Resistor color coder is a free desktop application that has been downloaded by hundreds of thousands of electronics enthusiasts. This tool is used to decode information for color banded axial lead resistors. It is too difficult to find the exact value of resistors that you have calculated for. All are shown in the same screen in order to make direct comparisons on values. Led resistor calculator led series resistor calculator. This calculator will help you determine the value of the resistor to add in series with the led to limit the current. Online calculator for finding a combination of resistors for a custom value.
The second calculator gives a more accurate value using these figures, which can be found in the suppliers catalogue. The last two bands that are on 4 and 5 colored resistors are multiplier and tolerance. Resistor calculator compute the best resistors combination to. Standard resistor closest value calculator electrical technology. Generally, resistors come in standard values such as e6, e12, e24, e48, e96. Type the resistance in the box below and select the units and optionally the tolerance from the dropdown boxes. This may lead to values like 149 ohms or 255,334 ohms. Selecting resistor parallel or series to obtain a given value, by in3otd. Resistor color code calculator the calculator above will display the value, the tolerance and performs a simple check to verify if the calculated resistance matches one of the eia standard values. This is where the resistor ratio calculator comes in handy. Using only resistors in the e12, e6, e3 and e1 ranges of resistors, the calculator will find a pair of resistors which can be used to create a resistance which is the closest match to that required, and will also report any better match which can be obtained.
These values are among the most common resistor values. Just input the indicated values and press the calculate button. Resistors can be found in almost all electrical circuits. To help you and myself find the best matching resistor, i created a interactive table of the defined eseries values. Resistors e6 20%, resistors e12 10%, and resistors e24 5%. Use the resistor calculator to determine which combinations of resistors from the. Enter known values then click on the appropriate calculate button. Led series resistor calculator digikey electronics. If the resistor is 4 colored, leave the 3rd band and temperature coefficient empty. The script works with a maximum number of unique resistors, depending on the number of resistor groups. This calculator quickly determines 4 or 5 band resistor values and tolerances. There are four more or less commonly used resistor series, with 12, 24, 48, and 96 values per decade, respectively. This calculator will select the closest standard resistor value, from 1% 5% or 10% standard eia values, calculates the error, and prints out a table of the standard values for the given tolerance.
It is too difficult to find the exact value of resistors that you have calculated for making electronics project and circuits etc as here is an example of such situation that how to calculate the value of resistor for different leds circuits or how to calculate the exact value of burnt resistor and find the standard value of smd resistors. Rescalc a freeware seriesparallel resistor calculator. The eia e number is the number of logarithmic steps. Opendro is an open source project to develop embedded software that runs on digital readouts dros for lathes, mills, and other machine tools. Quantization errors in resistor values are inherent to javascript. Following this logic, the preferred values for 10% tolerance resistors between 100 and 1,000 ohms would be 100, 120, 150, 180, 220, 270, 330 and so on rounded appropriately. Note that the e6,e12,and e24 series contain several values, shaded red in the table below, that do not follow the above equation. The calculator program runs on your own computer, so the time it takes to. Just add the number of resistors in the first column, and then enter the values of each resistor with selecting the proper unit in. Resistor calculator has an automatic program update. Led series resistance refers to the usage of resisters to stabilize the led current. This calculator will select the closest standard resistor value, from 1% 5% or 10% standard eia values, calculates the error, and prints out a table of the standard. Chart resistor bands calculation by color code input colour online table resistor calculation computation e12 e24 band eberhard sengpiel sengpielaudio.
Using resistor calculator, you select the colors for your color rings and the program just calculate the value of the resistor. If this option is selected then values of e24 not present in the selected series will also be used. The cost of running this website is covered by advertisements. It is called the e12 series because there are 12 values, spaced exponentially across a change in value of a power of ten.
This led resistor calculator calculates the value of the resistor which you would need in order to produce the desired current to go through the led. The third calculator will find a resistor value to place in parallel with a given resistor. The calculator is capable of finding suitable standard e12 10% resistor value and power for one led designs. Select preferred series optional e12 e24 e48 e96 e192. Download ni multisim 12 and ultiboard 12 free 30 day. If you use two resistor in series it is quite easy to figure out which values give the best match. To read the six strip colors codes on a resistor, the first, second and third strip color codes shows the first. Download resistor calculator for leds serial and parallel 2.
Select the resistor type 4 or 5 bands using the radio buttons. Resistor color code calculator 3, 4 and 5 band resistors hobby hour. When you select a resistor for this purpose, choose a device with a power rating between 2 and 10 times the value calculated below in order to avoid excessive. The most commonly used eseries is undoubtedly the e12 series. I mention this only because some folks might not know its there, as all the title says is its a voltage divider program. In this software, you have 8 color codes for tolerance level, which include brown, red, green, blue, violet, silver, gold, and grey. Leds are generally made with the builtin series resistors, which is one of the easiest way to limit and control the flow of the power. You can use our resistor calculator this table will be visible there as well to determine the value of a resistor or the needed color code for a give value.
