This article explains how to build a 35 watt amplifier circuit that is extra powerful.
It uses a special chip called a TDA2030 in a special way to basically double the amps output.
This makes the speaker sound much louder.
Building circuits with high voltage can be dangerous.
Do this under adult supervision and a qualified electrician should install it at home.
This project is not meant for beginners.
Circuit Working:
Parts List:
| Component | Quantity |
|---|---|
| Resistors (All resistors are 1/4 watt unless specified) | |
| R1, R4, R10, R11 = 2.2Ω | 1 each |
| R2, R3, R8 = 100k | 1 each |
| R5, R6 = 3.3kΩ | 1 each |
| R7, R9 = 1Ω | 1 each |
| Capacitors | |
| Ceramic C1 = 1.5nF | 1 |
| Ceramic C2, C3, C4, C5, C7 = 220nF | 1 each |
| Electrolytic C6 = 10μF 40V | 1 |
| Semiconductors | |
| IC1, IC2 = TDA2030 | 2 |
| Transistors | |
| T1 BD250 | 1 |
| T2 BD249 | 1 |
| T3 TIP36 | 1 |
| T4 TIP35 | 1 |
| Diodes | |
| D1 to D4 1N4001 | 4 |
| Fuses F1, F2 5A | 2 |
| Speaker 2Ω to 4Ω | 1 |
When two TDA2030 amplifiers are connected together using low cost power transistors an amplifier that is capable of supplying more power is than generated.
The component values showed in this design gives a total amplifier gain of 32 dB.
TIP transistors can lower the speaker impedance from 4 to 2 ohms.
SGSs TDA2030 is a complete audio amplifier.
The final amplifier which operates in the AB class can generate up to 14W at 4 ohms using a power supply of +-14V.
With a well designed power supply this audio amplifier has the ability to provide 35W of output.
Formulas:
The TDA2030 integrated circuit is a popular choice for audio amplifiers due to its high performance and easy to design.
Below are some some essential TDA 2030 formulas and factors to follow :
Calculating Output Power:
One can estimate the output power Pout of the TDA2030 by using the following formula:
Pout = (Vpeak × Ipeak) 2/ (8 × RL)
where,
- Vpeak is the peak output voltage swing
- Ipeak is the peak output current
- RL is the load resistance connected to the output.
Power Loss:
The following formula is used to calculate the TDA2030s power dissipation or Pdiss:
Pdiss = (VCC − VEE) × IQ
Where:
- VCC represents the supply voltage.
- VEE represents the negative supply voltage.
- IQ is the ICs quiescent current.
Gain in Voltage:
Usually the voltage gain Vg Av of the TDA2030 is provided by the following formula:
Av = Rf / Ri
where,
- Rf is the feedback resistor
- Ri is the input resistor.
Response frequency:
The TDA2030s frequency response which is usually in the audio range of 20 Hz to 20 kHz is controlled by the circuits external components like capacitors and resistors.
Slew rates:
The slew rate or SR is the maximum rate of change in output voltage and is generally mentioned in the datasheet.
Some formulas and factors are required when constructing and testing circuits based on the TDA2030 audio amplifier IC.
The exact values and calculations are affected by the circuits design and application needs.
Always refer to the datasheet for further information and application notes provided by the manufacturer.
How to Build:
To build a Simple 35 Watt Bridge Amplifier Circuit using TDA2030 IC following are the steps required to be followed:
Schematic Design:
- Generate a schematic design for connecting two TDA2030 chips using power transistors.
- This can be found in datasheets
Component Selection:
- Select the required resistors, capacitors and other components from the circuit diagram.
- Make sure the values meet the circuits requirements.
Circuit Assembly:
- If using a PCB follow the schematic to arrange and solder the components on the board.
- If using a breadboard carefully connect the components according to the schematic diagram.
Connect the TDA2030 ICs:
- Connect the outputs of one TDA2030 to the inputs of another and vice versa.
- Use the necessary coupling capacitors as needed.
Connect the power transistors:
- Connect the TDA2030 outputs pins to the power transistors TIP31 and TIP32 as shown in the circuit diagram.
- Check that the transistors have proper heat sink.
Power Supply Connection:
- Connect the power supply to the circuit.
- Ensure that the voltage is within the specified range such as +-14V.
Testing:
- Turn ON the amplifier and use a multimeter to check voltages at key points.
- Ensure that there are no short circuits.
- To test the amplifiers performance connect a speaker to its output pin to send an audio signal.
Adjustments:
- If required change the resistor values or other components to get the required gain and performance.
Final enclosure:
- When one is satisfied with the performance, may place the circuit in a proper enclosure.
Conclusion:
It is important to make clear that developing and producing such high power audio amplifiers requires a full understanding of electronics, safety considerations and possible use of modeling tools.
When working on amplifier circuits always use reliable resources, datasheets and guidelines to take care when dealing with high power electronics.
Also following safety standards and laws are essential.
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