Stemedu 5PCS SFM-27 95DB High Decibel Alarm Siren, 12V Electronic Piezo Active Buzzer, DC 3-24V Continuous Beep Alert Sound Module for Arduino (Pack of 5)

Price: $7.99
(as of Feb 16, 2023 06:44:32 UTC – Details)

Product Description

Color: BlackIt is an active buzzer, usually used in car / safe box anti-theft burglar alarm. The mini high decibel piezo alarm can reach 100dB at 12VDC/30cm.

Rated Voltage: 12VOperating Voltage: 3-24VRated current: 15MA at 12VDCRated Current(MAX): 20mAMin Sound Output at 10 cm: 95 DBResonant Frequency: 31001500

Acoustic piezoelectric frequency: 100dB at 12VDC/30cmResonant frequency: 2.5±0.5KHZWorking temperature: -20~45 degreeStorage temperature: -20~60 degree

Dimension

Alarm Diameter: 29mm/ 1.14″ Alarm Height: 15mm/ 0.59″ 2 Mounting Holes distance: 40mm/ 1.57″ 2 Wires length: 105mm 14.13″

The structure principle of the buzzer

1. Piezoelectric buzzer

The piezoelectric buzzer is mainly composed of a multivibrator, a piezoelectric buzzer, an impedance matcher, a resonance box, and a shell. Some piezoelectric buzzers are also equipped with light-emitting diodes.

The multivibrator is composed of transistors or integrated circuits. When the power is turned on (1.5~15V DC working voltage), the multivibrator starts to vibrate and outputs 1.5~2.5kHZ audio signals, and the impedance matcher drives the piezoelectric buzzer to sound.

The piezoelectric buzzer is made of lead zirconate titanate or lead magnesium niobate piezoelectric ceramic material. Silver electrodes are plated on both sides of the ceramic sheet, and after polarization and aging treatment, they are then glued together with the brass sheet or the stainless steel sheet.

2. Electromagnetic buzzer

The electromagnetic buzzer is composed of oscillator, electromagnetic coil, magnet, vibrating diaphragm and shell. After the power is turned on, the audio signal current generated by the oscillator passes through the electromagnetic coil, causing the electromagnetic coil to generate a magnetic field. The vibrating diaphragm periodically vibrates and produces sound under the interaction of the electromagnetic coil and the magnet.

Electronic Buzzer Beep Continuous Beep for Arduino SFM-27

This buzzer is a kind of electronic buzzer with integrated structure. It uses DC voltage to supply power.

It is widely used in computers, printers, copiers, alarms, electronic toys, automotive electronic equipment, telephones, timers and other electronic products as sound devices.

Classification of buzzers Buzzers are mainly divided into two types: piezoelectric buzzer and electromagnetic buzzer.

Package included:

5 X Piezoelectric buzzer active alarm sounder

Operating Voltage
DC 6-15V DC 3-24V DC 3 – 24V AC380V DC220V DC 3.3-5.5V DC5V/3.3V

Rated Voltage
12V 12V 12V

Current Rating
@ 12VDC: ≤ 80mA 15mA @ 12VDC 10mA New Release New Release New Release

Decibel
110dB @12VDC / 30cm 100dB @12VDC / 30cm 95 dB

Model
HC-SR501 HC-SR501 HC-SR312 HC-SR505 RCWL-0516 600PCS Resistors

Delay time
0.5-200S adjustable 0.5-200S adjustable 2 seconds

Blocking time
2.5 seconds 2.5 seconds 2 seconds 2.5 seconds

Detection Rang
Within 5 meters Within 5 meters 3-5 meters Within 3 meters 5-8 meters

Working voltage
DC 4.5-20V DC 4.5-20V DC 2.7-12V DC 4.5-20V 4.0 -28.0 V

Size (l*w*h)
3.00*2.50*2.00cm 3.00*2.50*2.00cm 2.80*0.90*0.90cm 3.00*1.00*1.00cm 3.60*1.80*0.10cm

🚩 [Voltage Range]: Operating Voltage: 3-24V. Rated Voltage: 12V.
🚩 [Small Size]: Alarm Diameter: 29mm/ 1.14″, Height: 15mm/ 0.59″, with 2-wire pigtails
🚩 [95DB High Decibel]: This mini electronic beeper support DC 3-24V power supply and produce continuous high-decibel alarm sound up to 95dB
🚩 [Widely Usage]: In the car modification, DIY electronics reminder projects or other area needs sound alarm.
🚩 If any question, how to contact us? Please click “Stemedu”(you can find “Sold by Stemedu” under Buy Now button), in the new page, click “Ask a question” to email us