Opening the iTunes Store.If iTunes doesn't open, click the iTunes application icon in your Dock or on your Windows desktop.Progress Indicator

iTunes is the world's easiest way to organize and add to your digital media collection.

We are unable to find iTunes on your computer. To buy and download Circuit Sidekick by Collin Cunningham, get iTunes now.

Already have iTunes? Click I Have iTunes to open it now.

I Have iTunes Free Download
iTunes for Mac + PC

Circuit Sidekick

By Collin Cunningham

Open iTunes to buy and download apps.


Never solder solo again - Circuit Sidekick has got your back!
Now a Universal app with support for Retina displays!

Decipher resistor & capacitor codes in a flash, quickly calculate resistance needed for powering any LED, Convert decimal, binary, & hexadecimal numbers, search & view your entire datasheet collection - and more, all from one intuitively designed app.

Designed specifically for iOS, Circuit Sidekick is the one-stop electronics tool kit for makers, hackers, hobbyists and visually-oriented engineers. Current feature list includes:

• Resistor Color Code Converter w/ forward & backward functionality

• Resistor & Capacitor Series/Paralell wiring calculators with schematic views

• Capacitor Code Calculator with integrated capacitance value Conversion

• Decimal/Hexadecimal/Binary Number Converter (+ standard ASCII codes)

• Integrated PDF Viewer with search & storage for IC datasheets.

• The touch-based Ohm's Law Triangle! V=I*R, in classy wood finish

• Choice of light or dark interface design and more

Additional features & enhancements coming soon!

What's New in Version 1.6

• Compatible with iOS 6
• Optimized for iPhone 5
• Improved input value saving
• Revised UI elements on iPhone & iPod touch
• Memory optimizations
Please note - this update requires iOS 4.3 or later!


iPhone Screenshot 1
iPhone Screenshot 2
iPhone Screenshot 3
iPhone Screenshot 4
iPhone Screenshot 5
iPad Screenshot 1
iPad Screenshot 2
iPad Screenshot 3
iPad Screenshot 4
iPad Screenshot 5

Customer Reviews

Best available tool for an electronics hobbiest

Worth the price. It provides all it promises with a clear user interface and easy to use tools and explanations.

However I would really like it if it were possible to:
-Download data sheets from the iOS Safari App directly rather than through iTunes
-Save component profiles for easy recalculation and reference

Pretty basic

I had the resistor color codes memorized before I was 12, so while it would be useful to a beginner, I don't need it. 56 years later, including a 25-year hiatus during which I did only software, and I still know it.

Cosmetic bug: the text for capacitors in picofarads says "nf".

I didn't know anyone still used the 555/556 timers.

The parallel resistance calculator is convenient. To me, probably the most compelling feature. Doing that computation is a pain on a standard calculator. But it should also let me choose the target resistance and give me a drop down list of standard resistor values for various tolerances. I need 992 ohms, what value(s) do I pair it with to get 992 ohms? And what is the expected range if I use 5% or 10% resistors? And what about wattage? I need a 1.2K at 1 watt, do two 2.7K 1/2 watt resistors get me close enough? (The more interesting case is using 1/8 W resistors in DIP or SMT to handle off-board interfaces or handle voltage regulators)

Now that I think of it, a power-supply design app using standard 3.3v or 5v logic and various regulators would not be a bad addition. And some Moments Of Zener wouldn't hurt.

But I digress (I usually digress; deal with it). A handy app for a couple features, but I wish it had more. Or even the ability to add features, such as current and duty cycle for time-multiplexed LEDs...

Circuit Sidekick
View In iTunes
This app is designed for both iPhone and iPad
  • $2.99
  • Category: Utilities
  • Updated: Nov 09, 2012
  • Version: 1.6
  • Size: 10.6 MB
  • Language: English
  • Seller: Collin Cunningham

Compatibility: Requires iOS 4.3 or later. Compatible with iPhone, iPad, and iPod touch. This app is optimized for iPhone 5.

Customer Ratings

We have not received enough ratings to display an average for the current version of this application.
All Versions:

More by Collin Cunningham

Become a fan of the iTunes and App Store pages on Facebook for exclusive offers, the inside scoop on new apps and more.