HYA53 / HYAT53 rat bite/buried HYAT53 directly buried cables: mainly used for the transmission of audio, 15 duct | communication cable | (pipe/overhead) HYAC (overhead) HYAT (waterproof) 0 KHZ and analog signals and 2048 kbit/s and under the following digital signal. Under certain conditions, it can also be used to transmit digital signals over 2048kbit/s. Suitable for overhead or pipeline laying in city, suburb and local area, or directly buried.
WDZ-KYDYD铜芯无卤低烟阻燃聚烃绝缘聚氯乙烯护套控制电缆。
WDZ-KYDYDR铜芯无卤低烟阻燃聚烃绝缘聚氯乙烯护套控制软电缆。
WDZ-KYDYDP铜芯无卤低烟阻燃聚烃绝缘聚氯乙烯护套铜线编织屏蔽控制电缆。
⑥跑道中线灯。
以15或30m的间距装在跑道中线上，发出白色光线（接近跑道末端的为红色），标志跑道中线。
⑦接地带灯。
对称地装在跑道着陆端900m长的跑道道面内,共180个,发出白光,标志可以降落着地的地带。
弱电信号线|线|铠装线；电信局专用线；通信电缆-HYA电缆|HYA23电缆|HYA22电缆|HYA53电缆|室外线HYA53HYA53钢塑复合带铠装通信电缆;HYA|地面通信电缆|地面通信线缆,直埋市话线.AVVR型300/300V铜芯聚氯乙烯绝AVVR聚氯乙烯软护套线缘聚氯乙烯护套。
本安电缆具有低电容和低电感，并具有极好的屏蔽性能和抗干扰性能，防爆性能优于一般计算机电缆和控制电缆。
它适用于有防爆要求场合的集散系统和自动化检测控制系统等电路中作微弱信号的传输用线。
品名：集散型DCS本安电缆、本安屏蔽控制电缆、本安DCS防爆电缆、本安信号控制电缆、本安交联电缆、本安DCS屏蔽电缆、本安耐火电缆、本安铠装电缆、本安控制电缆、本安阻燃电线电缆。
NPN三极管和输出NPN型三极管，要导通，需要满足VCVBVE，其中VC，VB，VE分别是集电极，基极和发射极的电压，一般使用NPN三极管做输出的时候，往往把三极管接成OC输出，也就是让集电极C开路的输出，而射极E接地，基极B是控制信号控制输入端。
上图是一张NPN输出的示意图，左边是传感器内部结构，已经加了上拉电阻R2了，当IO处输入高电平，三极管导通，OUT处的电位几乎和地端一样，OUT输出低电平。
Flame retardant cables and fireproof cables: the difference between the average person is very easy to confuse the concept of flame retardant cables and fireproof cables, although there are many more flame retardant cable applies to the advantages of chemical enterprise, such as low, low smoke, non-halogen, but in general, fire-resistant cable can replace flame retardant cable, and flame retardant cables can't take place of fire-resistant cable.
矿用控制电缆电气性能：1、额定电压450/750v2、电缆导体的长度允许工作温度为70摄氏度3、电缆的敷设温度应不低于0摄氏度，推荐的允许弯曲半径；4、无铠装层的电缆，应不小于电缆外径的6倍5、有铠装或铜带屏蔽结构的电缆，应不小于电缆外径的12倍。
ZR-VV42ZR-VLV42聚氯乙烯绝缘粗钢丝铠装聚氯乙烯 敷设在竖井，水下等垂 护套阻燃电力电缆 直场合，能承受相当的 。
DJYVP 聚乙烯绝缘对绞铜线编织总屏蔽聚氯乙烯护套计算机电缆 敷设室内、电缆沟、管道等要求静电屏蔽场合。
DJYPVP 聚乙烯绝缘对绞铜线编织分屏蔽及总屏蔽聚氯乙烯护套计算机电缆 敷设室内、电缆沟、管道等要求静电屏蔽场合。
HJVV, HJVVP, HPVV communication cable: mainly used for transmitting audio, 150kHZ and below analog signals 2048kbit/s and below digital signals. Under certain conditions, it can also be used to transmit digital signals over 2048kbit/s. Used for short distance signal transmission. WeChat sales department is newly added in our factory. WeChat ID: is not convenient for WeChat contact! HJVV, HJVVP, HPVV communication cable is introduced: used for distribution frame or switch to switch internal connection between the machine at all levels (including rural telephone bureau), such as the beginning of the line and terminal for connection to local telephone cable to the junction box or distribution frame, inner conductor wire diameter (mm) : 0.40, 0.50, 0.60, 0.70, 0.80, 0.90, logarithmic (on) : 5-1000 HPVVuency communication wiring cable wiring cable HPVV ZR - HPVV broadband/product use: It is applicable to the transmission system from the remote optical network unit to the user and the subsystem of the transmission between buildings in the building wiring system. The highest transmission fre are 30MHz and 100MHz respectively.
Frequency converter cable symmetry design a: special cable for 1.8/3 kv and below frequency conversion motor, and symmetric 3 + 1 core and 4 core cable can only be used for the main power input cable, but it is best to use the symmetric structure of cable. Inverter and variable frequency motor and cable must adopt symmetrical cable structure, symmetrical cable structure with three core and 3 + 3 core two kinds, 3 + 3 core cable structure is a small four to three core insulation wire core in the fourth core (neutral) is decomposed into three smaller insulation wire core section, the three big three symmetrical string cable core cable, special cable for 6/10 kv frequency conversion motor, the cable structure and 6/10 kv power cable, ordinary ordinary power cable is three insulation wire core adopts copper tape screened after cabling.
蜂鸣器的压降很难获知，有些蜂鸣器的压降可能变动，这样一来基极电阻阻值就很难选择，阻值选择太大就会驱动失败，选择太小，损耗又变大。
d电路也会出现同样的问题，不建议选用图二的这两种电路。
图三这两个电路，电路的驱动信号为3.3VTTL电平，常出现在3.3V的MCU电路设计中，如果不注意就很容易就设计出这两种电路，而这两种电路都是错误的。
先分析e电路，这是典型的“发射极正偏，集电极反偏”的放大电路，或者叫射极输出器。
ZR-BPYJVP3交联聚乙烯绝缘聚氯乙烯护套铝聚酯复合膜绕包屏蔽变频电力电缆。
1、产品执行标准：MT2、用途：本产品适用于交流额定电压u0/u为450/750V及以下的控制监控回路及保护线路和配电装置中电器仪表的连接线。
接地引出线要求采用我镀锡编织铜线，和电缆铜带连接时应用铬铁锡焊，不宜用喷灯封焊，以免烧损绝缘。
③三相铜带屏蔽应分别与地线相连，注意屏蔽接地线和钢铠接地线应分别引出，相互绝缘，焊接地线的位置应尽量靠下。
对电缆端头和中间接头的基本要求：a.导体连接好；b.绝缘可靠，推荐采用辐照交联热收缩型硅橡胶绝缘材料；c.密封良好；d.足够的机械强度，能适应各种运行条件。
Rated voltage U0 / U for 450/750 v, conductor wire core long-term working temperature is 70 ℃, 95 ℃, the cable laying temperature below 0 ℃.
电缆的型号：ZR-YJVZR-YJLVZR-YJYZR-YJLYZR-YJV22ZR-YJLV22ZR-YJV23ZR-YJLV23ZR-YJV23ZR-YJLV23ZR-YJV33ZR-YJLV32ZR-YJLV33适用范围：本产品适用于工频额定电压3.6/kV-26/3。