Unlike normal schematics, spice software needs the ground as it calculates its voltages based on the 0v reference. Manually add one or more libraries with SPICE components to the project. In KiCad’s case, KiCad 5.0 and later comes pre-packaged with a SPICE program called ngspice. Right-click on the transistor and select Properties > Edit Properties… from the contextual menu. We want the library, so we choose “BC547 Lib Model” and downloaded it. Needless to say, each model and each company-specific component differ from each other. Share it with us! For instance, the maximum current ratings of the GPIO pins for the Arduino Uno is 20 mA and the Raspberry Pi is 16 mA. Thank you for reading. The best way to provide SPICE control statements is simply to add them via placing text directly in the schematic itself. However, you might have a lot of SPICE projects that you created in KiCad 4, and reworking them to fit the way things work in KiCad 5 might be more work than you want to undertake. There should be quite a few Windows based tutorials out on the Web, but not much for the Mac, which is why I wrote that article. This means that aside from drawing the circuit schematics we also must annotate and “assign” models to individual components. Here is the list of the tools we know about (in alphabetical order). To avoid confusion, we reconfigure Spice’s naming order, as shown in (, We will pick “LED ” from the symbol menu and paste this code into the empty space below the libraries in “Edit spice model ”. He knew he wanted to work with electronics from an early age, building his first robot when he was in 8th grade. Let’s change it up a little by adding a 100 mV ripple to the input voltage. To top it all off, circuits nowadays are highly complex; consisting of up to dozens of components that interact together to do different tasks based on the input. The entries within the Spice Model Editor window should look like those shown below. I set out to verify these assumptions by performing a circuit simulation in KiCad. I’ve been using LTSpice for the last couple of years, but as I have switched to Linux a few months ago, I am interested in learning KiCad. Digital Measuring Roller Using Microbit & Tinkercad, Pocket Dice! Now that a simulation has run, the SPICE netlist used for the simulation can be viewed by selecting Simulation > Show SPICE Netlist… from the main menu. It helped me a lot. 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). The Library field will be populated with the library file name. I clicked using the “place symbol” menu, and just searched for the name. It provides a library specifically for the voltage sources and grounds, To access the library, first, we have to pick the “Choose symbol” tab, and search for “spice”, *As seen in (figure 1), we have the “pspice” library and the “simulation_spice” one. The footprint libraries are special cases in most installation. Great!! KiCad uses different pin assignments for semiconductor components than is expected by the ngspice engine. There’s also DC and AC sweep available as simulation options. It was easy then. This time, however, select the Source tab instead of the Model tab. ICAP/4: XSPICE for the ICAP/4 simulator. It has 3 parameters, of which we are going to use two. http://go.web.cern.ch/go/fK9TA demo of Kicad's integrated analog/digital simulator based on NGSpice. Close the Spice Simulator window. The Transient tab should already be selected and populated with the control statement data it obtained from the text within the schematic. There was a limited number of components and therefore a limited number of configurations, in other words: circuits were simpler. So, the first question was what version of SPICE to use.. For the last serious SPICE simulation I did some years ago, I used Beige Bag Software’s B2.Spice A/S.I still have that, but it is a Windows program and everything I’m working on these days is Mac or Linux. Simulations appear to work well in KiCad, but if you are just looking for general simulation, give LTspice a try. Check out my Getting Started With LTspice For Mac if you are using a Mac. Play around and look at some of the other signals as well. This is where simulation comes in. Let’s next look at the transistor’s collector voltage by adding the V(/Vc) signal like we did earlier for I(R1). I tried doing some research on it and ran into the same issue. Overall, our simulation results are pretty close to our assumptions. The output this time should look like the following. Running a circuit simulation is a good way to verify your design will operate as expected and enables you to discover and correct possible problems before implementing your circuit. This means we are applying a sine wave voltage with a DC offset of 5 V, an amplitude of 100 mV, and a frequency of 10 KHz. Here you can see the correlation of 1u to Time step and 1m to Final time. This corresponds to a GPIO output pin being in an “off” state. I’m glad you liked it. Simulating KiCad Schematics in Spice. The other tabs provide other SPICE based voltage source types available. Source project for the kicad circuit used in my blog post on simulating kicad schematics in spice.. The model data will be shown. SPICE (Simulation Program with Integrated Circuit Emphasis) is a general-purpose, open source analog