TDA7293 Amplifier TDA7294 Amplifier Circuit #Minimus

Table of Contents

TDA7293 amplifier TDA7294 amplifier circuit diagram #Minimus. Audio power amplifier project based in integrate circuit tda7294 IC circuit diagram or TDA7293 amplifier. Compact printed circuit board and is ideal to be used where a compact amplifier and with adequate power to be used in various applications, such as computer amplifier necessary, games, MP3 Player, Home Theater, Sound environment, amplified Cash, etc.

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 4 Ω and 8 Ω 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.

All features

Thermal shutdown
short circuit protection
very low distortion
no boucherot cells
very high operating voltage range (±40v)
high output power (up to 100w music power)
dmos power stage
no switch on/off noise
very low noise
muting/stand-by functions

Features TDA7293 amplifier TDA7294 amplifier circuit diagram #Minimus.

Classic application using the IC TDA7293/TDA7294
To assemble with TDA7294 or TDA7293 just by changing the position of a capacitor.
Great audio quality
Easy assembly.
Uses just a few components in the assembly
Reduced size board 50 mm X 36 mm
Power -/+ 18-36 VDC (Symmetrical power supply)
Maximum power: 80 (7294) – 100 (7293) Watts RMS
Output Impedance: 4 at 16 Ohms.

Table of equivalent IC that can be used in our Amplifier.

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

*Symmetric power supply, stereo mount.

Also get to know these circuits:

Schematic TDA7293 amplifier, TDA7294 amplifier circuit diagram #Minimus.

Audio Power Amplifier With Ic Tda7294 Or Tda7293 – #Minimus - Schematic — Audio Power Amplifier With Ic Tda7294 Or Tda7293 – #Minimus – Schematic

Suggestion of printed circuit board for assembly of mini amplifier

Audio Power Amplifier With Ic Tda7294 Or Tda7293 – #Minimus - Pcb Bottom — Audio Power Amplifier With Ic Tda7294 Or Tda7293 – #Minimus – Pcb Bottom

Audio Power Amplifier With Ic Tda7294 Or Tda7293 – #Minimus - Pcb Top — Audio Power Amplifier With Ic Tda7294 Or Tda7293 – #Minimus – Pcb Top

Audio Power Amplifier With Ic Tda7294 Or Tda7293 – #Minimus - Pcb Layout — Audio Power Amplifier With Ic Tda7294 Or Tda7293 – #Minimus – Pcb Layout

The transformer is connected at the power supply should be able to provide power equivalent to 1.4X the amplifier power. This power is on the DC voltage used.

In the chart below we can see what will be the maximum power, by matching Po(W) and Vs(+/-).

Eg: for 25V => 60W and 30V => 83 Watts. This when connected to speakers of 4 Ohms. This THD to 0.5%.
Note that for 4 Ohms the maximum is +/- 30VDC for TDA7294.

Below is the chart to TDA7294 linked into 8 Ohms – The power supply can be up until +-36VDC.

To determine what will be its maximum DC voltage according to the transformer using the following formula: Vf = (1,4 x Vi) – 0,5
Where: Vf = final voltage
Vi = Voltage in the transformer

Ex: For a 24-0-24 transformer have:
Vf= (1,4X24) – 0,5 = 33V

Ex: Transformer for +/-28VDC
28=(1,4xVI) – 0,5 = 1,4Vi=28-0,5 = Vi =27,5/1,4 = 19,64C

With this value at hand just go on the chart and find what will power for this case!
For TDA7293, see the Datasheet
Notice the layout how to assemble the capacitor properly for TDA7294 or TDa7293.

BOM for assembling the Minimus Power Series amplifier with TDA7294/93

Part	Value
Resistors 1/4 W 5%
R1, R3, R4	22K — Red, Red, Orange, Gold
R2	680 — Blue, Gray, Brown, Gold
R5	10K — Brown, Black, Orange, Gold
R6	33K — Orange, Orange, Orange, Gold
R7	4.7 Ohms — Yellow, Violet, Gold, Gold
Capacitores
C1, C2, C3,	100nF — Ceramic or Polyester Capacitor.
C4, C7	22µF/50V — Electrolytic Capacitor
C5, C6	47µF/50V a 220µF/50V — Electrolytic Capacitor
C9	1µF — Polyester Capacitor
C10, C11	10µF/50V — Electrolytic Capacitor
Semiconductors
D1	1N4148 — Semiconductor Diode
IC1	TDA7293 or TDA7294 – Audio amplifier integrated circuit.
Connectors
IN	Audio Input Connector
PW	power supply connector
OUT	Audio Out Connector
Diversos
Solder, Wires, Pci, Box, 18 to 36 Volt DC /2.5 Amp symmetrical supply, etc.

