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2.1 Amplifier with TDA7265: Power and Versatility for Audio Projects. The 2.1 amplifier circuit based on the TDA7265 IC is an efficient and practical solution for those looking to build a sound system with three audio outputs: two stereo channels (left and right) and a dedicated subwoofer channel. This project is ideal for home audio applications, such as multimedia speaker systems or home theater setups.
Key Features
- No Built-in Low-Pass Filter for Subwoofer: A preamplifier with this function must be used, or the SW output can be configured on a computer.
- Adjustable Subwoofer Preamp: Includes a bass filter circuit adjustable between 30Hz and 230Hz.
- Stereo Tone Control + Subwoofer Preamp: Allows fine-tuning of audio output.
TDA7265 Specifications
- The TDA7265 is a Class AB power amplifier with the following main specifications:
- Output Power: 25W per channel (in stereo configuration, with an 8Ω load and ±20V symmetrical power supply).
- Power Supply: Operates with symmetrical voltages from ±5V to ±25V.
- Integrated Protections: Includes short-circuit and overheating protection.
- Additional Functions: Features mute and standby controls.
Circuit Design
- The presented circuit uses two TDA7265 ICs:
- Subwoofer Channel: One IC operates in mono mode, using both internal channels in a bridge configuration to double the available power for the subwoofer.
- Stereo Channels: The second IC is configured in stereo mode, providing audio for the left and right channels.
Schematic TDA7265 2.1 audio power amplifier
Main Components
- Power Supply:
- Rectifier bridge (B1) and electrolytic capacitors (C1, C2) stabilize the voltage.
- Symmetrical power supply (± V) is required, using a dual transformer.
Amplifier Functionality
- Signal Distribution:
- Independent subwoofer channel.
- Stereo input
- Amplification:
- Each IC amplifies signals according to its configuration (stereo or bridge).
- Outputs:
- Independent outputs for left, right, and subwoofer channels.
Assembly Tips
- Proper Power Supply:
- Use a symmetrical power source suitable for the load (a transformer of 9+9V to 15+15V is recommended).
- Thermal Dissipation:
- Install heat sinks on the ICs to prevent overheating.
- Noise Reduction:
- Use short, shielded connections to minimize audio interference.
Applications
- Home sound systems
- Multimedia speaker systems
- DIY projects for electronics enthusiasts
With the TDA7265, you can build a compact, efficient amplifier with excellent sound quality, perfect for applications requiring a 2.1 system with good frequency separation.
For detailed assembly instructions and diagrams (e.g., PCB layouts), refer to provided schematics or download files related to this project.
By leveraging this design with TDA7265 ICs, you can create an efficient and versatile audio amplifier tailored for high-quality sound reproduction in various environments.
BOM TDA7265 2.1 audio power amplifier
Last update: 14/01/2025 19:50
| Componente | Valor | Descrição | Quantidade |
| Resistors 1/4W | |||
| R2, R4, R21 | 1k | Brown, black, red, gold | 3 |
| R3 | 1.5M | Brown, green, green, gold | 1 |
| R6 | 15K | Brown, green, orange, gold | 1 |
| R8, R9 | 18k | Brown, gray, orange, gold | 2 |
| R10, R13 | 36k | Orange, blue, orange, gold | 2 |
| R11, R12, R14, R15 | 560 | Green, blue, brown, gold | 4 |
| R16, R17, R18, R19 | 4.7 | Yellow, violet, gold, gold | 4 |
| Capacitors | |||
| C3, C4, C12, C13, C14, C16 | 100n (104) | Ceramic Capacitor | 6 |
| C5, C11, C15 | 1µF (105) | Film Capacitor | 3 |
| C6, C7 | 10µF/25V | Electrolytic Capacitor | 2 |
| C8, C9, C18 | 220p (221) | Ceramic Capacitor | 3 |
| C11A | 1µf (105) | Electrolytic Capacitor | 1 |
| C17 | 5,6n (562) | Film Capacitor | 1 |
| Semiconductors | |||
| B1 | KBL608 | Bridge rectifier | 1 |
| D1 | 1n4148 | Diode | 1 |
| LED1 | LED3MM | Led 3 mm red | 1 |
| IC1, IC2 | TDA7265 | TDA7265 25wx2@8 Ω Class AB Multiwatt-11-V 2.1 Power Stereo Audio Amplifier Circuit |
2 |
| Miscellaneous | |||
| CN1 | InSub | XH 2.54 mm 2-pin connector | 1 |
| CN3 | In | XH 2.54 mm 2-pin connector | 1 |
| J4 | OUTR | Terminal block 5.08 mm 2 pin — Right output | 1 |
| J2 | SUBOUT | Terminal block 5.08 mm 2 pin — Left Output | 1 |
| J3 | AC | Terminal block 5.08 mm 3 pin — Supply | 1 |
| J5 | IN1 | Terminal block 5.08 mm 2 pin — Subwoofer input | 1 |
| J6 | in2 | Terminal block 5.08 mm 3 pin — Stereo input | 1 |
| Solder, wires, PCB, box, power supply, etc. | |||
Download files link and notes
Download PCB in Gerber + BOM + Centroid file + PDF + PNG
