【正文】 (８ ) 驅(qū)動直流 驅(qū)動直流是指時基電路工作時為負(fù)載提供的輸出電流，也稱為負(fù)載電 流IL,根據(jù)時基電路的輸出狀態(tài)和負(fù)載的連接方式，驅(qū)動電流通常分為拉出電流與吸入電流兩種。兩種時基電路的定時精度為 1%。 由以上分析及圖（ b）可見， 555 電路的觸發(fā)和傳輸特性，其信號的上升特性和下降特性不重疊，而存在回差電壓Δ V，故這種觸發(fā)電路稱之為施密特電路。 LM7805有 5V、 6V、9V、 12V、 15V、 18V和 24V七種不同的固定輸出電壓，廣泛應(yīng)用于各種電子設(shè)備中。 變壓器原理很簡單顧名思義變壓器的主要作用就是變壓，也就是改變電壓。本電路由電源電路、信號輸入電路、觸發(fā)電路、驅(qū)動電路、光敏傳感器、集成電子開關(guān)電路組成。t start normally, achieve the purpose of saving energy. Still have a kind of situation, be if one day filled the sky dark clouds, the brightness of insufficient, so fluorescent lamp can be opened. But soon, the weather sunny, fluorescent lamp won39。 Burglar telephone alarm controller circuit design Summary ： With the continuous development of electronics, applied electronics is steadily moving toward a new era. Electronic technology, electronic design, electronic products, such as the everchanging update to the people39。t shut automatically. Also caused much waste. In daylighting point where can be installed outside the classroom when indoor daylighting points, a strength the difference value is narrowed to a certain range, we can think fluorescent lamp role can neglect, fluorescent lamp will automatically closed. Another option, if it is raining outside the classroom, classroom inside the sun lights on and at the window, make a lightning outside is very bright, fluorescent lamp had closed down, which can cause trouble. So to avoid this problem. Methods is in circuits installed counters, makes the brightness difference in maintaining a certain time just can make fluorescent lamp pulsory closed. To sum up, we can use light activated triode design a circuit, making the fluorescent lamp couldn39。 本設(shè)計中 ,詳細(xì)的介紹了防盜電話報警器的檢測部分的整個制作過 程 ,也按本設(shè)計內(nèi)容成功的做了實物。變壓器的原理是電磁感應(yīng)技術(shù) ,變壓器有兩個分別獨立的共用一個鐵芯的線圈。最大輸出電流為 。 回差電壓Δ V的大小為 Δ V=VB— VA ==32VDD?BBA RRP RRPR ? ?? — 31 VDD?BBA R RRPR ?? ==31VDD?)( ))(( BB BAB RRPR RRPRRPR ? ??? 改變 RP 和 RB的比值，可改變電路的回差電壓Δ V。 (４ ) 放電電流 555 電路作為定時器或多諧震蕩器使用時，常利用放電端給外接電容一個接地放電的通路。 555 時基電路的各管腳功能 一腳：電源負(fù)端 GND 二腳：低觸發(fā)器，簡稱觸發(fā)端 TR 非 三腳：輸出端 OUT，可以將繼電器線圈等負(fù)載與它相連，另一端與電源正極或負(fù)極相連，其最大輸出電流不小于 200MA 四腳：強(qiáng)制復(fù)位端 MR非，若不需強(qiáng)制復(fù)位，則可與電源正極相連或懸空 五腳：用來調(diào)節(jié)比較器的基準(zhǔn)電壓，簡稱控制端 Vc，若不需要調(diào)節(jié)基準(zhǔn)電壓，則可懸空或通過 F，電容器接地。 (７ ) 最高工作頻率 最高工作頻率是指 555 時基點電路連接成振蕩電路使用時，輸出脈沖的最高頻率。 (３ ) 定時精度 定時精度是指時基電路在用做定時器使用時的精確程度。 （ a）電路圖 （ b）施密特觸發(fā)特性 圖 8 設(shè)分壓電路中的電位器 RP 中 抽點輸入的信號為 Vin，調(diào)節(jié) RP會使輸入信號有一定的變化范圍，根據(jù) 555 的觸發(fā)復(fù)位和置位特性，其輸出端 Vo（ 3腳）會有如下變化： 當(dāng)輸入觸發(fā)信號 Vin 小于 VA（如圖 8b）時，設(shè) 2腳為電平低電平“ 0”， 6腳也為低電平“ 0”，則 555 處于置位狀態(tài)， 3腳輸出呈高電位“ 1”； 當(dāng) VAVinVB 時，即 2腳為低電平（ 1/3VDD）， 6腳仍為低電平（ 1/3VDD）時，3腳輸出仍呈高電位，此種狀態(tài)屬雙穩(wěn)態(tài)狀態(tài)； 當(dāng) Vin1/3VDD,且 VinVB（ 2/3VDD）時， 555 轉(zhuǎn)呈復(fù)位狀態(tài)，即 3 腳輸出為低電平“ 0”。③腳為接地端；②腳為穩(wěn)壓電壓 Uo輸出端。 C2進(jìn)一步濾除高頻干擾，供給電路工作，紅色發(fā)出二極管是電源指示燈， R1是發(fā)光二極管的限流電阻，發(fā)光二極管的正常工作電流為 10mA。本論文介紹了一款迷惑型防盜電話 控制器電路 ,如果你出門在外 ,只要你往家里打個電話 ,你家里的收錄機(jī)就會發(fā)出聲音 ,天黑時 ,室內(nèi)的電燈也會亮。t reliable direct drive dc relay, reason need to add level 1 transistor amplifier, so the driver output portion posed by the transistor and relays. This circuit relay models 4098, dc resistance to 300 Ω, drive current for 200 ma, reason transistor collector current should be more than 300 ma, set transistor current amplification coefficient for 50, the beta transistor turnon the base current for 300/50 = 6 (ma). Can be calculated resistance R10 = (6V V) / 6mA hundredth 9K Ω, so this circuit Ω R10 take 10 K, triode can be used for 9013, maximum output current 500 milliampere. 5 and photosensitive sensor This circuit 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. Light activated triode and ordinary triode similar, also have current amplification e ffect, but it is not just the collector current by passive circuit and current control, but also by ray radiation control. Usually base not derivation, but some light activated triode base have derivations, used for temperature pensation and additional control functions. When having photosensitive properties of PN junction by irradiation, formation, thus resulting in the light of photocurrent born by base into emitter current collector loop, in order to get an enlarged equivalent to beta times the signal current. Different material made of light activated triode have different spectral characteristics and pared with photosensitive diode, has the very big photocurrent amplification, namely high sensitivity. Through to the semiconductor diode and triode learning, I understand the transistor the basic structure and working principle of semiconductor, transistor, is one of the basic ponents, with current amplification effect, is the core of electronic circuit ponents. Transistor is in a semiconductor substrate production two are located very close of PN junction, the two PN junction is divided into three parts, block semiconductor middle part is basebed, two side part is the launch region and integrating electricity area, arrangement have PNP and two NPN transistors, as shown in figure drawn from three areas corresponding electrode, respectively base b emitter e and collector c. Launch region and basebed between PN junction that launch knot, bines electronic zone and basebed between PN junction called the collector. Basebed is very thin, and launch region thicker, impurity, PNP transistor concentration large type emission region fire is the direction of movement, the cavity with current direction, reason emitter to the arrow, NPN transistor launch region firing type is free electrons, which the movement direction and current in opposite directions, so emitter arrow outward. Emitter arrow outward. Emitter arrow in also PN junction in forward voltage under the conduction direction. Silicon transistor