1. Introducció
This manual provides instructions for the proper installation, operation, and maintenance of the uxcell SFM-27 Active Electronic Buzzer. This device is designed to produce a continuous sound alarm when a DC voltage between 3V and 24V is applied. Please read this manual thoroughly before using the product to ensure safe and efficient operation.
2. Producte acabatview
The uxcell SFM-27 is an active electronic buzzer featuring a plastic housing and two pre-attached wires for easy connection. It is designed for various industrial and electronic applications where an audible alert is required.
Característiques principals:
- Vol. Amplitage Rang: Operates on DC 3V to 24V.
- High Sound Output: Produces a continuous sound at 100dB.
- Cablejat fàcil: Equipped with black and red wires for straightforward connection.
- Construcció duradora: Housed in a plastic casing.
- Disseny compacte: Suitable for integration into various systems.
Components:
- Electronic Buzzer Unit (SFM-27)
- Red Wire (Positive Terminal)
- Black Wire (Negative Terminal)
- Mounting Holes (for secure installation)

Figura 2.1: Frontal view of the uxcell SFM-27 Active Electronic Buzzer, showing the sound output grille and attached red and black power wires.
3. Especificacions
| Paràmetre | Valor |
|---|---|
| Nom del producte | Electronic Buzzer |
| Model núm. | SFM-27 |
| Sound-making Type | So continu |
| Voltage | DC 3-24V |
| Corrent nominal | 15 mA |
| Pressió sonora | 100 dB |
| Temperatura de funcionament | -20 °C a +45 °C |
| Overall Size (L*W*H) | 47 x 30 x 14 mm / 1.85 x 1.14 x 0.55 polzades |
| Mounting Holes (L*W) | 3.5 x 4 mm / 0.14 x 0.16 polzades |
| Distància del forat de muntatge | 39 mm / 1.5 polzades |
| Longitud del cable | 11 cm / 4.3 polzades |
| Freqüència de ressonància | 2.5 ± 0.5 KHz |
| Material exterior | Plàstic |
| Color | Blanc |
| Pes (per unitat) | 34 g |

Figure 3.1: Dimensions of the uxcell SFM-27 Active Electronic Buzzer, indicating mounting hole spacing and overall size.
4. Informació de seguretat
Si us plau, observeu les següents precaucions de seguretat per evitar lesions o danys al producte:
- Voltage Compatibilitat: Assegureu-vos que la font d'alimentació voltage is within the specified DC 3V-24V range. Applying incorrect voltage can damage the buzzer.
- Polaritat: Connect the red wire to the positive (+) terminal and the black wire to the negative (-) terminal of the DC power source. Incorrect polarity will prevent the buzzer from functioning.
- Cablejat: All wiring should be performed by a qualified individual or with proper knowledge of electrical connections. Ensure connections are secure to prevent short circuits.
- Medi ambient: Do not expose the buzzer to extreme temperatures, moisture, or corrosive environments beyond its operating specifications.
- Nivell de so: The buzzer produces a loud sound (100dB). Avoid prolonged exposure to the sound at close range to prevent hearing discomfort.
- Nens: Mantingueu el dispositiu fora de l'abast dels nens.
5. Configuració i instal·lació
Follow these steps to set up and install your electronic buzzer:
- Preparació de la ubicació de muntatge: Choose a suitable location for the buzzer. The buzzer features two mounting holes with a distance of 39mm (1.5 inches) between them.
- Secure the Buzzer: Use appropriate screws (not included) to securely fasten the buzzer to your chosen surface through the mounting holes.
- Connectar l'alimentació:
- Identify the red wire and the black wire extending from the buzzer.
- Connecteu el fil vermell al terminal positiu (+) of your DC power supply (3V-24V).
- Connecteu el filferro negre al terminal negatiu (-). of your DC power supply.
- Ensure all connections are firm and insulated to prevent short circuits.
- Funcionalitat de prova: Once wired, apply power to the circuit. The buzzer should emit a continuous sound. If it does not, refer to the Troubleshooting section.
6. Funcionament
The uxcell SFM-27 Active Electronic Buzzer is designed for simple operation. It functions as a direct alarm device:
- When a DC voltage within the 3V-24V range is applied to its terminals with correct polarity, the buzzer will immediately emit a continuous sound at approximately 100dB.
- The sound will cease when the power supply is disconnected or interrupted.
- This buzzer produces a continuous tone and does not have adjustable volume or tone patterns.
7. Manteniment
The uxcell SFM-27 Active Electronic Buzzer requires minimal maintenance:
- Neteja: Periodically wipe the exterior of the buzzer with a soft, dry cloth to remove dust. Do not use harsh chemicals or abrasive cleaners.
- Inspecció: Regularly check the wiring for any signs of damage, fraying, or loose connections. Ensure the mounting remains secure.
- Medi ambient: Ensure the operating environment remains within the specified temperature and humidity ranges to prolong the life of the device.
8. Solució De Problemes
If the buzzer does not function as expected, refer to the following troubleshooting guide:
| Problema | Causa possible | Solució |
|---|---|---|
| No sound from buzzer |
|
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| So feble o intermitent |
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9. Garantia i Suport
For warranty information and customer support, please refer to the documentation provided at the time of purchase or contact your retailer. You may also visit the official uxcell brand store for additional product information and support resources.
uxcell Brand Store: https://www.amazon.com/stores/uxcell/page/9C5CFA37-6CB6-400F-AA4A-658A763458C5