【正文】 ring Text Through this type of circuitry, it is possible to control a large SCR current with an extremely small input signal. 通過該類電路，非常小的輸入信號可控制大的 SCR電流。 Unijuncity Transistor Pulse Triggering Words and Terms photocell [`f?ut?sel] ，光電池 thermocouple [`θ?:] 偶，熱電偶 ceramic [si`r230。 Phase Control Text In an LR bination, inductance causes the current to lag behind the voltage by as much as 90176。 Directcurrent Regulation Text This in turn would cause more voltage drop across the series resistor, which would lower the output voltage. 相應(yīng)地，降落在串聯(lián)電阻上的電壓會增大，從而降低輸出電壓。 Directcurrent Regulation Words and Terms regulation [.regju`lei??n] n. 調(diào)節(jié)，調(diào)整 rated [`reitid] a. 額定的 zener diode [ `dai?ud] 穩(wěn)壓二極管 breakdown voltage 擊穿電壓 voltage regulation 電壓調(diào)節(jié)器 Directcurrent Regulation Words and Terms opposite [` ? p?zit] a. 相對的，相應(yīng)的，相反地 shunt [?Λnt] 、分流器 innovation [.in?`vei??n] ，革新 fixed [fikst] ，不變的 extra [`ekstr?] ，附加的 Directcurrent Regulation Words and Terms representative [.repri`zent?tiv] a. 典型的，代表的 shortcircuit protection 短路保護(hù) thermal [`θ?:m?l] ，由熱造成的 indestructible [.indis`trΛkt?bl] Directcurrent Regulation Text The concept of voltage regulation can be understood by refering to the formula 參照公式 ,可以最好地理解概念：電壓調(diào)整。 Filter Circuit Text The output of a rectifier has a dc value and ac ripple value as shown in Figure . 如圖 ，整流器的輸出包括直流成分和交流脈動成分 。kjur?si] ，精確度，精度 liquidcrystal [`likwid `kristl] n. 液晶 decoder [di:`k?ud?] n. 譯碼器 energize [`en?d?aiz] ，激勵(lì)，供以能量 grounding n. 接地 Digital System Decoding Words and Terms segment [`segm?nt] n. 段，部分，環(huán)節(jié) manual [`m230。 FlipFlops Text While this device may be called upon to count an endless number of objects, it essentially counts only one thing, electronic pulses. 盡管可以說該器件能對數(shù)不清的物體進(jìn)行計(jì)數(shù)，本質(zhì)上，它僅僅對一種物體進(jìn)行了計(jì)數(shù)，即電脈沖。 FlipFlops Text In this capacity, it can be made to hold an output state even when the input is pletely removed. It can also be made to change its output when an appropriate input signal occurs. 至于這方面，甚至當(dāng)輸入信號完全去除時(shí)它都能保持輸出狀態(tài)。該放大器有兩個(gè)分別標(biāo)為 V V2的輸入端。ηgl] differential amplifier 差動放大器 impedance[im`pi:d?ns] n. 阻抗 pushpull a. 推挽（式 )的 polarity [p?u`l230。可控硅整流器（ siliconcontrolled rectifier, SCR）就是最初開發(fā)出的三極管之一。d?Λη k??n]:單結(jié) emitter [i180。這意味著僅僅當(dāng)發(fā)射 基結(jié)處于正偏且有基極電流 IB時(shí)才會有其輸出或集電極電流 IC Bipolar Junction Transistor Text When the base current ceases, collector current stops and the transistor bee nonconductive. This condition is called cut off. 當(dāng)基極電流消失時(shí)，集電極電流停止，晶體管處于非導(dǎo)通狀態(tài)。 Bipolar Junction Transistor Text Two distinct kinds of semiconductor crystals are connected together by a mon element. 兩種截然不同的半導(dǎo)體晶體通過公共元件連接在一起。mit?]:發(fā)射極 collector[k?180。p?ul?]:有兩極的 , 雙極的 Polarity [p?u180。zist?]:[電子 ]晶體管 Bipolar [bai180。simb?l]:符號 , 記號 , 象征 emitter [i180。 Bipolar Junction Transistor Text Holes are positive current carriers, whereas electrons are negative current carriers. 空穴是正的載流子，電子是負(fù)的電流載流子。 Bipolar Junction Transistor Text A transistor is primarily classified as a currentoperating device. This means that the output or collector IC will occur only when the emitterbase is forward biased and producing base current. 晶體管被劃分為基本電流型器件。ju:ni180。 UJT Thyristors and SCRs Text A variety of unidirectional thyristors is now being used in industrial electronic applications. One of the first to be developed was the siliconcontrolled rectifier(SCR). The term thyristor was derived form the words thyratrontransistor. 工業(yè)電子應(yīng)用系統(tǒng)目前使用了很多種單向晶閘管。mp] triangle[`trai230。 Operational Amplifiers Text The first stage or input of an opamp is usually a differential amplifier. This amplifier has two inputs, which are labeled V1 and V2. 運(yùn)算放大器的輸入或者其第一級通常是一個(gè)差分放大器。 In addition to these operations, a flipflop may also be used as a memory device. 除此之外，它也可用作存儲器件。作為慣例，它可對許多不同數(shù)字應(yīng)用系統(tǒng)中的大量物體進(jìn)行計(jì)數(shù)。g`ik teip] interface [`int?feis] ，界面，連接處 sensitivity [.sensi`tivti] n. 靈敏度 Digital System Decoding Words and Terms accuracy[`230。 Circuits used removed ac vatiations of rectified direct cuurent are filter circuits. 去除整流后直流電流中交流脈動的電路就稱為濾波電路。 The effect of a heavier load on the filter capacitor is shown in Figure (D). 電容濾波器帶重負(fù)載的效果如圖 (D)所示。 Directcurrent Regulation Text An increase in output voltage would cause a corres ponding increase in the conduction of the seriespass transistor. 輸出電壓的增大會導(dǎo)致串聯(lián)三極管傳導(dǎo)的相應(yīng)增加。 These ponents are used to alter the current and voltage relationship of the circuit. 利用這些組件改變電路的電流與電壓之間的關(guān)系。 Phase Control Text The line length of a phasor is used to show its value, while its direction is used to show phase relationships. 相圖的線長代表了大小，方向代表了其相位關(guān)系。 Unijuncity Transistor Pulse Triggering Text The output of photocells, thermocouples, and other transducers can be used to energize the input of a UJT, which in turn will trigger the conduction of an SCR. 光電管、熱電偶以及其它變換器的輸出可激活 UJT的輸入，相應(yīng)地觸發(fā) SCR，讓其處于導(dǎo)通狀態(tài)。 Introduction to Control System Words and Terms dynamic [dai`n230。 Introduction to Control System Text During the dynamic and highly motivated 20th cen tury, the controlsystem engineering has transformed many of our hopes and dreams into reality. 在快速發(fā)展的 20世紀(jì)，控制系統(tǒng)業(yè)界已經(jīng)把我們許多希望和夢想變?yōu)楝F(xiàn)實(shí)。 Introduction to Control System Text In addition, Control systems exist that require no human intercation, such as aircraft automatic plots and auomobile cruise control systems. 另外，有些控制系統(tǒng)不需要人的參與，如飛行器的自動駕駛與汽車的巡航控制系統(tǒng)。n`tisipeit] （討論，處理，提出 ） stability [st?`biliti] n. 穩(wěn)定性 ramp [r230。 The same two categories are traditionally used for the performance specfications of feedback systems. 習(xí)慣上將這兩類用于反饋系統(tǒng)的性能指標(biāo)。g`ik