagram with PCB

Tda7293 Amplifier Circuit Diagram With Pcb Schematic
Tda7293 Amplifier Circuit Diagram With Pcb Schematic

Suggested PCB layout

 

Printed Circuit Board Tda7293 Amplifier Circuit Diagram With Pcb
Printed Circuit Board Tda7293 Amplifier Circuit Diagram With Pcb
Printed Circuit Board Component View Tda7293 Amplifier Circuit Diagram With Pcb
Printed Circuit Board Component View Tda7293 Amplifier Circuit Diagram With Pcb
Printed Circuit Board Component Silk Tda7293 Amplifier Circuit Diagram With Pcb
Printed Circuit Board Component Silk Tda7293 Amplifier Circuit Diagram With Pcb

BOM for mounting tda7293 stereo

Last Update: 09/11/2021 18:24

Part Value Description Quantity
Capacitors
C1, C4, C8, C13, C16, C20 100nF/100V Ceramic Capacitor 6
C2, C23 1µF/63V Polyester Capacitor 2
C3, C5, C6, C17 22µF/63V Electrolytic capacitor 4
C7, C19 47µF/63V Electrolytic capacitor 2
C9, C11 10.000µF/63V Electrolytic capacitor 2
C21, C22 220p/100V Ceramic Capacitor 2
Semiconductors
D1 1N4148 Diode 1
IC1 TDA7293, TDA7294 or TDa7295, or TDA7296 Audio amplifier integrated circuit 2
B1 GBJ3510, GBJ2510 or equivalent Bridge rectifier 1
LED1, LED2 Led 5MM Red LED or color of your choice 2
Resistors 1/4W
R1, R2, R7R10, R11 22K Red, red, orange, gold 4
R3, R13 680 Blue, gray, brown, gold 2
R4 33k Orange, orange, orange, gold 1
R5 10k Brown, black, orange, gold 1
R6, R12 2,7 ohm 1 Watt Red, violet, gold, gold 2
R8, R9 4,7K Yellow, violet, red, gold 2
R14, R15 1,8K Brown, black, red, gold 2
Miscellaneous
CN1 LIN Jst Xh 2-Way Connector 2.54 mm pitch or equivalent 1
CN2 RIN Jst Xh 2-Way Connector 2.54 mm pitch or equivalent 1
CN3 AC Terminal block 3 pin 5.08 mm 1
CN4 OUTL Terminal block 2 pin 5.08 mm 1
CN5 OUTR Terminal block 2 pin 5.08 mm 1
Solder, Wires, PCB, housing, connectors, insulation for the CIS, heatsink, etc.

Download PDF files of this assembly: TDA7293 datasheet, copper side plate, component side.

Gerber added

Download PDF

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58 thoughts on “TDA7293 amplifier circuit diagram with PCB”

  1. hi toni, some parts are missing and some are wrong values.r5,r15 on part list is 100k on sematis is 10k.c 21,c22 is not on part list 220pf.r4,r14 on part list 27k on shematic is 33k.R7, R16 on part list 33k on sematic is 22k.

    Reply
  2. Good morning, I wanted to know kindly the input power of the amplifier how many volts? Thanks, I am waiting for an answer

    Reply
  3. Hello,
    I had some questions about this circuit:
    1. Which speakers can I use on the output,A tweeter or an woofer?
    2. Is the output of these anolog or digital?
    3.If you could send me the pcb Files from EAGLE.

    Reply
  4. I assembled this circuit but when I give power it works few seconds and no sound. Can you help me out. Power transformer is 24-24 1-1 ampier

    Reply
  5. РУССКИЙ
    каковы размерыкаковы размеры печатной платы29 / 10000
    АНГЛИЙСКИЙ
    Перевести вGoogleBing
    what are the dimensions of the PCB

    Reply
  6. Hi. I have question about the transformer. I have one where i have 24V AC but i don’t have a GND. Where can i get GND? Can i make it by myself or i must buy transformer with it?. Thanks.

    Reply
  7. Hello, the circuit is great! but I have doubts about the transformer, i can buy 18,0,18 V or 24,0,24 V transformers, but the only thing i know is the max output current. Is it ok if i calcuate 200VA/36V=5,5A(for the 18V one) and 200VA/48V=4,1A (for the 24V one)?

    Reply
    • Hello Nima. I saw recently some ciruits and it seems, that tda7294 is usable, but you might Add or take one capacitor of ciruit. Cant remember, fell free to search the web.

      Reply
  8. ME PARECE BIEN
    cual es el propósito con los circuitos de audio hay otros que interesen o que sean mas industrial
    esa es una forma de informarse bien espero que sigan asi proporcionando ideas pronto nos comunicamos
    que estén bien Sres

    Reply
  9. where can i buy the whole PCB and component of this audio amp. i myself will assemble it. please help me i am very much interested in this stuff..thank you very much

    Reply
  10. I have no any idea or experiance about this all.but i want to learn to build it self.truly i,m most lover of this simple circuit amp controller and most for high watt capasity.so guy, i cant build it and wont make any deal with china.you all know it why,.well if somebody agree and want sell own project (finish good) to me should reply me on [email protected].
    No metter what of value been set by you.

    Deal guys.good conditions for good price.

    BOOOM LOVER

    Reply

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