![]() This tutorial will teach you how to run a circuit simulation in KiCad. A basic understanding of electronics is expected along with knowing how to create schematic diagrams in KiCad. The focus of this article will be on running circuit simulations within KiCad, not on how to create a schematic. There are already quite a few tutorials and resources on the internet to help you with creating schematics, including the KiCad Eeschema manual. I will instead concentrate on how to set up and run simulations in KiCad because that material is not as readily available. #QUCS TRANSIENT SIMULATION TUTORIAL HOW TO# The resources created for this tutorial are available on GitHub for your reference. Linux, macOS, Or Windows Based Computer.Sometimes a BJT transistor is used as a switch to drive higher loads (current) than is typically capable from a microcontroller’s GPIO output pins. Schematic Diagram Of Transistor Switch Circuit For instance, the maximum current ratings of the GPIO pins for the Arduino Uno is 20 mA and the Raspberry Pi is 16 mA. Qucs 0.0.8 was the first release to include digi- tal simulation. Adding performance analysis in the digital domain makes Qucs a truly universal simulator. 1.1 QUCS Getting Started Tutorial Part 1 - DC and Transient Analysis 1.2 QUCS Demo Tutorial Part 2 - DC and Transient Simulation 1.3. This involves operating the transistor in saturation mode, i.e., V E V C for NPN and V E > V B < V C for PNP transistors. Introduction One of the primary aims of the Qucs project is the development of a universal circuit simulator that allows circuit performance to be investigated from DC to microwave frequencies. When a typical BJT transistor is operating as a switch in this mode, certain assumptions are usually made to make the calculations easier. This means we can effectively ignore the transistor in our load current calculations and the GPIO pin current (I B) is about a tenth of the load current (I C). As a simple example, let’s say the load is just a 150 Ω resistor with a 5 V supply. ![]() The assumptions imply the load current will be about 33.3 mA (5 / 150) and the GPIO pin current will be about 3.33 mA (33.3 / 10). I set out to verify these assumptions by performing a circuit simulation in KiCad.
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