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………………………………………………………………………… ..6 差動放大電路 ………………… ………………………………………………………………… .6 所用芯片 LM324………………………………………………………………………………… .7 5. A/D 轉(zhuǎn)換模塊 ……………………………………………………………………………………… 7 ICL7107 簡介 ………………………………………… ...………………… .…………………… ..8 A/D 轉(zhuǎn)換原理圖 …………………………… …………………………………………………… ..9 ICL7107 芯片的正常與否測試 …………………………… .…………………………………… .9 6. 數(shù)碼顯示模塊 ……………………………………………………………………………… ..… ..11 直插式七段顯示譯碼管簡介 ………………………………………………………………… ..11 ………………………………………………………………………………………… ..12 ………………………… .……………………………………… ...………… ..12 附圖 1 完整電路原理圖 ………………………………………………………… ………… .…… .14 附圖 2 PCB 布線圖 頂層 ………………………………………………… ………… .…… ...… .15 附圖 3 PCB 布線圖 底層 …………………………………………………… …… .…………… 16 3 基于應(yīng)變式傳感器的電子稱設(shè)計 社會不斷發(fā)展,技術(shù)不斷提高,家電設(shè)備日新月異,但初高中實驗室的設(shè)備卻依然是那樣陳舊,最明顯的當(dāng)是稱重設(shè)備, 依然是天平,天平構(gòu)造和制作簡單,但讀數(shù)容易出現(xiàn)誤差,且容易損壞和老化,調(diào)節(jié) 平衡時過于麻煩,浪費時間,而數(shù)顯電子稱則很好地避免了這些不足,放上物體即可讀數(shù),準確而快速, 方便實用,易于攜帶,不受場所制約。 未來的世界是輕松的世界,想想就是,連稱重都如此簡單了、。 電阻應(yīng)變式傳感器是傳感器中應(yīng)用最多 的一種 ,廣泛應(yīng)用于電子秤以及各種新型結(jié)構(gòu)的測量裝置。通過應(yīng)變計在構(gòu)件上 的不同粘貼方式及電路的不同聯(lián)接,即 可測得重力、變形、扭矩等機械參數(shù) 。物體的重量不同,電橋不平衡程度不同,指針式電表指示的數(shù)值也不同。它的內(nèi)部包含四 組形式完全相同的運算放大器,除電源共用外,四 組運放相互獨立。 ICL7107 將通用性、高精度和低成本真正的結(jié)合在一起,又低于 10?? 的自動校零功能,零漂小于 1?? /度。 ⑧ 芯片本身功耗小于 15mw(不包括 LED)。 ( 2) 注意芯片 27,28,29 引腳的元件數(shù)值,它們是 ,47K, 阻容網(wǎng)絡(luò),這三個元件屬于芯片工作的積分網(wǎng)絡(luò),不能使用磁片電容。這個電壓,最好是在 - 到 - 之間。其中最常見的是 φ5型 LED 產(chǎn)物 ,這里就選用這種規(guī)格大小布線。這個是通過課程設(shè)計又一次見證的無可爭議的事實,一個人的力量有限,你沒有的他有,互相轉(zhuǎn)達就都有了,就是那個話,你一個思想,我一個思想,互換一下你我都有兩個思想。s 150th anniversary celebrations and will attend City39?;蛟S是愧疚 于自己似乎把轉(zhuǎn)瞬即逝的很多個不同的日子過成了同一天的樣子;或許是追溯過去,對自己那些近乎偏執(zhí)的怪異信念的醒悟,這些天以來,思緒一直很凌亂,在腦海中不斷糾纏。t remember his appearance. 童年時,覺得壓歲錢和新衣服是過年必備,但是隨著年齡的推進,會越來越發(fā)現(xiàn),那些東西 根本就可有可無;初中時,以為要有一場暗戀才意味著真正的成長,但三年過去后,自己心平氣和的寫同學(xué)錄的時候,突然就發(fā)現(xiàn)是不是真正的成長了,好像并沒有那么重要了;然后到了高中,覺得非要吐露出自己的心聲才能為高中生涯里的懵懂情愫劃上一個句點,但畢業(yè)晚會的時候最終還是被梗塞在了咽喉,后來再次站在他曾經(jīng)揮汗如雨的球場,看著他投過籃球的球框時,突然間發(fā)現(xiàn)自己已經(jīng)想不起他的容顏。 At the moment, the sky is dark, the air is fresh factor after just rained. Suddenly thought of blue plaid shirt。s not needed. Instead, he plans to deploy his 270squarefoot (25squaremeter) main chute at an altitude of around 5,000 feet (1,524 meters). In order to deploy this chute successfully, he will have to slow to 172 mph (277 kph). He will have a reserve parachute that will open automatically if he loses consciousness at mach speeds. Even if everything goes as planned, it won39。t start planning... Those years, those days of do, finally, like youth, will end in our life. 此刻,天空是陰暗的,空氣里有著剛下過雨之后的清新因子。想要的,不想要的,界限明確,好像沒有什么可以撼動自己。 Junior high school, thought to have a crush on just means that the real growth, but over the past three years later, his writing of alumni in peace, suddenly found that isn39。s governing body, has also ordered an immediate investigation into the referee39。t appealed against the disciplinary action your employer has taken against you. However, if you win your case, the tribunal may reduce any pensation awarded to you as a result of your failure to appeal. Remember that in most cases you must make an application to an employment tribunal within three months of the date when the event you are plaining about happened. If your application is received after this time limit, the tribunal will not usually accept i. If you are worried about how the time limits apply to you, take advice from one of the anisations listed under Further help. Employment tribunals are less formal than some other courts, but it is still a legal process and you will need to give evidence under an oath or affirmation. Most people find making a claim to an employment tribunal challenging. If you are thinking about making a claim to an employment tribunal, you should get help straight away from one of the anisations listed under Further help. I