1, imported normally open type dry reed pipe
2, the comparator output, signal clean, good waveform, driving ability is strong, for more than 15 ma.
3, the working voltage of 3.3 V to 5 V
4, output form: digital switch output (0 and 1)
5, equipped with fixed bolt hole, convenient installation
6, small board PCB size: 3.2 cm x 1.4 cm
7, use the LM393 wide voltage comparator
The characteristics of the dry reed pipe:
Dry reed pipe is short for dry reed pipe, there is a contact of passive electronic switch components, it has a simple structure, the advantages of small size is easy to control, its shell is commonly a sealed glass tube, tube is equipped with two elastic reeds iron panels, poured has called a rhodium metal inert gas. At ordinary times, two of the glass tube made of special materials reeds are separated. When magnetic material near the glass tube, under the action of magnetic field lines, two reed pipe is magnetized and attract each other contact, reed will suck together, make the circuit connected nodes receive. Magnetic disappeared, two reeds due to the elasticity of itself apart, the line is disconnected. Therefore, as a signal of the magnetic fields to control the circuit switching device, with a dry reed pipe can be used as a sensor, is used to count, spacing and so on, in the security system is mainly used in the production of door magnetic, magnetic window), but also widely used in all kinds of communication equipment. In practice, usually with a permanent magnet control this two pieces of metal on it or not, so also known as “magnetron.