The Constructor program makes the creation, testing, trouble-shooting, teaching and printing of electrical ladder diagrams, schematics and one line diagrams fast and easy. This program is unique in its ability to test an electrical circuit. You can see the power flow in the diagram and hear the sound effects when a motor or siren is energized. Hear up to 20 different sounds at once. An optional additional sound library allows you to add 126 more sound effects to your diagrams. Your complete circuit can be tested from the three phase power components to the control circuit. The built-in symbol libraries of over 900 symbols makes the creation of your diagrams fast and easy. Diagrams of over 300 rungs may be created. The built-in symbol editor allows you to create your own custom symbols. Once designed, any circuit can then be virtually energized and operated on your computer monitor. The circuit will perform the same as a hard wired electrical circuit. Diagrams may be exported as a PDF or DXF file.