Download the files for this assembly Datasheet, PDF printed circuit board, schematic, component layout.

Gerber added.

Download

Mirror

Buy TDA7293 Amplifier board in AliExpress

11 thoughts on “TDA7293 amplifier TDA7294 amplifier circuit #Minimus”

Luis Fernando luna

March 19, 2023 at 2:05 am

Compre una placa en ali exprés e alimentado hasta 18v ,1 AM pero solo se calienta con toda 94
biem pineado con capacitor tambiem alimente con 25 v,1am igual no me arranca pero si calienta el ic no sé dónde anda el error Garcías me ayudarán resolber antes empiese ser frustrado…… Gracias compas
- Toni
  
  November 19, 2023 at 9:47 am
  
  Hola Luis, La placa era para TDA7293 y le pusieron TDA7294, debes cambiar el capacitor que vi del pin 6 al 12 y cambiarlo del pin 6 al 14.
ali alizadeh

April 13, 2018 at 12:17 am

چه نوع خازنی C9 است؟ با سه پا؟
- Toni
  
  June 25, 2018 at 1:32 pm
  
  Hello
  See this
  https://xtronic.org/circuit/amplifier/audio-power-amplifier-with-ic-tda7294-or-tda7293-minimus/#comment-115338
tom0mason

February 1, 2018 at 12:46 pm

A quick note on C9.

C9 must be configure correctly for the IC you are using.
If a TDA7294 then C9 must be connected ONLY from pin 14 to pin 6 of the IC.

If you use a TDA7293 the C9 (the bootstrap capacitor) the chip manufacturer, ST or STMicroelectronics , says this —

“THE BOOTSTRAP CAPACITOR
For compatibility purpose with the previous devices of the family, the boostrap capacitor can be connected both between the bootstrap pin (6) and the output pin (14) or between the boostrap pin (6) and the bootstrap loader pin (12).
When the bootcap is connected between pin 6 and 14, the maximum supply voltage in presence of output signal is limited to 100V, due the bootstrap capacitor overvoltage.
When the bootcap is connected between pins 6 and 12 the maximum supply voltage extend to the full voltage that the technology can stand: 120V.
This is accomplished by the clamp introduced at the bootstrap loader pin (12): this pin follows the output voltage up to 100V and remains clamped at 100V for higher output voltages. This feature lets the output voltage swing up to a gate-source voltage from the positive supply (VS -3 to 6V).

So you have the option, EITHER pin 14, or pin 12, BUT NOT BOTH!
IMO, the drawing is correct in trying to show both options, however the write-up fails to indicate well that it is an option depending on which IC you are using.
I hope this helps.
- Toni
  
  June 25, 2018 at 1:31 pm
  
  Hello tom0mason
  Thanks for the remark, really 93 and 94 was discreet!
Raj Kumar

December 22, 2017 at 5:37 am

Hi I assembled this Mono amp but when I supply 12 volts 1 amp power I get a loud human only. Can you help me put this to work.
[email protected]
Wai Yan

October 2, 2017 at 3:04 am

What type of capacitor C9 is? with three legs?
- Raj
  
  November 23, 2017 at 5:57 am
  
  I bought this circuit board on E.Bay and assembled it but it doesn’t work. I am getting only a hum in the speakers. I am not sure about C9 capacitor so I coupled 2 capacitors. Can you help me to find te fault on it.
  Raj
alehandro matchupo

July 16, 2017 at 10:16 pm

Comment:
HI, John di!
if U have sprint layout TL074 as filter subwoofer please send to my email
[email protected]
John Doe

February 11, 2017 at 1:17 pm

Hi Toni!
We have a project of a stellar LM3886 High-end DC-servo amplifier complete with Sprint-Layout and schematic/pictures, check it out.
Download link: https://www.mediafire.com/?uw6vyst83qamamc
Happy constructing!

(Please post on your blog.)