• Dependent Sources let you specify mathematical expressions for voltage and current sources. These expressions can reference other elements allowing you to solve some of those annying homework problems and simulate complex models.
• Subcircuits allow you to modularize your designs and create custom elements. (Combined with the dependent sources, this is a very powerful new feature.)
• Custom Scope Tracks allow you to perform and plot math on different signals in the circuit.
• Scope Triggers make it easier to analyze high-frequncy or frequency-varying signals.

I am very excited for these new features as they greatly extend the power of this app. I hope you enjoy them as much as I do!

For instance, here's Problem 13 from Chapter 2 of Engineering Circuit Analysis.

This is a free upgrade with a bunch of fixes, a lot of performance and visual improvements, and a few new elements.

I hope everyone enjoys it!

If you had problems saving and opening files with V1.3, please get the free update. And if you missed out on the initial release, now is the best time to go get it!

I cannote justify having the app in the store with this bug so have pulled it down temporarily.

For everyone who has purchased the app, you have my apologies. I am working on a fix now and your app will be updated once I have the fix in the store.

Update 8/17/11 The problem has been identified, fixed, and the app has been resubmitted to Apple! Thank you all for your patience.

This is the first time the app is running on a non iOS device, and I think you'll agree it's never looked better.

Running on the Mac, iCircuit is given access to a huge CPU and a lot more memory, this means that editing is a faster and smoother experience than ever before. Also, some iOS restrictions have been lifted: circuits can be larger, and there is no restriction on the simulator bandwidth.

I am very pleased that this is out as the 2011 school year is beginning, I wish all students out there the best of luck.

I hope you enjoy creating and playing with circuits on your Macs as much as I do!

If you have the time, please take this 1 question survey: http://twtpoll.com/9ol14w

Your opinion matters a lot to me and I would love to hear what you all think.

And don't worry, a free update to the iPad and iPhone version is coming before September. I'm just planning the future!

As a part of its documentation, I have created a little tutorial on how to use the app. Check it out!

Once this Mac version is out, I will release a bug fix version of iCircuit for iOS that addresses some of the problems introduced with V1.2.

After that, more elements on the way (it's been awhile!) and Android and Windows versions

Exciting times ahead!

I and a bunch of others have been wanting DC Motors in iCircuit for a while, and now we have them!

There are 8 parameters that control how the DC motor behaves.

The first three are the most basic. You can easily find these values for any motor you have:

• Nominal Voltage - Most motors are rated at a specific DC voltage.
• Free Running RPM - The speed of the motor when nothing is attached to it.
• Free Running Current - The current drawn by the motor at its free running speed.

The next most important is:

• Stall Current - This is the amount of current drawn by the motor when it is no longer able to spin. This is used to calculate the electrical resistance of the motor.

The remaining parameters fine tune that model:

• Stall Torque - The maximum torque the motor is able to produce while it is being forced to stop. Torque's SI unit is Nm (Newton meters) but iCircuit asks you to enter oz in (ounce force inches). My apologies non-US users for this.
• Inductance - This is used to model the intrinsic inductance of the motor.
• Inertia - This is the inertia of the rotor of the motor and is specified in units of Nm/s^2. 

The DC Motor will be released with iCircuit 1.3.

• The number of switches in the relay (up to 16)
• The type: Normally-open, Normally-closed, Double-throw
• Nominal coil voltage, resistance, and inductance
• The on and off resistances of the switches

Here is a picture of the DPDT relay:

Look for them in the soon-to-be-released Mac app, and in the next update to the iPhone/iPad app.

You can go get it for FREE right now on the App Store.

