最新數(shù)字頻率計設(shè)計與制作-wenkub
2023-07-15 02:39:30 本頁面
【正文】 signal was variety seasonal signal, such as sinusoidal wave, square wave, triangle wave and so on. If we using amplify circuit, we can also use sensing element measuring so many faint and regular signals,for example voice, inflexible vibrate and rotation rate. Digital Frequency Meter can make us intuitively sight the signal frequency, it’s conveniently, simply and accuracy,so it has enormously worthy in many fields, include puter, munication apparatus, automation equipment and so about this subject study, the Digital Frequency Meter Design and Fabrication,I select 555_timer produce a normal time signal, using Monostable Trigger 74LS273 constitute fliplatch, using counter flipflop 74LS90 count, using 74LS48 constitute a code translator and usig Mixie light reveal frequency. Apply digital integrated circuit chip help me save so many time and reduce a number of inconvenience.Key words: Digital Frequency Meter。使用頻率計能讓我們直觀的看到信號的頻率，其方便性、簡單性、準(zhǔn)確性使其具有較高的實用價值。數(shù)字頻率計設(shè)計與制作王峰, 電子工程系摘 要:數(shù)字頻率計是一種可以用十進(jìn)制數(shù)字顯示被測信號頻率的測量儀器。因此數(shù)字頻率計是一種應(yīng)用很廣泛的儀器，在計算機(jī)、通訊設(shè)備、自動化等科研生產(chǎn)領(lǐng)域起著重要作用。 flipflop。如果我們能在給定的1S時間內(nèi)對信號波形計數(shù)，并將計數(shù)結(jié)果顯示出來，就能讀取被測信號的頻率。2 設(shè)計思路按照圖2所示的邏輯圖所示。同時，鎖存器產(chǎn)生一個鎖存信號輸送到鎖存器的使能端將結(jié)果鎖存,并把鎖存結(jié)果輸送到譯碼器來控制數(shù)碼管，這樣就可以得到被測信號的數(shù)字顯示的頻率。因此，它是一種測量范圍較廣的通用型數(shù)字儀器。定時器的主要功能取決于比較器，比較器的輸出控制RS觸發(fā)器和放電三極管T的狀態(tài)。其引腳排列圖和功能表如下所示：圖5 74LS90引腳圖圖6 74LS90功能表 芯片74LS27374LS273是8位數(shù)據(jù)/地址鎖存器，他是
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