外文翻譯----led顯示屏的數(shù)字電壓表-預(yù)覽頁
【正文】 信號轉(zhuǎn)換為數(shù)字，可以直接驅(qū)動4 個(gè) 7 段 LED 顯示。 (2) 電源要求： .............200mA（最大） 。 簡易建筑。 很少的外部元件 。 無需要一個(gè)采樣保持電路 。這種類型的轉(zhuǎn)換器通常優(yōu)于其他類型，因?yàn)樗峁┝藴?zhǔn)確，簡潔的設(shè)計(jì)和它可以將相對不重要的噪音變得非?？煽?。第二個(gè)階段就是所謂的負(fù)斜率時(shí)期，其持續(xù)時(shí)間由第一階段積分器輸出而定。為了進(jìn)行測量，需要將電壓施加于電路的 1 和 2 點(diǎn)，最后通過電路的 R3， R4 和 C4 應(yīng)用到集成電路的引腳 30 和 31。連接集成電路引腳 33 和 34 之間的電容已被選定，以彌補(bǔ)由內(nèi)部參考電壓帶來的誤差，并保持穩(wěn)定的顯示。電阻 R6 的控制電流允許流經(jīng)顯示，以便使電路在沒有損壞的前提下顯示充分的亮度。 背面 4 數(shù)字電壓表印刷電路板的加工 首先讓我們考慮建立一個(gè)印刷電路板上的電子電路的基 礎(chǔ)知識。 焊接的部件，印刷電路板是建立你的電路 的 唯一的方式和 你在做板時(shí) 很大程度上取決 了 你的成功或失敗。為此 我們特地準(zhǔn)備了一特制 海綿 并使其 保持潮濕，這樣 可以不時(shí)擦拭 熱 烙鐵 尖 ， 從而去除 積累 在 它 上面 的殘?jiān)?。太多的流量可能會?dǎo)致許多問題， 也 是電路故障的主要原因之一。 你有時(shí)可能會發(fā)現(xiàn)比起平常還會有重計(jì)部分，它將過于厚而不能進(jìn)入個(gè)人電腦印刷電路板的孔。烙鐵頭必須觸及略高于印刷電路板 的地方。如果一切處理得當(dāng)則表面聯(lián)合處有一個(gè)光明的金屬質(zhì)感，其邊緣應(yīng)該是平滑的并且有一軌道面。 確保 你 不使用 過 多的焊料是必需的， 因?yàn)槟?正在 冒著 毗鄰軌道 短路的風(fēng)險(xiǎn) ，特別是如果他們都非常接近 時(shí) 。它有鋁箔包裹以防止靜電放電，并應(yīng)小心處理，以免損壞它。短路輸入（ 0V）和調(diào)整微調(diào)小屏幕顯示，直到完全去掉 0。 確保供應(yīng)具有正確的電壓，以正確的方式連接到你的電路上 。 IN LOW respectively). The resistor R1 together with C1 are used to set the frequency of the internal oscillator (clock) which is set at about 48 Hz. At this clock rate there are about three different readings per second. The capacitor C2 which is connected between pins 33 and 34 of the IC has been selected to pensate for the error caused by the internal reference voltage and also keeps the display steady. The capacitor C3 and the resistor R5 are together the circuit that does the integration of the input voltage and at the same time prevent any division of the input voltage making the circuit faster and more reliable as the possibility of error is greatly reduced. The capacitor C5 forces the instrument to display zero when there is no voltage at its input. The resistor R2 together with P1 are used to adjust the instrument during setup so that it displays zero when the input is zero. The resistor R6 controls the current that is allowed to flow through the displays so that there is sufficient brightness with out damaging them. The IC as we have already mentioned above is capable to drive four mon anode LED displays. The three rightmost displays are connected so that they can display all the numbers from 0 to 9 while the first from the left can only display the number 1 and when the voltage is negative the 171。. Parts List R1 = 180k P1 = 20k trimmer multi turn R2 = 22k U1 = ICL 7107 R3 = 12k LD1,2,3,4 = MAN 6960 mon anode led displays R4 = 1M R5 = 470k R6 = 560 Ohm C1 = 100pF C2, C6, C7 = 100nF C3 = 47nF C4 = 10nF C5 = 220nF If it does not work Check your work for possible dry joints, bridges across adjacent tracks or soldering flux residues that usually cause problems. Check again all the external connections to and from the circuit to see if there is a mistake there. See that there are no ponents missing or inserted in the wrong places. Make sure that all the polarised ponents have been soldered the right way round. Make sure the supply has the correct voltage and is connected the right way round to your circuit. Check your project for faulty or damaged ponents. Sample Power supply 1 Sample Power Supply 2
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