Converters & Tools

The lm2596 calculator is an online tool that will help in the voltage regulator design process. It is an adjustable three terminal positive voltage regulator. To set the fixed output voltage of the LM2596 IC, two external resistors are required, this online tool calculates the values quickly and accurately.

An LM2596 -ADJ is a 3-terminal adjustable step-down switching voltage regulator IC which is easy for convenient design of buck converter.

LM2596 CALCULATOR TOOL

Vo: Volt (V)
R1: Ohm (Ω) Kiloohm (kΩ)
R2: Ohm (Ω) Kiloohm (kΩ)

Nearest standard value:
R2:

To use the above lm2596 resistor calculator online tool, simply type the value of targeted voltage value to be regulated, and the value of resistor R1. The calculator tool will then calculate the value of the R2 resistor.

Click here!! to find detail on IC LM2596 DC DC buck converter & schematic with datasheet.

^Input values for Vo must range from 1.23 to 37V. Always check for Standard available value of resistor, or you can use customized resistor. Default value of resistor R1 here is 1KΩ.

Due to its 150 kHz switching frequency, LM2596 requires smaller filter components compared to that would be required by lower frequency switching regulators. As it is a switching regulator, the internal reference voltage of the lm2596 is more precisely adjustable, with the output current supplying capability of 3.0 Amp or more. Also, it has wide input range (Vi) up to 40 Volts.

A designer or engineer can calculate resistor values with this tool quickly at ease, without the need to calculate complex formulae or manual calculations.

The formula for regulated output voltage is:

Vo = 1.23 x (1 + R2/R1)
Where,

R2 and R1 are external feedback resistor or shunt resistors or programming resistor. The programming resistor is there to provide feedback voltage to the regulator at which the output voltage is to regulate.

Check LM337 Calculator tool, which may be useful for you.

Using the lm2596 Resistor Calculator Online Tool

For example, suppose you want to use a lm2596 to regulate the output voltage of a power supply to 5V. The internal reference voltage of the lm2596 is 1.23V. Using the lm2596 calculator tool, you would input 5V to get regulated voltage. Choose R1 value, say (1kohm). The voltage LM2596 calculator tool would then calculate and display R2 resistors value (say 3 kilo-ohm).

Lm2596 comes with the features like, TTL shutdown, thermal shutdown, internal loop compensation, and cycle by cycle current limiting.

The tool will prevent calculation errors and circuit damage by accurately calculating resistor values based on the desired output voltage and lm2596’s continuous feedback voltage. The LM2596 has a lot of applications not limiting to negative power supply solutions, efficient pre regulator for linear regulator, high efficiency buck regulator and so on

The lm337 calculator is a helpful online tool that can simplify the voltage regulator design process. LM337 is an adjustable three terminal linear negative voltage regulator. With this online tool, you can calculate the two resistor values for the Lm337 IC’s fixed output voltage quickly and accurately.

The LM337 is a 3-terminal adjustable voltage regulator IC which is having variants like LM317-N also some of the alternatives are LM137 and LM237 with almost similar functionality with hardly any difference limited to operating temperate and maximum input voltage.

LM337 CALCULATOR TOOL

Vo: Volt (V)
R1: Ohm (Ω) Kiloohm (kΩ)
R2: Ohm (Ω) Kiloohm (kΩ)

Nearest standard value:
R2:

To use the above LM337 resistor calculator online tool, you need to type the output voltage to be regulated, and the value of available resistor R1. The calculator tool will then display the required values of the R2 external resistor.

^LM337 designed to operate at Vo and should range from -1.2 to -37V. Default value of resistor R1 here is 1KΩ (you can choose any resistor value). It is recommended to select the resistors with tolerance of 0.5%, 1% or 2% in voltage regulator feedback circuit.

The lm337 calculator tool is an online tool that facilitate users to input the output voltage to be regulated with the help of lm337 and provides the suitable external resistor values according to the formula mentioned in the datasheet. The internal reference voltage of the lm337 is designed at -1.25 volts, with the current supplying capability of -1.5 Amp or more.

The formula for regulated output voltage is:

Vo = – 1.25 x (1 + R2/R1)
Where,

R2 and R1 are feedback resistor or shunt resistors. The feedback resistor or shunt resistor are there to provide negative reference voltage (Vref) to the regulator.

