• Drive Type: Piezo Discs
• Resonant frequency(kHz): 3.0~5.0+/- 0.5 KHz
• Resonant impedance (ohms): 300 max
• Diameter: 10mm/ 0.39 inches
• Thickness: 0.3mm/ 0.01 inches
• Wire Length: 40mm/ 1.57 Inches
• Material: Brass
• Color: As shown

Hall effect sensor is transducing devices used to detect and generate a voltage when in the presence of a magnetic field. They are designed to induce a voltage as an output when a magnetic field is present at its input. The output voltage can be variable depending on the magnitude of the magnetic field. Hall effect sensors, as they name states are effect sensors, which can be used to sense different categories, like speed, position of objects, rotational speed or frequency and be used as a fault detector. They can be used to detect a time-varying current, as time-varying current produce magnetic fields, which can then be sensed by the Hall effect transducer and produce a voltage with some proportion the amount of magnetic field present at the sensor.

• The default ‘max gain’ is 60dB, but can be set to 40dB or 50dB by jumpering the Gain pin to VCC or ground.
• You can change the Attack/Release ratio, from the default 1:4000 to 1:2000 or 1:500.
• The ouput from the amp is about 2Vpp max on a 1.25V DC bias, so it can be easily used with any Analog/Digital converter that is up to 3.3V input. If you want to pipe it into a Line Input, just use a 1uF blocking capacitor in series.

• Product type: Piezoelectric Transducer Piezo Sensor
• Colour: copper and silver
• Dimension: 27 mm
• Weight: 2 g
• Sheet material: bronze
• Package contains: 1 x piezoelectric sensor

• Item Name: Piezoelectric Shock Tap Sensor Vibration Switch Module
• Item Type: Vibration Switch Sensor Module
• Working Voltage: 5.0V (DC)
• Interface Type: AD/DO
• AO: Analog Signal Output
• DO: TTL Level Output
• Working Temperature: -10 C ~ +70 C
• Size: Approx. 20 x 20mm / 0.8 x 0.8in
• Weight: 4.5 g / 0.2 oz(approx.)
• Test Method and Wiring:
• G (GND):: Power ground
• V (VCC): Operating voltage 5V (DC)
• ADO: Analog signal output
• According to the vibration intension, the higher the output voltage, the higher the vibration amplitude sensitivity can be adjusted by the potentiometer (the left turn sensitivity is low, the right turn sensitivity is high). The high sensitivity output can be adjusted to respond with a mouth blow or a tap with a hand.
• DO: TTL level output. Output signal LED indication. TTL output valid signal is high level, output control power

• Using high-sensitivity switch SW 520D as the sensor.
• The module is equipped with fixed bolt hole for convenient installation.
• Using LM393 wide voltage comparator, clean signal, good waveform, strong driving ability with output of more than 15 mA.
• The working voltage of 3.3V to 5V.
• Small PCB size:3.2cm x 1.4cm.
• Digital output form: digital switch output (0 and 1).

• High output: 120DB alarm siren
• Standard 9 volt battery operation
• Required no special installation
• Rugged high impact ABS construction
• Provide alarm siren operation from contact with door or from movement vibration.