V be base emitter voltage v rb base resistor base resistance. This simple and accurate calculator for your iphone or ipad, will help you determine the value of any smd resistor. The industry standard resistor color code is used to identify the resistance value of resistors used in all kinds of electronics. It only requires some simple mathematics that can easily be done by hand. It includes a resistor colour code calculator, resistance, capacitance. Transistor base resistor calculator kaizer power electronics. That gain is in the neighborhood of 100, if we used for example a 2n3906 transistor.
Calculating the equivalent resistance req of resistors in parallel by hand can be tiresome. Need help calculating resistance for transistor base. You can calculate the value of an unknown resistor with this program. Resistor calculator software free download resistor calculator top 4 download offers free software downloads for windows, mac, ios and android computers and mobile devices. Both of these conversions are available for 4 band, 5 band, and 6 band resistors.
If the resistor is 4 colored, leave the 3rd band and temperature coefficient empty. Select the first 3 or 4 bands for 20%, 10% or 5% resistors and all 5 bands for precision 2% or less, 5band resistors. The app is useful for every maker, engineer, student and arduino or raspberry pi tinkerer when working with electronics. To use this tool, simply click on a particular color and number and watch how the actual bands on the resistor illustration change. Calculating resistor values for transistor circuit. Im having some trouble working out the correct value for a base resistor to use with an npn transistor. Voltage divider calculator software potential divider calculator lc resonance. This calculator helps determine the output voltage of the divider circuit given the input or source voltage and the. Bjt transistor bias voltage calculator calculates for. Transistor base resistor, how to calculate electronics forums.
Incidentally, v batt v led is the voltage drop across the resistor, and i led 2 r is the power dissipated by the resistor. As a test, if you input resistances of 3, 9 and 18 ohms, your answer should be 2 ohms. Download resistor color code calculator 4, 5 and 6 band. Use the standard resistor values chart to find the nearest standard resistor value. Resistor color code calculator and chart 4band, 5band or 6. Calculate the total series and parallel resistance of a circuit using digikeys parallel and series resistor calculator. Calculate resistor color codes with this handy reference app.
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. Enter resistances into the boxes below and when all values have been input, click on the calculate button and the result will appear in the box below that button. This led calculator will help you design your led array and choose the best current limiting resistors values. Resistor calculator software free download resistor. Led calculator current limiting resistor calculator for led. Our default conditions are calculated on loading of the calculator but can be changed and recalculated. Transistor simulator calculator, voltage and current. This tool was designed to help you quickly calculate equivalent resistance, whether you have two or ten resistors in parallel. Most of the time, such values have to be memorized and if you do not get used to these items. This transistor simulator calculator is used to calculate the collector and emitter voltage, base current, emitter current, power and collector current using the given inputs. Resistor color code and surface mount device smd calculator software. Having a unique purpose, the software is lightweight and does not consume lots of cpu resources. This resistor determines the amount of saturation current i bsat flowing into the base junction, and that controls the amount of saturation current i csat flowing through the collector and emitter junctions. Our calculator determines the math of transistors, based on data entered.
Resistor color code calculator 3, 4 and 5 band resistors. A helpful little utility that allows you to find the value of a standard resistor without memorizing the color codes. Calculating current limiting resistor values for led circuits. Displaying the closest resistor of the e series and renard numbers. This calculator quickly determines 4 or 5 band resistor values and tolerances. A bipolar junction transistor is a solidstate device in which the current flow between two terminals the collector and the emitter is controlled by the amount of. These values are responsible for enabling transistor. Apr 23, 20 download resistor color code calculator for free.
Dec 29, 2015 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. Consider a base resistor that controls the amount of current entering the base junction of a bipolar junction transistor bjt to. Transistor switch saturation calculator electronic products. To get started, input the 3 or 4 digit code and hit the calculate button. Resistor color code may suit anyone involved in electronics whether he is a student or a professional. The primary purpose of this circuit is to scale down the input voltage to a lower value based on the ratio of the two resistors.
