Description
CA-TB21 2.1 Channel Bluetooth Subwoofer Amplifier Board 12–24V (2x50W + 100W)
The CA-TB21 2.1 Channel Bluetooth Amplifier Board is a powerful Class-D digital audio amplifier designed for DIY home speaker systems and subwoofer setups. Built around the reliable TPA3116D2 amplifier chipset, this board delivers 50W + 50W stereo output for satellite speakers and up to 100W for a subwoofer, producing clear sound and deep bass.
The amplifier supports Bluetooth 5.0 wireless audio streaming, AUX input, and USB playback, making it versatile for multiple audio sources such as smartphones, laptops, and media players. It features multiple control knobs for volume, bass, treble, and subwoofer frequency, allowing precise sound tuning for the best listening experience.
Designed for DIY audio projects and home theatre systems, the CA-TB21 amplifier board operates on a 12V–24V DC power supply, making it compatible with SMPS power supplies, battery systems, and DIY speaker builds.
Key Features
• Powerful 2.1 channel audio output (50W + 50W + 100W)
• Built-in Bluetooth 5.0 wireless audio receiver
• High-performance TPA3116D2 Class-D amplifier chip
• Dedicated subwoofer output with frequency control
• Independent bass, treble, and volume adjustment knobs
• Supports AUX (3.5mm) and USB audio playback
• Low distortion with high efficiency Class-D amplification
• Built-in over-voltage, under-voltage, short-circuit and thermal protection
• Compatible with DIY speaker systems and home audio projects
• Compact design with heat sink for efficient cooling
Technical Specifications
| Parameter | Specification |
|---|---|
| Model | CA-TB21 |
| Amplifier Type | Class-D Audio Amplifier |
| Amplifier Chip | TPA3116D2 |
| Channel Configuration | 2.1 Channel |
| Output Power | 50W + 50W (Stereo) + 100W (Subwoofer) |
| Input Voltage | DC 12V – 24V |
| Bluetooth Version | Bluetooth 5.0 |
| Audio Inputs | Bluetooth, AUX (3.5mm), USB |
| Speaker Impedance | 4Ω – 8Ω |
| Control Knobs | Volume, Bass, Treble, Subwoofer Volume, Frequency |
| Protection Features | Over-voltage, Under-voltage, Overheat, Short-circuit |
| Capacitor | 6800µF / 35V |
| Cooling | Aluminium Heat Sink |
Applications
• DIY home theatre systems
• Bluetooth speaker projects
• Subwoofer amplifier systems
• Car audio DIY builds
• Workshop audio systems
• Portable speaker systems
• Desktop audio amplifiers
• Electronics hobby projects
• Educational audio electronics projects
Precautions
• Use DC power supply only (12V-24V) – do not connect AC directly
• Ensure correct polarity when connecting power
• Use proper speaker impedance (4Ω–8Ω)
• Provide adequate ventilation for heat dissipation
• Avoid short-circuiting speaker outputs
• Do not exceed the recommended voltage range