Read datasheet of lm337 here

Also visit LM317 Calculator tool here

Using the lm337 Resistor Calculator Online Tool

For example, suppose you want to use a lm337 to regulate the output voltage of a power supply to -5V. The internal reference voltage of the lm337 is -1.25V. Using the lm337 calculator tool, you would input -5V to regulated voltage. Choose R1 value, say (1.1kohm). The LM337 regulator calculator tool would then display the required values of the R2 resistors (say 3.3 kilo-ohm).

LM337 has an inbuilt protection, it is having internal current limiting, thermal shutdown, and safe operating area features to prevent blowout.

In addition to preventing errors in calculations, the tool can also prevent component damage and circuit malfunctions. A LM337 regulator calculator can be a valuable tool in your bookmarks as LM337 has a lot of applications not limiting to industrial power supply, factory automation, PLC system, set-top boxes, instrumentation.

The lm317 calculator is a helpful online tool that can simplify the voltage regulator design process. It is a one of the most widely used voltage regulator that has been used in many different electronic circuits for a long time. It is an adjustable three terminal positive voltage regulator. This online tool can quickly and accurately calculate the values for the two external resistors required to set the fixed output voltage of the lm317 IC.

Most popular LM317 is a 3-terminal adjustable voltage regulator IC which is having multiple variants like LM317T LM317-N LM317A LM317HV with same basic functionality with hardly any difference limited to operating temperate and maximum input voltage.

LM317 CALCULATOR TOOL

Vo: Volt (V)
R1: Ohm (Ω) Kiloohm (kΩ)
R2: Ohm (Ω) Kiloohm (kΩ)

Nearest standard value:
R2:

To use the above lm317 resistor calculator online tool, simply input the desired output voltage to be regulated, and the value of resistor R1. The calculator tool will then display the required values of the R2 external resistor.

^Input values for Vo must range from 1.2 to 37V. Always check for Standard available value of resistor, or you can use customized resistor. Default value of resistor R1 here is 1KΩ. Choose the resistors with tolerance of 0.5%, 1% or 2%

The lm317 calculator tool is an online tool that facilitate users to input the output voltage to be regulated with the help of lm317 and provides the suitable external resistor values according to the formula mentioned in the datasheet. The internal reference voltage of the lm317 is designed at 1.25 volts, with the current supplying capability of 1.5 Amp or more. Vi must range between 4.25 and 40 Volts for smooth operation.

A designer or engineer can calculate resistor values with this tool quickly at ease, without the need to calculate complex formulae or manual calculations.

The formula for regulated output voltage is:

Vo = 1.25 x (1 + R2/R1)
Where,

R2 and R1 are feedback resistor or shunt resistors. The feedback resistor or shunt resistor are there to provide reference voltage (Vref) to the regulator at which the output voltage is to regulate.

Read datasheet of lm317 here

Also visit TL431 Calculator tool here

Using the lm317 Resistor Calculator Online Tool

For example, suppose you want to use a lm317 to regulate the output voltage of a power supply to 9V. The internal reference voltage of the lm317 is 1.25V. Using the lm317 calculator tool, you would input 9V to regulated voltage. Choose R1 value say (1kohm). The voltage regulator calculator tool would then display the required values of the R2 resistors (say 6.2 kilo-ohm).

One of the main advantages of using a lm317 is that it is having current limiting, thermal overload protection, and save operating area protection features.

Additionally, the tool can help prevent errors in calculations that can lead to circuit malfunctions or damage to components. By inputting the desired output voltage and the internal reference voltage of the lm317, the tool can ensure that the resistor values are calculated correctly. A voltage regulator calculator can be a valuable tool in your design journey as LM317 has a lot of applications not limiting to power supply solutions, Battery charger, Power-bank solutions, Motor-controls, signal generators.

The TL431 calculator is one of the useful tool that can help simplify the design process. It is a popular voltage regulator and has been in use for a long time in many different electronic circuits. This IC is an adjustable shunt regulator IC. This tool can quickly and accurately calculate the values for the two external resistors required to set the fixed output voltage of the TL431.

