This 35 Watt Bridge Amplifier Circuit using TDA2030 IC show how to make 35 watt amplifier circuit, as this circuit is also very powerful.
Here, the circuit uses a special chip called TDA2030 in a different configuration to produce double the power output and make the speaker sound louder.
Hence, be careful circuit uses high voltage and it can be dangerous, so better do it with an adult or someone who knows electric work.
Also, electrician should fix it at home and this project is not for beginner.
Circuit Working:
Parts List:
| Components | 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 |
To begin with, when we connect two TDA2030 amplifiers with cheap power transistors then we can get more power output, also this circuit show amplifier gain of 32 dB.
Here, TIP transistors reduce the speaker impedance from 4 ohms to 2 ohms and the TDA2030 is a powerful audio amplifier.
Also, this AB class amplifier gives around 14W at 4 ohms when power is ±14V and with good power supply it can give output up to 35W.
Formulas:
TDA2030 is popular for audio because it work good and design is simple, also here some important formulas for TDA2030:
Output Power:
To find power output Pout it uses this formula:
Pout = (Vpeak × Ipeak)² / (8 × RL)
where:
- Vpeak is max output voltage
- Ipeak is max output current
- RL is speaker resistance
Power Loss:
To find power loss Pdiss uses this formula:
Pdiss = (VCC − VEE) × IQ
where:
- VCC is positive supply
- VEE is negative supply
- IQ is current when there is no signal
Gain is calculated as follows:
Av = Rf / Ri
where:
- Rf is feedback resistor
- Ri input resistor
Frequency Response:
TDA2030 work in 20 Hz to 20 kHz range and it depends on extra parts like resistors and capacitors.
Slew Rate:
Slew rate SR tell how fast output voltage can change; so we can find it in datasheet, as these formulas help to build and test TDA2030 circuits.
Also, values change based on our circuit and what we want, so always check datasheet for correct information.
How to Build:
To build a 35 Watt Bridge Amplifier Circuit using TDA2030 IC follow below steps for connections:
Schematic Design:
- First, make schematic for connecting two TDA2030 chips with power transistors and we can find this in datasheet.
Component Selection:
- Next, choose correct resistors, capacitors and other parts from circuit diagram and also be sure values are good for this circuit.
Circuit Assembly:
- If we use PCB then follow schematic and solder parts on board and if we use breadboard then connect all parts carefully like in diagram.
Connect the TDA2030 ICs:
- After that, join input and output of TDA2030 as shown in circuit and use correct coupling capacitors when needed.
Connect the Power Transistors:
- Then connect TDA2030 output pin to TIP31 and TIP32 transistors as shown and also be sure each transistor have proper heat sink to stop overheating.
Power Supply Connection:
- Now connect circuit to power supply and voltage must be in safe range, like ±14V.
- First, turn ON amplifier and use multimeter to check voltage at main points.
- Also, check there is no short circuit.
- Now play audio and connect speaker to output pin and see if sound comes good.
Adjustments:
- Also, if needed change resistor or capacitor to fix gain or improve sound.
Final Enclosure:
- Also, if circuit works good then put it in strong box or case for safety.
Conclusion:
Overall, making 35 Watt Bridge Amplifier Circuit using TDA2030 IC is not easy as it needs good knowledge in electronics.
Also, we need to follow safety rules and maybe use software to design, so always use good resources like datasheets and guides and work safe when handling high power circuits.