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100Watt Audio Amplifier using TDA7294

Feel the extraordinary bass of this amplifier, Hi-fi and realistic audio using TDA7294 Mono.

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Hello guys, today in this tutorial we will know, how to make a high bass amplifier circuit using Tda7294 Ic. This is 100watt Hi-Fi sound Ic. So, a very high power can be drawn using this amplifier circuit. This amplifier works on dual power supply that’s why we need a center tapped 12-0-12volts 5 Ampere transformer to get better sound quality. Today here, we will design only one channel (mono-channel) and using the same circuit it can be turned in stereo.
This is a class AB amplifier, so we need a good heat dissipator and a stable input power supply (High quality DC – using filter circuit).

Hello guys, today in this tutorial we will know, how to make a high bass amplifier circuit using Tda7294 Ic. This is 100watt Hi-Fi sound Ic. So, a very high power can be drawn using this amplifier circuit. This amplifier works on dual power supply that’s why we need a center tapped 12-0-12volts 5 Ampere transformer to get better sound quality. Today here, we will design only one channel (mono-channel) and using the same circuit it can be turned in stereo.

This is a class AB amplifier, so we need a good heat dissipator and a stable input power supply (High quality DC – using filter circuit).

Features:

1) High input voltage range (+-40v)

2) Muting/ standby function’

3) No switch on/off noise

4) Short circuit protection

5) Thermal shutdown

6) Low noise

In last we will make a fully working PCB and order it from our sponsor JLCPCB. JLCPCB is China’s Top PCB manufacturing company (just $2 for 5 Pcb).

Tda7294 pinout:

ice_screenshot_20211118-181154.png

Components used:

1 TDA7294 ic x 1

2) 1K resistor x1

3) 22k resistor x 3

4) 10k resistor x1

5) 47uF 50-volt capacitor x 2

6) 100uf 50volt capacitor x1

Circuit is same as given in the datasheet, after changing component placement the simplifier circuit diagram is shown below.

Circuit diagram:

circuit as in datasheet:

ice_screenshot_20211118-140117.png

redrawn by us:

Schematic_7294 mono_2021-11-15.png

Circuit is fully completed and we need a good big heat sink with fan with this amplifier, also if using the circuit in stereo or bridge mode, add a layer of insulated mica sheet behind these IC’s. So that we can prevent Aluminium heat sink to short circuit.

Also, in bridge mode use 8ohm speaker for best output and use 24-0-24 power supply.

Also, the original version of this IC have, thermal, short circuit and overheat protection features.

Gerber files:

Download all the important material, circuit diagrams, schematics, PCB Gerber FROM HERE.

Untitled.png

Future updates:

For now, we are just working on a single 100w channel but in future we will also write about dual channel, stereo and mono channel. We will make a separate PCB for that and order it from JLCPCB.

Please follow us on Instagram to stay updated with new projects (id:Sagar_saini_7294).

VIDEO:

This is the short video about, how our 100W TDA7294 Mono amplifier is working.

You can feel the bass and audio quality of this mono channel amplifier through this video.

About JLCPCB:

JLCPCB is the one of the most popular PCB makers. Price is just $2 for 2, 4 and 6 layer PCB. They just launched new purple solder mask, aluminum Pcb and 3d printing service in very low cost. Pcb quality is not compromised at any cost. Check them out right now from Here.https://jlcpcb.com/IAT

ice_screenshot_20211111-214029.png

JLCPCB also provide SMT assembly and SMT stencil service, don’t forget to try these services. Try PCB Assembly just in $7.

More from us:

1) How to make Arduino Uno clone board. 2) Breadboard constant voltage power supply module.


Think you enjoy my work, stay tuned. Follow us on Instagram (sagar_saini_7294) and hackaday.

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  • 1 × TDA7294 Audio ICs / Audio Amplifiers
  • 3 × 22k resistor
  • 2 × 10k resistor
  • 1 × 1k resistor
  • 2 × 47uf capacitor

View all 10 components

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FORART fe wrote 11/27/2021 at 12:07 point

Hi there, even if not clearly specified, seems that this nice project is open source licensed (if not, please evaluate to).

We suggest to check out those resources that may inspire future evolutions:

- https://hackaday.io/list/164049-odfas-amplifiers

- https://github.com/forart/ODFAS/blob/main/ClassB.md

Thanks for your precious work !

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