TL431 CALCULATOR TOOL

Vo: Volt (V)
R1: Ohm (Ω) Kiloohm (kΩ)
R2: Ohm (Ω) Kiloohm (kΩ)

Nearest standard value:
R2:

^Input values for Vo must range from 2.5 to 36V (other input could give invalid output values). Always check for Standard available value of resistor, or you can use customized resistor. Choose higher values of R1 if possible to reduce power consumption.

Always use 0.5%, 1% or 2% tolerance Resistor in voltage regulator feedback circuit to ensure near exact regulated output voltages.

The TL431 calculator tool is a free online tool that allows users to put in the desired output voltage to be taken from TL431 IC and calculate the required values of the external resistors to achieve that voltage. The tool takes into account the internal reference voltage of the TL431 for calculation, which is designed at 2.5V.

With the above tool, designers and engineers can quickly and easily calculate the resistor values without the need for complex mathematical formulas or manual calculations.

The formula for regulated output voltage be:

Vo = 2.5 x (1 + R1/R2)
Where,

R1 and R2 are feedback resistor or shunt resistors. Feedback resistor or shunt resistor are there to provide reference voltage (Vref) to the regulator at which the output voltage is to regulate.

Read more about TL431 here
Read datasheet of TL431 here

Using the TL431 Resistor Calculator Online Tool

To use the TL431 resistor calculator online tool, simply input the desired output voltage, the value of R1 resistor. The calculator tool will then display the required values of the two external resistors.

For example, suppose you want to use a TL431 to regulate the output voltage of a power supply to 12V. The internal reference voltage of the TL431 is 2.5V. Using the TL431 calculator tool, you would input 12V for the desired output voltage. Choose R1 value higher than 1 kilo-ohms, say (1kohm). The voltage regulator calculator tool would then display the required values of the R2 resistors (say 3.8 kilo-ohm).

One of the main advantages of using a TL431 calculator online tool is that it simplifies the design process and saves time. Instead of manually calculating the values of the external resistors, the tool can quickly and accurately provide the values needed to achieve the desired output voltage.

Additionally, the tool can help prevent errors in calculations that can lead to circuit malfunctions or damage to components. By inputting the desired output voltage and the internal reference voltage of the TL431, the tool can ensure that the resistor values are calculated correctly. Whether you are designing a power supply, battery charger, or LED driver, the TL431 voltage regulator calculator tool can be a valuable asset in your design toolkit.

This series LED resistor calculator comes handy when you have a single LED of the same color or different color of LEDs and need to know which resistor you should use. This calculator will give you the value of series LED resistance that could be used in series with an LED to prevent it from damaging due to over current.
One of the features of this calculator is that it will also give you power dissipation due to LED as well as resistor. Also suggests the Standard Value of Resistor according to E3, E6, E12, E24, so that you can directly use the nearest available standard resistors.

To use this calculator, enter three known values (Vs, Vf, If) and press “Calculate” to solve for the others.

LED Resistor Calculator

Supply voltage (Vs):
V
Forward voltage (Vf):
V
Forward current (If):
mA

Resistor value (R):

Nearest available Standard resistor:

Second available Standard resistor:

Power Dissipation across LED:

Power Dissipation across resistor:

Check Typical forward LED Voltage (Vf) calculator for different colors Here !! 

You can directly check most commonly used LED Resistor Value for different battery/ cells.

Power Dissipation is calculated considering the actual calculated value of ‘R’. When using the standard value of resistor, consider the selected value for Power Dissipation calculation.

PL = Vf x If     <for LED>

PR = R x I^2   <for Resistor>

To calculate the resistor value manually or theoretically, needed for a simple LED circuit, apply Ohm’s Law, then substitute parameters.

V = I x R    —<ohm’s law>

Vs = Vr + Vf    —<total voltage drop>

Vs = Ir.R + Vf      —<Vr = Ir.R>

Ir.R = Vs – Vf     —<adjusting the eq.>

R = (Vs – Vf )/Ir     —<we know that Ir= If >

R = (Vs – Vf )/If    —<final result>

So the equations…

where:

• VS is the source voltage, measured in volts (V),
• Vf is the forward voltage across the LED, measured in volts (V),
• Ir = the the current through the Resistor*, measured in Ampere (A), and
• If = the current through the LED*, measured in Ampere (A), and
• Rs = R is the current limiting series resistor, measured in Ohms (Ω).

