Simple & Super HiFi Stereo Bass Amplifier Using TDA7297

 

Simple & Super HiFi Stereo Bass Amplifier Using TDA7297

As a result, one such topic that piqued my interest is the circuit design and assembly of a homemade, compact yet powerful stereo amplifier using a TDA7297 dual-channel amplifier IC. It uses a few bits like resistors, capacitors, a potentiometer, and a 12V (computer PSU) source and can drive two 50-watt speakers, maybe for personal audio or desktop audio. This guide gives you a step-by-step on how to build it.

Components You’ll Need:

• TDA7297 IC or a pre-built TDA7297 module

• 47k ohm resistor

• Capacitors: 10µF/25V x 2 and 47µF/25V

• 100k ohm potentiometer (for volume control)

• 50W x 2 speakers (preferably 8 ohm impedance)

• 12V 1- 3A DC power supply

• Wires, soldering tools, perfboard or PCB

• Optional: heat sink (if using the bare IC), input jack, speaker terminals

TDA7297 Amplifier – Main Features:

1. Class AB Dual-Channel Amplifier – Best suited for stereo audio applications.

2. Stereo Output Power: 30W + 30W (with 8 Ohm speakers and 12V supply).

3. Wide Operating Voltage Range: 6V to 18V.

4. High Peak Output Current: Max. 1-3A.

5. Integrated Control Functions: Stand-by and Mute operations for easy use.

6. Low Power Consumption: Up to 65mA maximum quiescent current.

7. Fixed Voltage Gain: 33dB close-loop gain maintains stable audio performance.

Circuit Design and Connection:

1. Power Supply Connection:

First connect the +12V from the power supply to the pin 3-13 of TDA7297 (which is the Vcc input). Connect the GND of the power supply to pins 8-9. A 1000µF capacitor between Vcc and GND to stabilise the power and filter out high-frequency noise.

2. Speaker Outputs:

One end of the left speaker is connected between pins 1 and 2, while the other end of the left speaker is connected between pins 14 and 15. Ensure both channels are correctly polarised so we do not have any phase problems. At 12V with a reasonable heatsink, the TDA7297 will output around 30-50W per channel of decent audio quality. 

3. Audio Input with Volume Control:

The volume control is a 100k 6-pin pot. The left and right audio signals go to the middle pin of the pot.

10uF capacitors join pins 4-5 and 11-12 of the IC, which correspond to the left or right input pins.

To not allow any potential DC to destroy the IC, place a 10µF capacitor between each of these inputs.

***Circuit Diagram***

Assembly Tips:

• If you are using a bare IC TDA7297, place it on a heatsink because it will heat up when loaded. If it's in a module, it usually comes with a mini heatsink and screw terminals for easier connection.
• Use high-quality connectors and wires to reduce noise and ensure long-term performance.
• You can mount all this on a perfboard or wood/plastic enclosure for protection and portability.
• Ensure all capacitors are wired with the right polarity, especially electrolytics.

Testing the Amplifier:

Once you have everything hooked up, plug in the 12V 3A power supply, connect your speakers, and supply it with an audio signal (such as from a phone or computer). Turn the potentiometer up slowly to turn up the volume. You should be able to hear good stereo sound with nice bass and volume—enough to fill a small room!

Conclusion:

This simple amplifier project using the TDA7297 IC is a great way to learn audio electronics. It’s compact, affordable, and delivers surprisingly good audio. With just a handful of components, you can power up 50W speakers and enjoy rich, stereo sound from your DIY creation.