I am now able to much more efficiently and effectively tune my organ to the exact frequencies of standard notes. The resulting output and configuration is described below. 001 nF (much less than the tolerance on a standard capacitor) that I can create using capacitors I already had lying around.

Using my program, I was able to calculate an equivalent capacitance value within. Using this equation where R1 = 100 kOhm and R2 = 10 kOhm, I calculated that a 27.33 nF capacitor will produce an A4 note (frequency 440 Hz).

Now with this web application, I can design my organ for a specific frequency and tune it to the notes on a keyboard! The equation below is used to calculate the specific frequency and is discussed in the other Instructables project. This process was incredibly tedious and I eventually just gave up and went with capacitor combinations that produced any amount of audible frequency. When designing the circuit for my organ as a part of my Battle of the Bands Instructable Project, I had to try to hand calculate the best combination of capacitors to achieve a specific frequency. Sometimes they don't even make a component with that unique value! Instead of giving up or settling for something that's less than ideal, I decided to write a program to look at every possible combination of resistors (every possible value and whether they are in series or parallel) and return the best combination. A lot of times, I don't have a resistor or capacitor with that specific value. There are many different circuits I construct that demand a very specific resistor or capacitor. This web application was developed out of necessity. Please let me know if you have any suggestions to further improve the usability of this design tool! To view the source code, visit this Github repository. To try out the calculator, visit this web application. Just select resistor or capacitor, enter the target value, input the max number of components you would like to use, enter a list of the values of the components you have, and click calculate! The program will spit out what components to use and how to connect them to achieve your target value.

Instead of solving a huge multivariable optimization problem with millions of different combinations, use this program! Have you ever needed a specific resistor or capacitor that you don't have or that doesn't exist? Have no fear! You can probably make that specific resistance or capacitance value using components you already have. This is not just another series/parallel equivalent resistance calculator! This program calculates how to combine resistors/capacitors that you presently have to achieve a target resistance/capacitance value that you need.

Resistor combination calculator