External Drive Magnetic Sensors / Electronic Wireless Door Lock
Place of Origin:Jiangsu China (Mainland)
Min. Sound Output at 10cm (dB)
Rated Voltage (Vp-p)
Operating Voltage (Vp-p)
Resonant Frequency (Hz)
Max. Current Consumption (mA)
Coil Resistance (ohms)
Coil Impedance (ohms)
Operating Temperature (C)
Storage Temperature (C)
Passive buzzer have not internal drive circuit inside, We used to
name them as acoustic. Passive work buzzer square wave signal.
Passive buzzer can't make a sound by direct current.
The disadvantages of EMAT:
1. Low transduction efficiency. EMAT transducers typically produce
raw signal of lower power than piezoelectric transducers. As a
result, more sophisticated signal processing techniques are needed
to isolate signal from noise.
2. Size constraints. Although there are EMAT transducers as small
as a penny, commonly used transducers are large in size.
Low-profile EMAT problems are still under research and development.
Due to the size constraints, EMAT phased array is also difficult to
be made from very small elements.
3Caution must be taken when handling magnets around steel products.