The resistor color code calculator decodes and identifies a value and tolerance of 4 band wire wound resistors. Calculator vbe vce hfe first you must check the datasheet of the transistor in question and identify the values vbe, vce, and hfe. Transistor astable calculator the negative voltage passing through the capacitor c2 turns off the transistor q1 which causes the capacitor c1 to initiate charging through resistor r and vcc, as well as through the base emitter of transistor q2. Circuits which can be designed with transistoramp software. Here is a calculator for transistor base resistor values. They have different numbers of color bands and hence provide different information. The current gain, beta, hfe, is a value you can find in the datasheet for the specific trans. You cant use an arbitrarily high resistor giving you an arbitrarily small amount of emitterbase current through the pnp transistor because the pnp transistor has finite gain. All are shown in the same screen in order to make direct comparisons on values. A bipolar junction transistor bjt was invented in december 1947 at the bell telephone laboratories by john bardeen and walter brattain under the direction of william shockley. Our resistor color code calculator is a handy tool for reading carboncomposition resistors whether its a 4band, 5band or 6band type. Resistor calculation for led circuits single, in series, parallel.
The last two bands that are on 4 and 5 colored resistors are multiplier and tolerance. When the transistor starts to turn on depends upon its gain. Calculate the current you need to pass through the transistor when its on, that is your collector current. Data entry is on the left, a representative schematic is in the middle and results are on the right two areas. Aug 18, 20 assuming a minimum value of 2v and a transistor on voltage of 1v gives an ledtransistor current is 53 330. Transistor base resistor calculator homemade circuit projects.
Calculator voor kleurcodering weerstanden met 4 ringen en tabel. Electronics assistant is a windows program that performs electronicsrelated calculations. V batt is the voltage across the resistor and the led. For a 5v input the voltage drop across the input resistor will be 5 0. Dec 30, 2015 download resistor color code calculator 4, 5 and 6 band. Smd resistor code calculator for ios free download and. What i need to do is use the transistor as a switch. In this software, you have 8 color codes for tolerance level, which include brown, red, green, blue, violet, silver, gold, and grey. Calculate resistor size for leds or identify resistors by code or color. Ive tried researching it but ive come across so many different calculators and formulas that im completely confused.
For resistor calculator, enter the colors on the resistor above. Resistor colour code solver is a featured resistor value calculator which offers both color code to value and value to color code conversions. Download the latest version of resistor color code free in. Resistor color code and smd calculator software electronic. This tool is used to decode information for color banded axial lead resistors. The current gain, beta, hfe, is a value you can find in the datasheet for the specific transistor. Resistor color code calculator and chart 4band, 5band. Resistor equipped transistors rets space and costsaving solutions that reduce your component count and simplify circuit design by combining transistors with their attendant resistors, rets make excellent space and costsaving solutions. Electronic toolbox is an application about electronics components, it helps perform complex circuit computations, it covers detail information about electronics.
Transistor astable calculator homemade circuit projects. 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. Also includes and ohms law calculator and a resistor color code quiz currently in the process of being implemented. The two resistor voltage divider is one of the most common and useful circuits used by engineers. To get started, input the required fields below and hit the design circuit. Resistor calculator is an app developed by cherryjourney to help the user find the value of a resistor. This tool was designed to help you quickly calculate equivalent. Base resistence needed to drive transistor into saturation. Enter the color of your resistor and resistor color code will manage to provide you the matching value. In order to use this calculator, you will need to know the input switching. The calculation of resistor values is a multistep process that uses data from datasheets for both the load and the transistor being used. If the resistor is 5 colored, leave only the temperature coefficient empty. Conversion calculator parallel and series resistor digikey. Calculating base resistor for transistor all about circuits.
Transistoramp software is able to design a transistor amplifier circuit in. First you must check the datasheet of the transistor in question and identify the values vbe, vce, and hfe. From the data sheet the 2n3904 has a gain that varies from 100 to 300 at 10ma with a collector emitter voltage of 1v. Im using a picaxe ics output to turn the transistor onoff. This calculator can determine the resistance of up to 10 resistors in parallel. Figure 1a shows an example of a single led circuit. The following are tools to calculate the ohm value and tolerance based on resistor color codes, the total resistance of a group of resistors in parallel or in series, and the resistance of a conductor based on size and conductivity. You can pass your mouse or click on it over the blue underlined text in the calculator to obtain more information about that area.
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