LED系列電阻計算器

道法自然

原文:
Use the calculator below to determine the series resistor needed to connect various series combinations of light emitting diodes or "LEDs". LED voltages vary from about 1.6 to 4.5 with 2 volts being a close approximation for red and orange LEDs. Blue and white LEDs will require higher voltages with blue being about 3.5 volts and white about 4.5 volts. To find the series resistor needed, enter the total number of LEDs, the individual LED voltage (1.6 to 4.5), the desired current (normally 10 to 20 mA) and the total supply voltage (3,6,9,12, etc.) Press "find resistance" to find the resistor value needed. Use a resistor rated higher than the displayed power in the box below "Series Resistor", most cases can use a 1/4 watt resistor. Several common LED connections are shown in the drawing below the calculator. For example, the fourth illustration down shows 4 LEDs connected to a 12 volt source which requires a 270 ohm resistor. The examples assume a LED voltage of 2 volts and a current of 15 mA. For more detailed LED information visit Don Klipstein's Web Site! and also The LED Museum for photos, charts, and information on a large library of discrete LEDs.
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翻譯成中文如下:
使用下面的計算器確定連接發光二極管或“LED”的各種串聯組合所需的串聯電阻。LED電壓在1.6到4.5之間變化，2伏對於紅色和橙色LED非常接近。
藍色和白色LED將需要更高的電壓，藍色約為3.5伏，白色約為4.5伏。

要找到所需的串聯電阻，請輸入LED的總數，單個LED電壓（1.6至4.5），所需電流（通常為10至20 mA）和總電源電壓（3,6,9,12等）。 ）
按下“查找電阻”查找所需的電阻值。使用額定值高於“串聯電阻”下面的顯示功率的電阻，大多數情況下可以使用1/4瓦電阻。計算器下面的圖中顯示了幾個常見的LED連接。

例如，第四個插圖顯示了4個LED連接到一個需要270歐姆電阻的12伏電源。這些例子假定LED電壓為2伏，電流為15毫安。有關更詳細的LED信息訪問 Don Klipstein的網站！
還有LED博物館的照片，圖表和關於分立LED大型圖書館的信息。
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http://www.bowdenshobbycircuits.info/led.htm
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電阻計算器
Graphical Resistor Calculator
This JavaScript-based web app comes from my JavaScript Bible books (dating back to the very first edition with a few upgrades a long time ago). Although I have removed other book examples from this web site, this page remains the most popular destination within dannyg.com — presumably as a resource for students of electricity/electronics and my fellow radio geeks. Enjoy!


http://www.dannyg.com/examples/res2/resistor.htm
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4頻帶電阻計算器
電阻器可能是電路中使用的最常見的構件。電阻器有多種形狀和尺寸。該工具用於解碼彩色帶狀軸向引線電阻的信息。


https://www.eeweb.com/tools/4-band-resistor-calculator
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電阻顏色代碼解釋器
要從色帶標記中確定電阻的值，請按住電阻，使金色或銀色帶位於右側。
如果只有3個波段，請按住電阻，使3種顏色最接近左端。接下來，點擊右邊4列中每一列的一種顏色，以使上面的電阻圖像與電阻標記一致。
前兩種顏色代表兩個數字，每個數字均為0-9。第三種顏色表示要添加的零的數量，第四種或右側的顏色表示容差。

由於紫色更接近光譜的高端，所以顏色值對應於紫色具有高於（7）的值而不是紅色（2）的彩虹的顏色。黑色最低值為0，白色最高值為9。
下面的計算器可以用來確定串聯或併聯的兩個電阻的等效值。輸入R1和R2的值，然後按下“=”按鈕。
標準5％值顯示在括號中，標準1％值顯示在下面的框中。向下滾動頁面以獲得標準5％值的列表。

http://www.bowdenshobbycircuits.info/resistor.htm

jcy567

真是太棒了好棒棒有機會多學一點

fsok2004

很方便的計算方式