This article for Amplifier Circuit using IC TDA2030 talks about how to make 12 watt amplifier by using an IC.
TDA2030 is very common IC for audio amplifier.
This is one chip for audio power amplifier which is good for low frequency class AB use.
Circuit Working:
Parts List:
| Category | Component | Quantity |
|---|---|---|
| Resistors | 22k 1/4 watt | 1 |
| 680k 1/4 watt | 1 | |
| 1.8Ω 1/4 watt | 1 | |
| 4.7k 1/4 watt | 2 | |
| Potentiometer 22k log | 1 | |
| Capacitors | ||
| Ceramic 100nF | 1 | |
| Electrolytic 2.2µF 25V | 1 | |
| Electrolytic 10µF 25V | 1 | |
| Electrolytic 1000µF 25V | 1 | |
| Electrolytic 100µF 40V | 1 | |
| Semiconductors | Integrated Circuit TDA2030 | 1 |
| Speaker 8Ω | 1 |
This TDA2030 amp circuit can give around 8W power (rms) to 8 ohm speaker with low sound distortion and with less than 0.1% THD when used for 24V power.
If uses 4 ohm speaker when power goes up to around 12W rms.
Distortion also goes higher for almost 3 times more but still its not very bad.
This circuit can also work with low voltage like 9V but power output will be less.
This circuit with TDA2030 IC is modern and work more fast and simple than old type of circuits.
Calculations and Formulas:
Voltage gain of non-inverting amplifier can find by this easy formula.
It work good for op-amp design:
Gain = (1 + R3 / R2)
where:
- Gain is how much output voltage (Vo) is bigger than input voltage (Vi) in op-amp circuit.
- R3 is resistor between op-amp output and inverting input.
- R2 is resistor between inverting input and ground.
Example:
We use R2 = 4.7k ohm which connects to ground
R3 = 4.7k ohm which connects to output.
Put in formula:
Gain = (1 + 4.7k / 4.7k) = 1 + 1 = 2
Meaning:
This op-amp circuit make signal 2 times bigger.
If input voltage is 1V then output will be 2V if op-amp does not go outside its range.
Important Points:
This formula is only for non-inverting amplifier.
Inverting type uses different formula.
We think op-amp has very big gain inside but it is almost unlimited.
Actual circuit may give little different gain because of some parts may not be perfect.
How to Build:
To build a Amplifier Circuit using IC TDA2030 follow the below steps for connections:
Power Source:
- Power supply give (+) and (–) voltage to right pins of TDA2030.
- Dual power supply like ±12V to ±18V is good to use.
Input Stage:
- Pin 3 non-inverting input connects to audio input signal.
- Pin 2 inverting input connect to ground.
- R1 and C1 make high pass filter.
- It helps reduce DC noise and make circuit stable.
- R2 and R3 make voltage divider which controls gain of amplifier.
- Use this formula: Gain = (1 + R3 / R2)
Output Stage:
- R4 help make output stable and set right bias.
- C2 block DC so speaker only get audio signal.
- C3 and C4 are for output filtering.
Speaker Connect:
- Connect speaker positive wire to OUT pin and negative wire to GND.
Bypass Capacitor:
- C3 and C4 help clean output and they remove any left AC noise.
Conclusion:
In Amplifier Circuit using IC TDA2030 this IC is easy to make amplifier.
We may need to change some parts to match our need.
If using more power then TDA2030 needs good heatsink to stay cool.
For more details check the datasheet or above circuits diagram.
References:
Design and implementation of a high performance AB-class amplifier using TDA2030