ZK-502C HIFI Bluetooth 5.0 Amplifier Board 50W×2 TPA3116D2 Stereo Class D Audio Module with AUX Input Filter Inductor & Free DC Cable

Product Description ZK-502C premium HIFI-grade digital amplifier board adopts original **TI TPA3116D2** chip with 1.2MHz high modulation frequency and <0.1% low distortion at high power output, delivering pure and natural HIFI sound quality. It integrates Bluetooth 5.0 and AUX dual input modes, equipped with a volume potentiometer with integrated power switch, perfect for DIY speaker projects. Onboard filter inductor ensures round and clear sound. High-quality copper DC connector and fence-type terminals withstand high current without overheating, providing safe and reliable wiring. A free DC head cable is included for easy power connection without additional adapters. With solid materials and excellent cost-performance, it is the ideal choice for HIFI music enthusiasts to build DIY speakers and upgrade audio systems.

Technical Specifications - Model: ZK-502C - Main Chip: Original TI TPA3116D2 - Bluetooth Version: 5.0 - Modulation Frequency: 1.2MHz - Total Harmonic Distortion (THD): <0.1% @ high power output - Input Modes: Bluetooth 5.0 / 3.5mm AUX - Output Power: 50W×2 Stereo - Power Supply: DC 12V-24V - Control Method: Volume potentiometer with integrated power switch - Connectors: Copper DC power interface + Fence-type speaker terminals - Included Accessories: Heat sink with 3M thermal adhesive + DC head power cable - Shell Version Extra: Plastic shell + Screwdriver (self-assembly required)

Core Advantages - ✅ **Original TI TPA3116D2 chip**: 1.2MHz high modulation frequency, <0.1% low distortion, true HIFI sound quality - ✅ **2-in-1 input**: Bluetooth 5.0 + AUX, supports both wireless and wired audio sources - ✅ **Onboard filter inductor**: Effectively filters high-frequency noise, delivers round and clear sound - ✅ **Integrated control**: Volume adjustment + power switch in one, extremely convenient for DIY speakers - ✅ **Premium connectors**: Copper DC interface withstands high current without overheating; fence-type terminals ensure secure wiring and prevent short circuits - ✅ **Free DC head cable**: No additional adapters needed, easy to connect to any power source - ✅ **Bluetooth 5.0 technology**: Higher transmission efficiency, longer distance and stable connection - ✅ **Solid build quality and excellent cost-performance, designed for HIFI music lovers**

⚠️ CRITICAL USAGE INSTRUCTIONS 1. **Heat Sink Installation**: **MUST paste the included heat sink with 3M thermal adhesive onto the TPA3116D2 chip** (refer to product pictures). The 3M thermal adhesive provides better thermal conductivity as temperature increases, ensuring proper chip cooling. 2. **Power Switch Explanation**: The power switch on the board is a **standby switch only**. After turning it off, the module remains in low-power standby mode. To completely cut off power for long-term storage, please unplug the DC power plug. 3. Use a stable DC 12V-24V power supply with sufficient current capacity 4. Never short circuit the speaker output terminals to each other or to ground 5. Always connect speakers and audio source first before powering on the amplifier board

Applicable Scenarios - DIY HIFI bookshelf and desktop speakers - Upgrade old wired speakers to wireless Bluetooth - Desktop audio systems - Car audio modification - Home theater satellite speakers - Portable Bluetooth speakers

Package List 1 × ZK-502C TPA3116D2 HIFI Bluetooth 5.0 Amplifier Board 1 × Heat sink with 3M thermal adhesive 1 × DC head power cable *For shell version: Additional 1 × Plastic shell + 1 × Screwdriver (self-assembly required) *For more details, please refer to product pictures or contact our customer service.

Notes 1. Slight 1-2mm size deviation exists due to manual measurement 2. Item color may have minor differences influenced by different monitor displays and lighting conditions 3. For best sound quality, use high-quality shielded audio cables