Introducción
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 del producto
- Audio de alta fidelidad: Delivers 50W+50W output with the TPA3116D2 chip for crystal-clear stereo sound.
- Múltiples fuentes de entrada: Supports Bluetooth 5.0, AUX (3.5mm jack), USB flash drive, and computer USB sound card (plug and play).
- Conectividad Bluetooth 5.0: Offers seamless wireless connection with a range of over 15 meters in unobstructed environments.
- Protección robusta: Incluye sobrevol.tage, bajo volumentage, overheating, DC detection, and short circuit protection for enhanced safety and durability.
- Amplia compatibilidad de altavoces: Adaptable to 10-100W, 4-8Ω speakers.
- Fuente de alimentación flexible: Operates with a DC power supply ranging from 9V to 24V.
- Diseño compacto: Measures 60x60x29mm, making it suitable for various applications and portable setups.
Contenido del paquete
Verifique que todos los componentes estén presentes en su paquete:
- ZK-502H Amptablero más duradero
- Top and Bottom Acrylic Plates
- Perilla de volumen
- Disipador de calor
- Destornillador
- Herrajes de montaje (tornillos, separadores)
- Cable adaptador de corriente continua

Image: All components included with the ZK-502H amplifier board, laid out for assembly.
Instrucciones de instalación
1. Assembly (Optional, if not pre-assembled)
- Conecte el disipador de calor al chip principal en el amptablero más duradero.
- Asegurar el 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
- Asegúrese de que 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 volumen más altotage within the specified range (e.g., 24V) is recommended for achieving higher power output.
3. Conexión de altavoz
- 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.
- El amplifier admite altavoces con una impedancia de 4-8 Ω y una potencia nominal de 10-100 W.
4. Conexión de entrada de audio
Elija uno de los siguientes métodos de entrada de audio:
- Bluetooth: No physical connection needed. Proceed to Operating Instructions for pairing.
- Auxiliar: 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.

Imagen: Arriba view of the ZK-502H amplifier board, highlighting the AUX IN, Bluetooth, USB IN, DC IN, and speaker output terminals.
Instrucciones de funcionamiento
1. Encendido y 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 ampmás duradero.
2. Control de volumen
- Rotate the large silver knob clockwise to increase volume.
- Rotate the large silver knob counter-clockwise to decrease volume.
3. Selección del modo de entrada
El amplifier automatically detects the input source. If multiple sources are connected, it will prioritize them or switch based on activity.
- Modo Bluetooth: Cuando está encendido, el 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. Emparejamiento Bluetooth
- Asegúrese de que amplifier is powered on and in Bluetooth mode (indicated by a voice prompt).
- En su dispositivo de audio (por ejemplo, teléfono inteligente, tableta), habilite Bluetooth y busque los dispositivos disponibles.
- Select "ZK-502H" from the list of devices to pair.
- Una vez emparejados, una notificación de voz confirmará la conexión. Ya puedes reproducir audio desde tu dispositivo.
Presupuesto
| Modelo del producto | 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 |
| Fuente de alimentación | DC-9 24V |
| Potencia de salida (máx.) | 50W + 50W (at 24V, 4Ω) |
| Impedancia del altavoz | 4-8 Ω |
| Potencia del altavoz | 10-100 W |
| Número de canales | 2.0 Stereo (Left and Right) |
| Versión de Bluetooth | 5.0 |
| Alcance de Bluetooth | >15 meters (unobstructed) |
| Mecanismos de Protección | sobrevoltajetage, subvol.tage, Overheating, DC Detection, Short Circuit Protection |
| Dimensiones del producto | 60 x 60 x 29 mm |
| Peso del producto | Approximately 104g (including packaging) |
Power Output Table:
| Vol. De la fuente de alimentacióntage | Salida de altavoz de 8 Ω | Salida de altavoz de 4 Ω |
|---|---|---|
| 12 V | 12W + 12W | 20W + 20W |
| 15 V | 18W + 18W | 30W + 30W |
| 19 V | 32W + 32W | 40W + 40W |
| 24 V | 38W + 38W | 50W + 50W |
Mantenimiento
- Mantener el ampMantenga la placa del elevador limpia y sin polvo. Utilice un paño suave y seco para limpiarla.
- Evite exponer el dispositivo a la humedad, temperaturas extremas o luz solar directa.
- Ensure proper ventilation to prevent overheating, especially during prolonged use at high volumes.
- No intente desmontar ni modificar el amplifier beyond the initial assembly steps, as this may void any potential warranty and could cause damage.
Solución de problemas
| Problema | Posible causa | Solución |
|---|---|---|
| No hay salida de sonido. |
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| El dispositivo Bluetooth no se puede emparejar. |
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| Sonido distorsionado. |
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Garantía y 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: Compra de CE
Modelo: ZK-502H