This website, https://resistorcalc.org/ , is an online Resistor Replacement Calculator .
Its main purpose is to help you find equivalent resistor combinations, which is especially useful when you don’t have the exact resistor value you need for a circuit .
Here is an overview of its main features and functions:
### How to Use
1. 1.
Enter Target Resistance : Input the resistance value you need to replace, with units in Ω, kΩ, or MΩ .
2. 2.
Choose E-Series : Select the appropriate series based on your precision requirements: E12 (5%), E24 (5%), E48 (2%), or E96 (1%) .
3. 3.
Get Combinations : The calculator instantly provides all possible resistor combinations, ranked by accuracy, including series, parallel, and mixed configurations .
### Core Features
– Standard E-Series Values : The calculator uses standard resistor values from the E12 (5% tolerance) to the E96 (1% tolerance) series .
– Multiple Connection Types : It can calculate series, parallel, and series-parallel combinations, providing precise error percentages for each .
– Fast Calculation : It finds hundreds of combinations instantly, saving you from manual calculations .
– Educational Tool : The site also provides circuit diagrams and formulas for how resistor combinations work, such as:
– Series : R_total = R1 + R2
– Parallel : R_total = (R1 * R2) / (R1 + R2)
– Series-Parallel : R_total = R1 + (R2 || R3)
– Cost Saving : You can use your existing resistors to create the value you need instead of buying new ones, which is ideal for prototyping and repairs .
### Target Audience
This tool is well-suited for engineers, technicians, and students involved in circuit design, repair work, electronics prototyping, and education .
In summary, it is a free, professional, and highly practical online tool developed by electronics engineers with over 20 years of combined experience .