The ZK-TB21 is a high-fidelity 2.1 channel amplifier board that utilizes the TPA3116D2 chip to deliver a powerful audio experience. It features integrated Bluetooth 5.0 for seamless wireless streaming and a dedicated subwoofer channel to provide deep, impactful bass. This module is a popular choice for building custom home audio systems or high-performance portable speakers.

Specifications

• Amplifier Chip: TPA3116D2 (or equivalent CS3835E0)
• Bluetooth Version: 5.0 (up to 10 meters range)
• Operating Voltage: DC 12V to 24V
• Output Power: 50W x 2 (Stereo) + 100W (Subwoofer)
• Input Method: Bluetooth + AUX (3.5mm)
• Channel Count: 2.1 Channel
• Speaker Impedance: 4 ohm to 8 ohm

Features

• Equivalent IC Support: Some versions of this module may feature the CS3835E0 chip, which is a functional equivalent to the TPA3116D2, offering comparable performance and reliability.
• Five-Knob Precision Tuning: Equipped with dedicated potentiometers for Stereo Volume, Stereo Treble, Stereo Bass, Subwoofer Frequency, and Subwoofer Volume.
• Advanced Audio Processing: The adjustable subwoofer frequency (crossover) allows you to precisely define the range of the bass output to match your specific subwoofer driver.
• High-Efficiency Cooling: Features a massive integrated aluminium heatsink that covers the power chips, ensuring stable operation even at high volume levels.
• Flexible Audio Input: Supports both high-speed Bluetooth 5.0 for wireless convenience and a standard 3.5mm AUX jack for wired audio sources.
• Protection Circuitry: Includes built-in safeguards against overvoltage, undervoltage, overheating, and short circuits to protect both the module and your speakers.
• Ease of Assembly: Includes a protective top and bottom acrylic plate and all necessary hardware for a clean, professional-looking finished project.

Power Supply Recommendation

The performance of the ZK-TB21 is highly dependent on the power supply:

• 12V Supply: Suitable for small speakers and lower volumes.
• 24V Supply: Recommended to reach the full 200W total output.
• Current: A power supply with at least 5A to 10A is highly recommended to provide enough "headroom" for heavy bass transients.

Common Applications

• Building high-fidelity 2.1 home theatre or computer speaker systems.
• Creating custom Bluetooth "Ammo Can" or wooden crate boomboxes.
• Upgrading passive speakers into a modern, wireless 2.1 audio setup.
• Dedicated audio amplification for gaming stations and media rooms.