* All the components are in series, thus the current through the circuit will be the same. Therefore, “If = Ir” = the current through the Resistor = the current through LED

This calculator is a fundamental application of Ohm’s Law Calculations, adding the consideration of the voltage drop from the LED.

The 3-band resistor color code calculator is a helpful online tool that simplifies the process of determining the resistance value of a cylindrical color band resistor. For long period, resistor values are conveyed through color-coded bands painted on the resistor, which could be challenging to read, particularly for those who are not familiar with the color-coding methods. Thankfully, the 4-band resistor color code calculator eliminates the guesswork and facilitates easy determination of resistor values. With this tool, you can enter the color bands of your resistor and get an instant calculation of its resistance value, thus taking the hassle out of resistor value calculations.

To use a 3-band resistor color code calculator, simply enter the colors of each band into the corresponding fields on the calculator from left to right.

For example, let’s say you have a resistor with the colors Brown, Black and Red. To calculate the value of this resistor using the 3-band color code calculator, you have to enter “brown” in the 1st field, “black” in the 2nd field, “red” in the 3rd field.

Press the ‘Calculate’ button to get the values. And press the ‘Reset’ button to use it again.

Also Check, 4 Band Resistor Value Calculator here!

If you are on the way to calculate the 3 band resistor value on paper by looking at its color coded band then you can do so by following information.

Calculating the value of a 3-band resistor :

by looking at the color bands may seem challenging at first, but it’s actually quite simple once you understand how to do it:

Step 1: Identify and Determine the color for each band on resistor

Next, you need to determine the color codes for each of the 3 bands. The color codes for the first two bands represent the resistance value of the resistor. The third band represents the multiplier or number of zeros, and the fourth band is absent here, which represents the tolerance.

Step 2: Calculate the resistance value and tolerance value

In order to calculate the resistor’s resistance value, combine the first two color bands and multiply them by the multiplier value represented by the third band. The absence of fourth band represents the tolerance value of the resistor is ± 20%, which shows the range in which the actual resistance value can vary from the exact value and intended value in %.

For example, if the bands on the body of the resistor are Red, Red and Orange.
Then from the table 1st red band means significant digit of 2, second red band means significant digit 2, third is Orange means multiplier means 10^3, and the 4th Absent means 20% tolerance.

Thus, the resistor value is 22 *10^3 and its tolerance is 20% that is 22 kΩ ± 20%

In electrical and electronics circuits, resistors are one of the important components, which is used to limit the flow of current. Calculating the voltage drop across a resistor can be a boring and demanding task for someone who doesn’t believe in calculating much, as it involves some math and there is always room for some manual error/ calculation mistakes. Nevertheless, with the help of voltage drop across resistor calculator tools, this process is made simplified for you.

In this post, you have two voltage drop across resistor calculator tools for different circuits – one for the 2 resistors in series circuit and the other for 3 resistors in series circuit.

Voltage Drop Across Resistor Calculator Tool for 2 Resistors in Series:

Enter the values below and click the “Calculate” button to find the voltage drop across R2 and R1.

RESISTOR DROP ACROSS RESISTOR CALCULATOR

  Vin : (Volts)

    R1: Ω kΩ MΩ

    R2: Ω kΩ MΩ

         

  Calculations:

The voltage across each resistor in series is inversely proportional to the total equivalent resistance (R1+R2) and directly proportional to the corresponding resistor at which voltage drop is to be calculated. To calculate the voltage across each resistor in a series circuit, we can use the following formula:

V1 = (R1 / (R1 + R2)) x V

V2 = (R2 / (R1 + R2)) x V

where V is the total input voltage or source voltage, R1 and R2 are the resistances of the two resistors, and V1 and V2 are the voltages across the individual resistors.

To simplify this calculation, you can use the voltage drop across resistor calculator tool for two resistors in series. This tool requires input values of the total voltage and the values of the two resistors. The tool then calculates and displays the voltage across each resistor.

It is important to note that this tool only works for two resistors in series. For circuits with more resistors, we need to use a different tool.

• Check 4 Band Resistor Color Code Calculator here
• Check 5 Band Resistor Color Code Calculator here

Voltage Drop Across Resistor Calculator Tool for 3 Resistors in Series

Enter the Values with proper units below and click the “Calculate” button to find the voltage drop across each resistors.