The app is useful for every maker, engineer, student and arduino or raspberry pi tinkerer when working with electronics. A resistor is a passive electrical component that creates electrical resistance in electronic circuits. Led resistor calculator learning about electronics. Instead of using advanced javascript functions that would make the script incompatible with older browsers, i. This parallel resistance calculator calculates the total resistance value for all the resistors connected in parallel. Simply select the voltages you would like, and rescalc will find the best resistors in e12 or e24. There is an additional color strip as temperature coefficient in 6 band resistor color code for high accuracy and precision. This is often done to set the division ratio in a voltage divider, for example. You may want to check out more software, such as led manager, diamond calculator or free investment calculator, which might be related to led resistor calculator. Both of these conversions are available for 4 band, 5 band, and 6 band resistors. Download resistor color code calculator 4, 5 and 6 band. The formula for calculating the output voltage is based on ohms law and is shown below.
The 120 ohm resistor has a value ranging between 110 and ohms. Series parallel resistor calculator electronics 2000. Resistor colour code solver is a featured resistor value calculator which offers both color code to value and value to color code conversions. If you like it please feel free to a small amount of money to. Although the program was tested rigorously, it still may have a few bugs. Led resistor calculator required value of resistor for leds circuit. For resistor calculator, enter the colors on the resistor above. Resistor color code and surface mount device smd calculator software. If the resistor is 5 colored, leave only the temperature coefficient empty. Use this utility to find the optimum set of resistors for a circuit of resistors from the resistor sequence. Reverse engineered resistor calculator resistor search of r1 and r2 with known total. A more complicated task is to pick resistors to satisfy a ratio.
Clicking calculate r1 and r2 will find the optimum pair of resistors from the selected range of preferred values, for a. Select the number of bands, then their colors to determine the value and tolerance of the resistors or view all resistors digikey has to offer. Definitions and calculations resistor and resistance. Also includes and ohms law calculator and a resistor color code quiz currently in the process of being implemented. Tags calculator, download, electronic software, resistor post navigation. Sometimes we need a resistor value more precice than what is offered in the standard series. Reverse engineered resistor calculator resistor pairs search of r1. A helpful little utility that allows you to find the value of a standard resistor without memorizing the color codes. E12 series resistor color code examples hobby hour.
Software that calculates the resistor value and its power consumption in different leds circuit configurations simple, series o parallel according to the source voltage, the leds voltage and the wanted current value. Resistor code calculator download free downloads and. This page is a web application that design circuits of resistors. It can also calculate resistor value if it is provided with the relevant colour code. Adjustable symmetrical power supply with lm317 and lm337. Calculate resistor color codes with this handy reference app. As a bonus, it will also calculate the power consumed by the led. Resistor color code calculator 3, 4 and 5 band resistors. Led resistor calculator free download windows version.
Just add the number of resistors in the first column, and then enter the values of each resistor with selecting the proper unit of resistor value in. They still can be found in vintage radios, old amplifiers, etc. Select the first 3 or 4 bands for 20%, 10% or 5% resistors and all 5 bands for precision 2% or less, 5band resistors. Use this online calculator to find the value of the current limiting series resistor when burning. Displaying the closest resistor of the e series and renard numbers. They are used for various purposes, for example, to limit electric current, as a voltage dividers, to provide bias to active circuit elements, to terminate transmission lines, in. For example, for e12 has twelve steps between any power. Resistor calculator series and parallel if you need a nonstandard resistor value you could probably realize a close match using two resistor.
A voltage divider circuit is a very common circuit that takes a higher voltage and converts it to a lower one by using a pair of resistors. Resistor finder finds a combination of two series or parallel connected resistors for a custom value. Color code calculation resistor color code input table resistor. Download resistor calculator a practical, effective and useful application that helps you to determine the color code of a resistor and calculate resistors for led circuits. It will then provide you with the most suitable and closest resistor of the e series e12, e24, e48 etc. Until fairly recently, 10% tolerance resistors were the norm, but today, 5% e24 resistors seem to be the most commonly used. A resistor is perhaps the most common building block used in circuits. When an engineer designs a circuit, they work out the component values which make it work as well as possible. The industry standard resistor color code is used to identify the resistance value of resistors used in all kinds of electronics. Resistor calculation for led circuits single, in series, parallel. Led series resistor calculator use this tool to calculate the resistance required to drive one or more seriesconnected leds from a voltage source at a specified current level. Online calculators, software downloads, technical data, beginners guide, pinouts.