
RTL gates were used in early integrated circuits. Unlike simple diode logic gates (which do not have a gain element), RTL gates can be cascaded indefinitely to produce more complex logic functions.

The simplest family of logic gates using bipolar transistors is called resistor-transistor logic (RTL). "To build a functionally complete logic system, relays, valves (vacuum tubes), or transistors can be used.

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Systems made up of more than just electrical connections are also a good fit for the software. Connections are automatically routed at 90 degree angles and are easy to drag around. Libraries of common symbols are also included, along with the IEC 60617 standardized symbols.īeing a schematic editor, QElectroTech does a good job of drawing clean connections between components. It consists of two tools: an element editor for creating schematic symbols and a diagram editor for creating your drawings. QElectroTech is an open source tool for drawing these types of diagrams. Often these are created in Microsoft’s Visio, which is neither open source nor well suited for the task. However, there’s been limited options for creating wiring diagrams. KiCad and Fritzing are two that will take you from schematic capture to PCB layout.

There’s a few open source options out there for creating electrical schematics.
