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 |
While connecting two TDA2030 amplifiers with less expensive power transistors will results in an amplifier with a higher power output.
The component values displayed in this configuration result in a total amplifier gain of 32 dB.
TIP transistors are used to lower the speaker impedance from 4 to 2 ohms.
SGS’s TDA2030 is a strong audio amplifier.
The last amplifier in the AB class produces up to 14W at 4 ohms when powered by a +-14V source.
This audio amplifier has a well-designed power supply that can provide 35W of output.
Formulas:
Because of its great performance and simple of design the TDA2030 integrated circuit is a popular option for audio amplifiers.
Below mentioned are 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 below mentioned 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.
- Be 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 ICs for the TDA2030:
- Connect the inputs of one TDA2030 terminal to its outputs and vice versa.
- When required use the right coupling capacitors.
Connect the power transistors:
- As shown in the circuit diagram connect the TDA2030 output pins to the TIP31 and TIP32 power transistors.
- One should check that the transistors have a proper heat sink.
Connection to the Power Supply:
- Connect the circuit to the power source.
- Check that the voltage falls between the specified range such as +-14V.
Testing:
- Switch the amplifier ON then check the voltages at the important points with a multimeter.
- Be sure that no short circuits are present.
- To test the amplifiers working correctly send an audio signal by connecting a speaker to its output pin.
Adjustments:
- If required change the resistor values or other components to get the required gain and performance.
Final enclosure:
- Remember if satisfied with the performance of the circuit place it in a proper enclosure.
Conclusion:
It is important to be 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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