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Hipster Logic has released an iPhone electronics reference app, called, well… Electrical Ref. From their iTunes description:

Have you ever wondered how many Ohms that resistor your holding is? Maybe wondered what the capacitance is of a ceramic disc capacitor with the code 103? Forgotten how to assemble a 555 timer circuit? Or wondered how to make your Arduino detect an EMF? Then Electrical Ref is the app for you. It features a resistor calculator, capacitor calculator, & circuit diagrams.

The app costs a buck.

Electrical Ref

Gareth Branwyn

Gareth Branwyn is a freelancer writer and the former Editorial Director of Maker Media. He is the author or editor of a dozen books on technology, DIY, and geek culture, including the first book about the web (Mosaic Quick Tour) and the Absolute Beginner’s Guide to Building Robots. He is currently working on a best-of collection of his writing, called Borg Like Me.



  1. Garrett says:

    I’d be REALLY impressed if it used the camera to identify resistors and overlay their values in live view.

    1. Ookseer says:

      I thought about hacking together an app that does just that, but my 2nd Gen iPhone’s camera just can’t handle taking a photo close enough for it to work. Heck, it can rarely make QR codes work, and they’re just black & white.

      I know the 3gs can take better macro photos, but I’m not sure if it’s yet good enough for this application.

  2. David says:

    It can’t be serious, a buck for an app that can be easily replaced by some easy thinking.

  3. Jeremy Brooks says:

    I use these apps:

    LED Resist

  4. James says:

    I got myself Electronics Toolkit and iTronixpal. The first one is free, and the latter cost a buck, but very nice looking.

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