Introdución
The EC Buying ZK-502H is a high-fidelity 2.0 stereo digital power amplifier module designed to deliver clear and powerful audio. Featuring the TPA3116D2 chip, this amplifier board provides 50W+50W output and supports multiple audio input sources including Bluetooth 5.0, AUX, and USB. It is equipped with various protection mechanisms to ensure stable and secure performance.
Características do produto
- Audio de alta fidelidade: Delivers 50W+50W output with the TPA3116D2 chip for crystal-clear stereo sound.
- Multiple Input Sources: Supports Bluetooth 5.0, AUX (3.5mm jack), USB flash drive, and computer USB sound card (plug and play).
- Conectividade Bluetooth 5.0: Offers seamless wireless connection with a range of over 15 meters in unobstructed environments.
- Protección robusta: Inclúe overvoltage, subvoltage, overheating, DC detection, and short circuit protection for enhanced safety and durability.
- Wide Speaker Compatibility: Adaptable to 10-100W, 4-8Ω speakers.
- Fonte de alimentación flexible: Operates with a DC power supply ranging from 9V to 24V.
- Deseño compacto: Measures 60x60x29mm, making it suitable for various applications and portable setups.
Contido do paquete
Comprobe que todos os compoñentes estean presentes no seu paquete:
- ZK-502H AmpConsello máis vivo
- Top and Bottom Acrylic Plates
- Botón de volume
- Disipador de calor
- Desaparafusador
- Mounting Hardware (screws, standoffs)
- Cable adaptador de alimentación CC

Image: All components included with the ZK-502H amplifier board, laid out for assembly.
Instrucións de configuración
1. Assembly (Optional, if not pre-assembled)
- Attach the heat sink to the main chip on the ampplaca de eliminación.
- Asegure o amplifier board between the two acrylic plates using the provided standoffs and screws.
- Install the volume knob onto the potentiometer shaft.
2. Conexión de alimentación
- Asegurar o amplifier is switched off and the volume knob is set to minimum.
- Connect a DC power supply (9-24V) to the DC IN port (labeled DC9-24V). Use the provided DC power adapter cable if necessary.
- Importante: Usando un volume superiortage within the specified range (e.g., 24V) is recommended for achieving higher power output.
3. Conexión de altofalantes
- Connect your passive speakers to the speaker output terminals (labeled L+, L-, R+, R-).
- Ensure correct polarity: positive (+) to positive, negative (-) to negative for each channel.
- O amplifier supports speakers with an impedance of 4-8Ω and power rating of 10-100W.
4. Conexión de entrada de audio
Escolla un dos seguintes métodos de entrada de audio:
- Bluetooth: No physical connection needed. Proceed to Operating Instructions for pairing.
- AUX: Connect an audio source (e.g., smartphone, MP3 player) to the 3.5mm AUX IN jack using an audio cable.
- USB: Insert a USB flash drive into the USB IN port or connect the amplifier to a computer via USB for use as a sound card.

Imaxe: Arriba view of the ZK-502H amplifier board, highlighting the AUX IN, Bluetooth, USB IN, DC IN, and speaker output terminals.
Instrucións de funcionamento
1. Acendido/apagado
- Press the ON/OFF button to power on the amplifier. A blue indicator light will illuminate.
- Press the ON/OFF button again to power off the ampmáis vivo.
2. Control de volume
- Rotate the large silver knob clockwise to increase volume.
- Rotate the large silver knob counter-clockwise to decrease volume.
3. Selección do modo de entrada
O amplifier automatically detects the input source. If multiple sources are connected, it will prioritize them or switch based on activity.
- Modo Bluetooth: Cando se acende, o amplifier will enter Bluetooth pairing mode. A voice prompt will confirm "Bluetooth Mode".
- Modo AUX: If an AUX cable is connected and playing audio, the amplifier will switch to AUX input.
- Modo USB: If a USB flash drive is inserted or connected to a computer, the amplifier will switch to USB input.
4. Emparellamento Bluetooth
- Asegurar o amplifier is powered on and in Bluetooth mode (indicated by a voice prompt).
- On your audio device (e.g., smartphone, tablet), enable Bluetooth and search for available devices.
- Select "ZK-502H" from the list of devices to pair.
- Once paired, a voice prompt will confirm the connection. You can now play audio from your device.
Especificacións
| Modelo de produto | ZK-502H |
| Solución de chip | TPA3116D2 (with AM interference suppression) |
| Entrada de audio | Bluetooth 5.0, AUX (3.5mm), USB Flash Drive, Computer USB Sound Card |
| Fonte de alimentación | DC 9-24V |
| Potencia de saída (máx.) | 50W + 50W (at 24V, 4Ω) |
| Impedancia do altofalante | 4-8Ω |
| Potencia do altofalante | 10-100 W |
| Número de canles | 2.0 Stereo (Left and Right) |
| Versión Bluetooth | 5.0 |
| Alcance Bluetooth | >15 meters (unobstructed) |
| Mecanismos de protección | Sobrevoltage, Undervoltage, Overheating, DC Detection, Short Circuit Protection |
| Dimensións do produto | 60 x 60 x 29 mm |
| Peso do produto | Approximately 104g (including packaging) |
Power Output Table:
| Alimentación Voltage | 8Ω Speaker Output | 4Ω Speaker Output |
|---|---|---|
| 12 V | 12W + 12W | 20W + 20W |
| 15 V | 18W + 18W | 30W + 30W |
| 19 V | 32W + 32W | 40W + 40W |
| 24 V | 38W + 38W | 50W + 50W |
Mantemento
- Manteña o ampMantén a placa do transformador limpa e libre de po. Usa un pano suave e seco para a limpeza.
- Evite expoñer o dispositivo á humidade, a temperaturas extremas ou á luz solar directa.
- Ensure proper ventilation to prevent overheating, especially during prolonged use at high volumes.
- Non intente desmontar nin modificar o amplifier beyond the initial assembly steps, as this may void any potential warranty and could cause damage.
Resolución de problemas
| Problema | Causa posible | Solución |
|---|---|---|
| Sen saída de son. |
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| O dispositivo Bluetooth non se pode emparellar. |
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| Son distorsionado. |
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Garantía e Soporte
For product support, technical assistance, or warranty inquiries, please contact EC Buying customer service through the retailer where the product was purchased. Please retain your proof of purchase for any warranty claims.
Fabricante: Compras da CE
Modelo: ZK-502H