The device is fabricated according to the principle of lC×UC for high-power triode working heat. As shown in the figure below, the high power transistor 3DD15 is a heating element, the resistors R2, R3, R4, and R5 are used for temperature control, the LED D1 is used for power supply indication, and D2 is used for predetermined temperature illumination indication. The NTC negative temperature coefficient thermistor R3 is mounted on the surface of the 3DD15 metal case to monitor temperature changes. The 3DD15 metal casing surface is also fixed with an aluminum tube with a diameter of 1cm and a length of 5cm for placing the temperature sensor probe to be tested. After the work, the resistance value of R3 gradually decreases with the increase of temperature, and the pressure difference between a and b increases gradually. When the D2 conduction voltage is reached, the illumination indicates that the set temperature has reached (about Smin), and the temperature sensor can be verified. At this time, the surface of the 3DD15 metal casing is about 70 °C. When the power is just working, the current is about 3A. As the temperature rises, the voltage at point b increases, and the conduction degree of Tl and T2 decreases. Then the current decreases. When the temperature reaches 80C, the temperature does not rise and is maintained. At this time, the current is about 1.5A. . The advantage of this device is that it does not need to be connected to the power supply on the spot. Instead, it is powered by the miner's own battery (7Ah/4.2V), which can be removed by screwing off the miner's lamp, which is convenient and explosion-proof.
Ethernet cables connect devices such as PCs, routers, and switches within a local area network.Most technicians refer to these standards as CAT5 and CAT6, respectively. Also CAT3 available. Because of this, many online stores that sell network cables use this abbreviated language as well.
The connector can by shield or non-shield type, raw cable can be UTP, STP, FTP type. Also the molded shape can be custom mould by straight, right-angle, 105 degree, etc.
These physical cables are limited by length and durability. If a network cable is too long or of poor quality, it won't carry a good network signal. These limits are one reason there are different types of Ethernet cables that are optimized to perform certain tasks in specific situations.
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