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CA-502MT (ZK-502MT) 50W+50W Bluetooth 5.0 Audio Amplifier Board

Specification	Details
Model	CA-502MT / ZK-502MT
Output Power	50W + 50W (at 24V, 4Ω)
Bluetooth Version	5.0 (Up to 15m range)
Input Methods	Bluetooth + 3.5mm AUX
Working Voltage	DC 9V to 24V (3A or above recommended)
Compatible Speakers	15W–100W, 4Ω–8Ω
SNR	>90 dB

Price

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₹ 500.00

(Tax included)

Barcode: 1049410

Product Description

The CA-502MT is engineered for versatility, offering seamless Bluetooth 5.0 connectivity alongside a standard 3.5mm AUX input. The board is built on a high-grade PCB and includes a dedicated aluminum heatsink to ensure stable operation during extended playback. Its "inductor-free" design (using the HT326C or TPA3116D2 chip depending on the version) helps maintain a small footprint while delivering high-fidelity audio with AM interference suppression.

Key Features

Dual-Mode Input: Easily switch between wireless streaming and wired sources like PCs or MP3 players.
Precision Tone Control: Dedicated knobs for Treble and Bass let you customize the sound signature without needing external equalizers.
Industrial Protection: Built-in safeguards against overheating, overcurrent, and short-circuits protect both the module and your speakers.
Wide Power Compatibility: Works with standard 12V to 24V DC power adapters, including common laptop power bricks.
Plug-and-Play Assembly: Includes an acrylic protective shell, knobs, and a screwdriver for a quick, "no-solder" casing setup.

Technical Details

Power Scaling: 12V supply yields ~12W–20W per channel; 24V is required for the full 50W output.
Dimensions: Approx. 89mm x 60mm x 21mm (with shell).
Net Weight: ~80g.

Prototyping and Engineering Tips from Robogears

Power Selection: To achieve the maximum 50W output, use a 24V 5A power supply. A 12V supply is sufficient for smaller 3-4 inch desktop speakers but will distort at high volumes.
Avoiding Distortion: If you hear "clipping" when turning up the bass, reduce the total volume. Distortion often occurs when the power supply cannot keep up with the peak energy demands of the low-end frequencies.
Antenna Hack: For improved range in metal enclosures, the board features a solder joint for an external Bluetooth antenna.
Input Priority: Bluetooth is typically the preferred mode. To use the AUX input, ensure that the Bluetooth connection from your device is disconnected to avoid signal conflicts.

Package Includes

1 x CA-502MT Bluetooth Amplifier Module
1 x Acrylic Shell Set (Upper & Lower covers)
3 x Potentiometer Knobs
Assembly Accessories (Screws, Copper Pillars, Screwdriver)

Disclaimer

Avoid using 24V battery packs that may exceed 24.5V when fully charged, as this can trigger the over-voltage protection or damage the chip. Always verify the DC polarity before connecting power.

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