Also, I have decided to release the source code on github. If you're a programmer, you may be interested. https://github.com/praeclarum/lcars

Also, hooking up the new microphone element to the speaker element is great fun and worth the download time! :)

Here are the release notes:

NEW
★ Automatic wiring used when moving parts - keeps your circuit working no matter where you position them
★ iPhone UI upgraded to make it 333% easier to use
★ The wiring tool is now "dramatic" to help you make circuits faster
★ Improved circuit management UI includes easier export and changing default settings of circuits
★ Undo allows you to explore the edit history of circuits and jump to past versions, just press and hold the Undo button for a second to see this history
★ Transformer, SCR, Sweep, Microphone, Accelerometer, and Lamp elements added
★ Element editor now brought up by double-tapping & value inputs have quick magnitude-change buttons
★ Printing and emailing PDFs now supported on iOS 4.2
 
FIXES
★ Lots of bug fixes to make the app compatible with the new iOS
★ Less crashing and much better performance
★ Fixed the annoying popping sound that the Speaker element made (still not perfect, but it's gotten better)

Also included is the ability to pause the scope and to use cursors to get precise values from the graph.

I realize that not everyone's desired features made it into this release (sorry, no voltage regulators yet), but I hope you'll agree with me that this version is much more fun and much easier to use!

These lamps glow yellow when fully warmed up and feature a variety of configuration options.

iPad can go almost anywhere with your employees. And with powerful apps, iPad can transform a traditional paper-based workflow to improve the way employees record and track vital business information. From operations managers to surveyors, logistics supervisors to technicians, iPad can help workers log, process and share information. Sorry, clipboards.

Thanks so much Apple!

Speaking of things EE, the developers of iCircuit ($9.99, four stars), a respected analog and digital circuit simulator and analyzer, refer to it as the "the premier iPad and iPhone app for designing and experimenting with circuits." We have no reason to doubt them — and it's pretty damn good-looking, as well.

Thanks The Register!

• Two finger dragging to replace the Pin

The Pin was an experiment in UIs to help you manage editing the circuit and panning around with just one finger. But that experiment has caused a lot of frustration in you the users. No more! iCircuit now uses 2 finger panning so you can quickly toggle between editing and panning using just your hands. This is only available on iPads and iOS 4 devices and can also be disabled if you love the Pin.

• Non real-time simulations

The circuit is still "always on" but now you can control the bandwidth of the fixed time step simulator to guarantee accurate results.

• 555 Timer, Potentiometers, and Text Labels

Thanks to your feedback (support@kruegersystems.com), two new elements have been added. The 555 should be great fun for students.

• External display (VGA) output on the iPad

Now you can hook the device up to external monitors, TVs, or projectors to share your circuits with an audience.

• RMS, Peak-to-peak, and Frequency now displayed in the scope

• 5 new examples thanks to Mike Acton

A dedicated user was kind enough to donate a bunch of circuits to making the Examples folder even more interesting.

• Tips on how to use the app can now be accessed form the Home screen

This is a large app with a lot of features. Tips are now here to speed up the learning process. You can also access these tips at http://tips.icircuitapp.com

Bugs Fixed

• iOS 3.1 crashes and bugs have been fixed

There were a variety of errors encountered by users when using iCircuit on 3.1 devices, these have all been fixed.

• Better bounds checking on inputs (circuit size for instance) to prevent crashes

• Failing circuits no longer cause the app to fail to launch

• Send feedback button has been fixed on iPhones

• Performance improvements

Amazing-looking electronics simulation app that I would have loved to have had while doing coursework back in the 90s

I gave the app a quick spin on the iPad, and it definitely shows a lot of potential. The simulator had a tendency to lag a bit behind my realtime changes to the schematic, and the UI took some getting used to, but for $10 it sure beats the mobile simulator competition (which is pretty much nonexistent, to my knowledge).

In any case - a handy tool to have around when away from the lab. As the developer notes, the software is rather CPU-intensive so newer devices are recommended (iPhone 3GS or later)

 

Early feedback from users has been very positive - people are creating circuits that I've never seen (be sure to use the Mail feature)! It's very exciting to see the app being used and enjoyed.

Please send your feedback so you can have a say in what features are added to V1.1!