The ZK-502C is a high-fidelity stereo amplifier board that utilizes the TPA3116D2 chip to deliver a clean and powerful 2.0 channel audio experience. It features integrated Bluetooth 5.0 for wireless streaming and is designed with a sleek, minimalist aesthetic, making it an excellent choice for desktop audio or compact DIY speaker projects.

Specifications

• Amplifier Chip: TPA3116D2 (or equivalent CS3835E0)
• Bluetooth Version: 5.0 (up to 10 meters range)
• Operating Voltage: DC 5V to 24V
• Output Power: 50W x 2 (Stereo)
• Input Method: Bluetooth + AUX (3.5mm)
• Channel Count: 2.0 Channel (Stereo)
• 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.
• Single-Knob Operation: Features a multi-function industrial-grade encoder knob that controls power (long press) and volume adjustment (rotate), providing a smooth and premium feel.
• Filter-Grade Performance: Equipped with large-capacity high-quality capacitors and LC filtering components to ensure a stable power supply and reduce electromagnetic interference for clearer sound.
• Gold-Plated Connectors: Uses high-quality gold-plated terminals for speaker outputs and power input to ensure low-resistance connections and prevent oxidation over time.
• Advanced Thermal Dissipation: Designed with a heat-dissipation copper area on the PCB, often paired with a top-mounted heatsink, to maintain stable temperatures during peak performance.
• Bluetooth and AUX Support: Automatically switches between Bluetooth and wired AUX input; inserting a 3.5mm cable prioritizes the AUX connection.
• Comprehensive Protection: Includes built-in mechanisms to protect against overvoltage, undervoltage, overheating, and short circuits.

Power Supply Recommendation

The output power of the ZK-502C is highly dependent on the input voltage:

• 12V Supply: Suitable for 8-ohm speakers, providing moderate volume (~15W-20W per channel).
• 24V Supply: Recommended to achieve the full 50W per channel into 4-ohm speakers.
• Current: A power supply with at least 3A to 5A is recommended to ensure the board doesn't clip during high-volume playback.

Common Applications

• Building high-quality 2.0 channel desktop monitors.
• Upgrading passive bookshelf speakers into a wireless Bluetooth audio system.
• Compact audio amplification for small home offices or bedrooms.
• DIY portable "briefcase" speakers or high-end sound crates.