【正文】 s. Photo transistor is a kind of important derivatives. Human body is the most important visual sense, therefore, I think through light to control circuit is really too subtle, and photosensitive diodes triode just can finish this task. Because light activated triode due to still have amplification, therefore application than diode more extensive. Light activated triode is used for measuring brightness, often with light emitting diode is used together as a signal receiving devices. Use examples below introduce various functions. (1) measurement brightness In the classroom library, and many times, fluorescent lamp daytime also on, in the dormitory inside, fluorescent lamp is often rest day and night, the students on this waste has insensitive. Some classmates in the morning to go to the classroom, although the classroom very bright but also open lamp, although a daylight lamps will not waste much resources, but many a little makes a mickle, waste is a lot. Therefore, we can be in the classroom install a control circuit, when brightness to a certain extent, making the classroom inside and inside the dormitory fluorescent lamp will fail to start. We can use light activated triode additional electromagic relays to plete the circuit. Daylighting point selection is a key, because not every classroom bright degree is the same, we can use multipoint sampling to meet this requirement. For example in 20 classroom are placed light activated triode, we can set, if they all or most of their brightness is very high, so, fluorescent lamp can39。 Trigger circuit adopts NE555 timebased circuit as schmidt trigger circuit, triggering high sensitivity and good reliability, Photosensitive sensor adopts light activated triode 3DU31, it is one of the most mon photodetector, its sensitive wavelengths in the visible wavelength near infrared wavelength and ultraviolet ray, including wavelength, Integrated electronic switch circuit adopts TWH8778 type power switching integrated circuit, it USES TO 220 five feet plastic packaging, TWH8778 internal no overvoltage, overheating, overcurrent protection circuit, such as TWH8778 28V / 1A below in doing highspeed switching. When the telephone in hang condition, telephone lines L1, L2 between 40 ~ 60V of dc voltage, due to the capacitance C1, C2 role, not by integrated circuit IC1 triggered such ponents delay circuit. When people call scoring es, L1, L2 ing signal submitted variable state, ringing the capacitance C! C2 coupling, diodes, VD1, VD2 times pressure rectification, electricity Let the C3 filtered into a positive dc voltage up to triode V, resulting in the base of saturated conductivity, right now V IC1 (2) Feet by high level into a low level, triggering IC1 buy bits, the output (3) feet by low level into high level, electromagic relays K1 to electric suction close, its normallyon electrocuted K1 connected, leading to insert in the radio or power socket CZ recorder playback, can In broadcasting radio broadcast programs or tape content. If the dark, light activated triode V2 is high resistance, through integrated circuits IC2 role, electromagic relays K2 suction close, its often open contacts K2 also connect, lights L bright. After IC1 triggered, electricity The resistance to source capacitance C5 charging, R2 when C5 on both ends of the voltage up to 2/3 power supply voltage, IC1 will reset, Its fanout (3) feet again into a low level, tape recorder and lights and close. When people call again scored will be repeated The above process. Five, the ponent list 名稱 型號 數(shù)量 名稱 型號 數(shù)量 電阻 10K 2 芯片 NE555 1 10M 1 TWH8778 1 可調(diào)電阻 220K 1 二極管 1N4004 2 電容 47n 2 1N4001 2 4μ7 1 三極管 9013 1 10n 2 光敏三極管 3DU31 1 470μ 2 變壓器 220V/9V 1 插座 1 繼電器 JRX13F 2 開光 SB 2 燈泡 L 1 Six, assembly debugging 1. The use of main equipment and tools: DianLaoTie, multimeter, millivolt table, oscilloscope, signal generator, circuit boards, all kinds of a set of tools and ponents number (see ponent list). 2. Assembly and debugging method: In the production process, must pay attention to many details, elements arrangement and welding process is very important. In MHD process, I pay special attention to sensors, in body microphones and control device of arranged, in the design of the circuit photoconductive resistance this sensors must row in the edge, can not discharge in some lightemitting device around while not in photoconductive resistance line around some will stop the ray devices, should let photoconductive resistance photosensitive range maximal. As for some other control devices (such as switch) could also be fitted in the suitable for operation, and orientation to conspicuous. As for welding technology, this is the usual fundamentals. Welding process is good or bad, directly related to the design of finished product quality, it must be strictly required. In order to ensure products by vibration or impact was not fall off, bee loose, request solder should have good mechanical strength, In order to ensure good conductivity, request solder without welding, and welding deficiency is dependable, In order to ensure that the shape of solder joint surface is smooth, clean, no burr, the requirement with good solder rosin and soldering pen. In the welding process must control elements of welding time, avoid by heating time is too long and burnedout ponents. And welding connection do not have too much solder, avoid to cause a shortcircuit. The ponent ZhuangHan order is resistor, capacitor, diode, audion, integrated circuit, highpower tube, other ponents is first small after big. In order to debug, in the installation process the whole circuit I press unit circuit posed, one step one step of welding, general speaking first first welding power circuit of and ensuring it39。本論文介紹了一款迷惑型防盜電