Stemedu 6PCS Active Buzzer SFM-20B Electric Piezo Alarm Ringer DC3-24V Continuous Beep Sound 95dB High Decibel Siren Buzzers Speaker for Ar duino

Price: $7.99
(as of Feb 19, 2023 04:19:31 UTC – Details)

Product Description

100% Brand New and High Quality

Shape: RoundColor: Black

It is an active buzzer, usually used in car / safe box anti-theft burglar alarm. The mini high decibel piezo alarm can reach 95 dB at 12V DC.

Rate Voltage: 12V DC Operating Voltage: 3 – 24V Max Current Rating:10mA Frequency: 3900±500Hz

Drive Method: Drive Circuit Built in Mounting Holes Sound:”Di” ContinuousBuzzer Type: Piezoelectric Sound Pressure Level 95 dB

Alarm Diameter:22mm/0.86″ Alarm Height:10mm/0.39” 2 Mounting Holes distance:30mm/1.18″ 2 Wires length:90mm/3.54″

Description

The active 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.

This is a piezoelectric buzzer.

Package included:6 X Piezoelectric active buzzer alarm sounder

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.

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

Rated Voltage
12V DC 12V DC 12V DC

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

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

Frequency
2.3 – 4.3 kHz 2.5±0.5KHZ 3900±500Hz

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

Operating Voltage: 3 – 24V; Sound output: 85dB to 95dB
Max Current Rating 10mA; Frequency 3300±500Hz
With 2-wire lead cable, convenient to use
Active piezo electronic buzzer module support DC 3-24V wide voltage power supply.
This active buzzer widely used in computers, printers, copiers, alarms, electronic toys, automotive electronic equipment, telephone, timer and other electronic products as a sound device.