Audio amplifier is very important in electronics systems, it make sound signal strong to drive a speaker.
IC TDA2613 is Hi-Fi audio amplifier chip which give good sound and need few extra parts.
This article for Efficient 6 Watt Audio Amplifier Circuit with IC TDA2613 show how to make simple 6 watt amplifier using TDA2613 and also, the circuit is good for small audio system with low distortion, wide frequency and easy to build.
Circuit Working:
Parts List:
| Components | Values | Quantity |
|---|---|---|
| Resistors | 1/4 watt 8.2Ω | 1 |
| Capacitors | Ceramic 22nF, 100nF | 1 each |
| Electrolytic 100μF 25V, 220μF 25V | 1 each | |
| Electrolytic 680μF 25V | 2 | |
| Semiconductors | IC TDA2613 | 1 |
| 8Ω Speaker | 1 |
The 6 W amplifier circuit uses the TDA2613 chip as its main component, adding a few passive parts for coupling, decoupling and feedback.
After that, audio signal goes in pin 9 through capacitor C4 and this capacitor block DC and let only AC audio pass; then IC Chip boost signal and gives output at pin 6.
We use the feedback components R1 and C1 for stable gain and better sound, before the 8 Ω speaker, the signal passes through capacitor C2, which blocks DC and sends only AC to the speaker.
Furthermore, C5 and C6 filters power, reduces noise and ripple by keeping chip work stable and TDA2613 IC works on 12V to 24V DC and its best is near 18V like in our circuit.
Also, power supply must be clean and stable, as bad supply can make noise and reduce sound quality.
Formulas with Calculations:
Formula for 6W audio amplifier with TDA2613:
Output Power:
P = (V²) / (2 × R_load)
If supply voltage (Vs) is 18V and speaker is 8Ω:
Peak voltage = 18 × 0.7 = 12.6V which is about 70% of Vs
RMS = 12.6 / √2 = 8.91V
P = (8.91²) / (2 × 8) = 4.96W = 5W
In ideal case the chip can give up to 6W.
Coupling Capacitor C2:
C2 helps pass low sound like bass without loss.
Cutoff freq (f_c) = 1 / (2π × R × C)
Set f_c = 20Hz for good bass:
C2 = 1 / (2π × 8 × 20) = 995µF
But we use 680 µF here and it still works fine because it sets the cutoff slightly above 20 Hz.
How to Build:
To build a Efficient 6 Watt Audio Amplifier Circuit with IC TDA2613 follow the below steps for connections:
- First, take all parts as shown in circuit diagram.
- Next, connect pin 3 of TDA2613 to GND using capacitor C3 and also connect pin 3 to pin 8.
- Now connect pin 5 to GND.
- After that, connect pin 6 to one side of 8Ω speaker through capacitor C2 and other side of speaker to GND.
- Further, from pin 6 and also connect capacitor C1 and resistor R1 to GND.
- Then pin 7 goes to +18V DC and from power line connect capacitor C5 and C8 to GND.
- Finally, pin 9 connect to audio input using capacitor C4 and other side of audio input goes to GND.
Conclusion:
To conclude, this Efficient 6 Watt Audio Amplifier Circuit with IC TDA2613 is simple and good for small audio work, it uses less parts, easy to build and sound quality is very good.
Hence, if we choose parts right and follow the circuit diagram we can make strong and clear amplifier for better sound.