Looking for superior sound quality in a compact form? The ZK-502C Class D digital amplifier board delivers powerful, clear, and round sound with a THD as low as 0.1%, even during long periods of high output. Supporting both Bluetooth 5.0 and 3.5mm AUX input, this dual-channel amplifier is perfect for driving 4Ω–8Ω passive speakers in your DIY audio projects.
Key Features
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Bluetooth 5.0 and 3.5mm AUX input for flexible audio sources
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50W x 2 high-power stereo output (supports 30W–200W speakers)
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Wide input voltage: DC 5V–27V (5.5×2.1mm jack)
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Onboard power switch and volume control with LED indicator
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Built-in protection: overvoltage, undervoltage, overheating, short circuit, and DC detection
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HIFI sound quality with low distortion, even at high volume
Input & Output Ports
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Input: Bluetooth 5.0 / 3.5mm AUX jack
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Output: Left and Right Speaker Terminals (R+, R−, L+, L−)
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Power Input: DC 5–27V (center-positive plug)
Technical Specifications
| Parameter | Description |
|---|---|
| Output Power | 50W × 2 (max) |
| Audio Input | AUX + Bluetooth 5.0 |
| Compatible Speakers | 4Ω–8Ω, 30W–200W |
| Bluetooth Range | Up to 15 meters (without obstacles) |
| Protection Features | Overvoltage, undervoltage, thermal, short-circuit, DC detection |
Example Power Output at Various Voltages:
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12V: 4Ω/20W×2, 8Ω/12W×2
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15V: 4Ω/>30W×2, 8Ω/18W×2
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19V: 4Ω/>45W×2, 8Ω/32W×2
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24V: 4Ω/>55W×2, 8Ω/38W×2
Package Includes:
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1× ZK-502C Bluetooth Amplifier Board
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2× Acrylic Protective Panels
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1× Screwdriver
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1× Heat Sink
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1× 20cm Power Wire
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1× Volume Knob
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1× Accessory Kit
Ideal For:
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Raspberry Pi audio projects
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DIY Bluetooth speaker systems
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Home stereo upgrades
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Compact wireless audio setups