RESISTOR DROP ACROSS 3 RESISTOR CALCULATOR

    Vin : (Volts)

      R1: Ω kΩ MΩ

      R2: Ω kΩ MΩ

      R3: Ω kΩ MΩ

           

  Calculations:

 

The voltage across each resistor in series is inversely proportional to the total equivalent resistance (R1+R2+R3) and directly proportional to the corresponding resistor at which voltage drop is to be calculated.  To calculate the voltage across each resistor in a series circuit, we can use the following formula:

V1 = (R1 / (R1 + R2 + R3)) x V

V2 = (R2 / (R1 + R2 + R3)) x V

V3 = (R3 / (R1 + R2 + R3)) x V

whereas, V is the total input voltage or source voltage, R1, R2, and R3 are the resistances of the three resistors, and V1, V2, and V3 are the voltages across the individual resistors.

To simplify this calculation, we can use this voltage drop calculator tool for three resistors in series. This tool requires input values of the total voltage and the values of the three resistors. The tool then calculates and displays the voltage across each resistor.

It is important to note that in a series circuit, the sum of the voltages across each resistor is equal to the total voltage. Therefore, we can use this property to check the accuracy of our calculations.

• Check Voltage Drop Across Resistance here
• Check Voltage Divider Rule here

Check Your Homework Before Submitting with voltage drop across resistor calculator:
Before you submit any homework or assignment that involves calculating the voltage drop across a resistor, it’s important to double-check your calculations. One way to do this is to use an online voltage drop across the resistor calculator, which can help you quickly verify your results and identify any errors. It is important to check your assignments/ homework before submitting it to ensure accuracy.

A 5-band resistor color code calculator is an online tool for getting any resistor value effortlessly. Resistor values are generally represents by color-coded bands printed on the resistor itself, which can be sometimes difficult to decode even if you have remembered the color codes chart in mind. Also, it could be wondering for those who are not familiar with the resistor color code system. By simplifying the value calculations for 5-band resistors, this calculator removes the assumption involved in resistor value calculations.

To use a 5-band resistor color code calculator, simply enter the colors of each band into the corresponding fields on the calculator from left to right.

For example, let’s say you have a resistor with the colors Yellow, Violet, Black, Red, and Gold. To calculate the value of this resistor using the 5-band color code calculator, we would enter “Yellow” in the first field, “Violet” in the 2nd field, “Black” in the 3rd field, “Red” in 4th and “gold” in the 5th field.

And press the ‘Calculate’ button to get the values. And press the ‘Reset’ button to use it again.

Also Check, this Online 4 Band Resistor Value Calculator Tool here! & 3 Band Resistor Color Code Calculator

Link: Download this 5 band resistor color code chart pdf in HD now!

In case you want to calculate the 5 band resistor value manually based on the color coded bands then you can do so by following these instructions. In brief, a resistor’s value is signified by the first three bands and a multiplier by the fourth band, and the last band denotes the tolerance value.

Calculating the value of a 5-band resistor :

It may seem complicated at first, but once you know how to use the color bands, it’s actually quite simple:

Step 1: Identify and Determine the color for each band on resistor

Next, you need to determine the color codes for each of the five bands. The color codes for the first 3 bands indicate the resistance value of the resistor. The 4th band indicates the multiplier value or the number of zeros, and the last band represents the tolerance value.

Step 2: Calculate the resistance value and tolerance value

In order to calculate the resistor’s resistance value, combine the first three color bands and multiply them by the multiplier value represented by the 4th band. In the fifth band, the tolerance of the resistor is shown as a percentage, showing the range between the real and expected resistance values.

For example, if the bands on the body of the resistor are Yellow, Violet, Black, Red, and Gold.
Then from the table 1st Yellow band means significant digit of 4, second Violet band means significant digit 7, third is Black significant digit of 0, fourth Red band means multiplier means 10^2, and the 5th Gold means 5% tolerance.

Thus, the resistor value is 470 *10^2 and its tolerance is 5% that is 47kΩ ±5%

Conclusion:

The 5-band resistor color code calculator is an essential tool for anyone working with designing or repairing or engineering an electronics/ electrical circuits and project. It sorts out the process of calculating resistor values and saves a lot of time and energy. With the help of this resistor color code calculator, you can easily find the values of these color banded cylindrical resistors regardless of the color code chart of the resistor.