Qucs, also known as Quite Universal Circuit Simulator, is a tool that allows you to design integrated circuits in a very schematic way to verify their performance.
It includes an extensive component data base that can be inserted into the circuit. Each one has its respective electronic properties: resistances, voltage sources, diodes, transistors, gates, LEDs, bridges, etc.
Qucs also allows you to calculate the electronic properties of different transmission lines and radio frequencies through a module known as QucsTranscalc. It manually introduces the values of the different parameters to obtain a precise result.
Another similar tool to Qucs is Kicad, although this one is much more developed. It's your choice.
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Install qucs free electronic circuit simulator