DAJUNGUO ZK-TB21 Power Amplifier Board — Bluetooth 5.1, 2.1 Channel, 50W x 2 + 100W, DC 12-24V

Overview

The DAJUNGUO ZK-TB21 is a compact power amplifier board crafted for flexible 2.1 channel systems. Built around the TPA3116D2 chip, it aims to deliver clean, controlled sound even during demanding sessions. With a wide DC operating range of 12–24V, this module fits a range of DIY projects—from bookshelf setups and home cinemas to desktop audio rigs. Its thoughtful design invites experimentation, pairing well with both modern wireless sources and traditional wired devices.

Key advantages you can expect

• Low distortion under load: THD stays below 0.1% at higher power, supporting clear, faithful playback across genres.
• Versatile inputs: Bluetooth 5.1 plus a 3.5 mm AUX provide wireless streaming or wired connections to smartphones, TVs, and laptops.
• Enhanced wireless stability: An external antenna base (U.FL/IPEX option) helps maintain a steadier Bluetooth link in challenging spaces.
• Built-in protections: Short-circuit, over-current, over-heat, and anti-reverse safeguards help protect both the board and connected speakers during use.
• Reliable after-sales support: DAJUNGUO offers 7x24 hours after-sales assistance to address questions or concerns promptly.

Real-world use cases

Imagine pairing the ZK-TB21 with compact bookshelf speakers for a richer TV setup, or integrating it into a PC audio rig to elevate music and gaming soundscapes. The 2.1 channel layout splits power across two main channels while a subwoofer channel adds bass depth. The dual-input design lets you switch between Bluetooth streams and wired sources without swapping equipment.

For DIY enthusiasts, the ZK-TB21 supports flexible configurations: you can build a small living room audio system, a dedicated gaming PC speaker array, or a custom multi-room setup with scalable power delivery. The 12–24V operating range makes it adaptable to many power supplies, from compact wall adapters to larger DC rails.

At-a-glance specifications

• Inputs: Bluetooth 5.1 and 3.5 mm AUX
• Output: 2.1 channel — 50W per channel + 100W sub
• Power supply: DC 12–24V
• Protection: Short-circuit, over-current, over-heat, anti-reverse
• Connectivity enhancement: Optional external 2.4G Bluetooth antenna base

What you gain

With its combination of robust power, flexible connectivity, and protective design, the ZK-TB21 helps you explore richer audio possibilities at home or in a workshop. The device invites experimentation with various speaker pairings and room layouts, all while emphasizing stable performance and user-focused support.