Circuit Diagram 1.3 Released

December 3, 2011

This update fixes an issue when using Circuit Diagram on computers with some non-English languages.

New Components and Features

The following have been added:

  • Label (add text your diagrams)
  • US-style resistor

Visit the downloads page to download Circuit Diagram 1.3.

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Circuit Diagram 1.2 Released

August 25, 2011

Custom Components

You are now able to include a component in a diagram even if Circuit Diagram does not have built-in support for it. By placing the new component titled "Custom Component" (found under the External Connection category in the toolbox), you can choose a PNG image to be displayed in your circuit diagram.

This enables you to export to PNG or print the diagram containing your custom component.

Please be aware of the following when using this feature:

  • Joins will not appear when your component is connected to another one
  • Saving the document will save the path to the image you have chosen, so your component will not be shown if you send the file to someone else (unless you also send the image)
  • Exporting to SVG is not supported - your component will not be visible
  • Custom components cannot be resized

I hope to add full support for custom components that can be resized, customised and used in the same way as the built-in components in a future version.

New Compnoents

The following components have been added:

  • Push-to-Break Switch
  • Changeover Switch
  • D Flip-Flop


This release also includes bug fixes and adds an error log.

Visit the downloads page to download Circuit Diagram 1.2.

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Circuit Diagram 1.1 Released

August 20, 2011

Recent Files

There is now a list of your last 10 documents, which can be found under File->Recent Files to make opening recent documents easier.

Recent files menu

New Components

The following components have been added:

  • Analogue switch
  • Fuse
  • Ground
  • Transformer


This release also includes bug fixes, including a crash when right-clicking on a component in the toolbox.

Visit the downloads page to download Circuit Diagram 1.1.

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Circuit Diagram 1.0 Released

August 16, 2011

This version has been in development for a while now, and it introduces many new features and components. Due to reasons described below, you must manually uninstall previous versions and then install this version - you will not be notified about this update.

User Interface

The new user interface should make designing circuits much easier. Components are now displayed in the new toolbox on the left hand side, with icons rather than text to tell you which component the buttons represent (a popup also lets you know which is which when you hover over one of the images).

Clicking on one of the items in the toolbox allows you to place that type of component (or move/resize a component if the select tool is used).

Please note that if not all of the components can be displayed in the toolbox at once, a scroll bar will be shown. This can be disabled by going to Tools->Options and disabling "Show toolbox scroll bar".

You can still use the mouse wheel to scroll through the components. In addition to clicking on the items, holding the mouse button down over one which has a small triangle in the bottom right hand corner causes it to expand and reveal additional similar components which can be placed instead.

Clicking on one of these sets the first item to the new item, as shown below:



To edit a component, you now simply click on it when the "Select" option from the toolbox is chosen, and the properties for the component will be shown on the right of the main window.

The component is updated as you change these properties - there is no need to click "OK" as in previous versions. You can now use the zoom feature in the lower right hand corner of the main window to zoom in and out when editing your circuit.

Double-click on the "Zoom" label at any time to reset the zoom level back to 100%.

New Components

The following components have been introduced with this update:

  • Photo diode
  • Diode bridge
  • Crystal
  • Microphone
  • Loudspeaker
  • Motor
  • Buzzer
  • Heater
  • Variable capacitor
  • Trimmer capacitor
  • Polarised capacitor
  • Inductor

Application Updates

This version includes a new update system which allows you to check for updates manually through Help->Check for Updates, and also allows you to choose whether to check for updates automatically on start-up (although this will only happen once per day) - this setting can be found in the options window.

This new system means that previous versions of Circuit Diagram will not notify you of this update.

Circuit Diagram Document File Type

Circuit Diagram documents now have their own file extension (rather than .xml as with previous versions).

This means that you can double-click on a file to open it with Circuit Diagram, and Windows 7 users can use the "Recent" jump-list feature when Circuit Diagram is pinned to the taskbar.

I hope you enjoy using this new version. Visit the downloads page to download Circuit Diagram 1.0.

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Coming In Version 1.0

August 12, 2011

Version 1.0 of Circuit Diagram will be a major update with many new features.

The first of these is the brand new user interface, with a new theme and toolbox. This enables components to be represented by icons rather than the current text representation, making it easier to quickly find the component you need.

Editing components will be much easier than the current process of right-clicking and choosing "properties" - a simple click on the component reveals the component editor within the main window with changes being reflected immediately by the component once a property is changed.

On top of these features, there will also be many new components, including more types of capacitor and resistor.

Circuit Diagram 1.0 is expected to be released in the next few weeks.

Please note that version 1.0 will bring a new update system which means that current versions will not notify you when it is released, so please check back here soon!

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Circuit Diagram 0.6 Beta Released

July 12, 2011

New in this Release:

  • New components:
    • Both N-Channel and P-Channel MOSFETS
    • PNP transistor
    • NPN transistor
    • Light dependent resistor
    • Toggle switch (option for switch)
  • Full undo/redo support
  • Confirmation when closing with unsaved changes
  • Other bug fixes including problem when changing thermistor properties

Please visit the downloads page to view available downloads.

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Circuit Diagram 0.5 Beta Released

June 26, 2011

New in this Release:

  • New components:
    • Ammeter (meter)
    • Voltmeter (meter)
  • Undo/redo functionality for placing/moving components
  • Choose resolution when exporting PNG image
  • New logo

Please visit the downloads page to view available downloads.

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Circuit Diagram 0.4 Beta Released

March 16, 2011

New in this release:

  • New components:
    • Microcontroller
    • Potentiometer (option for resistor)
    • Variable resistor (option for resistor)
    • Thermistor (option for resistor)
    • Zener diode (option for diode)
  • Flip certain components
  • Open files from Windows Explorer
  • Modified file format (files from previous versions can still be opened, but previous versions cannot open files created in version 0.4)
  • Fixed capacitance being displayed as pico instead of nano
  • Changed check box for external connection editor text position
  • Certain components cannot be resized

Please visit the downloads page to view available downloads.

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Circuit Diagram 0.3 Beta Released

March 5, 2011

New in this Release:

  • Resize components when in "move" mode
  • New components:
    • External connection (e.g. to label the input or output of a circuit)
    • MOSFET
    • Lamp
  • Ability to flip terminals of Op-Amp
  • Fixed Op-Amp rendering alignment
  • Improved rendering of switch component
  • Added "Documentation" under "Help" menu

Please visit the downloads page to view available downloads.

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Circuit Diagram 0.2 Beta Released

March 2, 2011

New in this Release:

  • New easier selection mode
  • New components:
    • Op Amp
    • NOT Gate
    • XOR Gate
    • Schmitt Trigger NOT Gate
    • Diode
  • Minimum size for components
  • Full implementation of OR, NOR and NAND gates
  • Fixed crash occurring when non-numeric value entered into resistor or capacitor editors
  • Fixed colour being ignored when creating an ellipse while exporting to SVG
  • Fixed text alignment for rail component
  • Changed order of components in tool bar

Please visit the downloads page to view available downloads.

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