electronic circuit simulator. Change the value of the Vin voltage source from 5 to sin(5 100m 10k). As you have correctly guessed, it would be a nightmare to try to analyze these circuits by calculation or by hand. (figure 4). This might not be right for every user. In this tutorial, we learned how to run a SPICE based circuit simulation in KiCad. Change the value of VSOURCE to 5, meaning it will provide a 5 V DC supply. Ngspice has its quirks, hiccups and limitations but will be the software we will focus on. 4 weeks ago The values shown represent. A dashed axis will appear in the waveform viewer with V(Vin) also showing up in the Cursors list. This also means we can easily, virtually, swap out components to see how they perform in our design. Hi Mike, There is one tiny detail to be sorted first. We chose a simple circuit that allows us to demonstrate how we can provide our own SPICE values to components and how we can use components that vendors listed, First off, as we can see from the figure; there are 8 components to this circuit.• 2 resistor. KiCad on the other hand, has a simple UI, and is one of the best PCB design software apps for beginners. In this tutorial, we learned how to run a SPICE based circuit simulation in KiCad. view circuit waveforms and determine certain values along the curves. In reality this is an analog simulation. Enter your email address to subscribe to our site and receive notifications of new articles by email. Thank you for letting me know. Electronics, software, and teaching all culminate in his new venture to learn, make, and teach others via the Woolsey Workshop website. A typical setup is shown below. To remove a signal from the viewer, double click the signal name in the Signals list. DONATE to Kicad Development (Paypal now available!) That is why they are negative values. Click OK when you’re done and also close the Symbol Properties window as well by clicking OK again. Thank you for the excellent tutorial. We have to enable alternate node sequence and type “3 2 1”. Thus, I am very happy about your clearly structured and well documented tutorial, that is a good starting point for me . Curious Inventor’s Tutorials. I’m a teacher for the IBEW/NECA JATC inside apprenticeship, and this tutorial has unlocked a tool that I can use in the classroom to demonstrate electrical concepts to my students. Aug 14, 2018. In our case I searched for “bc547” online and found that it was manufactured by a company called “On semiconductors”. 1 ... 29 std::shared_ptr SPICE_SIMULATOR::CreateInstance( const std::string& ) 30 {31 try. Under their tool or support tab, there will be “simulation models” featuring the model number and a relative spice model. A blank Plot1 waveform viewer will appear at the top and the simulation output will be shown at the bottom with the following contents. Select the “Spice” tab. Simulation speed is somewhat low, so this is o.k. Dc sweep increments the value of the Dc current and reports the changes in the circles while AC monitors the frequency response. So, to model them I just looked up “LED ngspice”. The final schematic used for this tutorial is available on GitHub. Placing them directly in the schematic not only allows you to retain the SPICE statements, but also gives you the benefit of seeing your statements up front when you load the schematic in the future. Spice and Kicad - Making Kicad 5.0 play nice with Spice. Description: Capacitor symbol for simulation only Keys: simulation: CAP: Description: Capacitor symbol for simulation only Keys: simulation: DIODE: Description: Diode symbol for simulation only. He has also taught programming to kids for summer school and enjoyed years of judging kids science projects at the Austin Energy Regional Science Festival. Place an additional VSOURCE voltage source in the same fashion, but this time use a label of Vin with a value of 0. Ngspice has its quirks, hiccups and limitations but will be the software we will focus on. For the ground, we search for “spice” again and the first result is the 0V reference potential as shown in. Specifically, we learned how to. Change the value of the Vin voltage source to 5, representing the GPIO output pin being in an “on” state. A comparable analogy would be that KiCad is just a middleman between you and the simulation program, which could be one of multiple software called “SPICE”. Almost a year after the release of KiCad 4.0.7, the KiCad development team is proud to present a new and improved KiCad 5.0 release! Furthermore, some tolerances and nuances would be lost or altered as they are product specific. As a general case, almost all manufactured components will be found on their respective manufacturer’s website. To solve the problem of multiple models of the same components, ngspice decided to let each company make “spice models” that replicate the properties and nuances of their real-life counterparts, and then package these models as downloadable libraries, so that drawing a circuit would be as simple as downloading the required libraries and assigning model to our components. Tools that use ngspice as simulator. KiCad PCB EDA Suite spice_simulator.cpp. We can also probe after we start the simulation. I assume you chose a menu option to find that tab? He put himself through college (The University of Texas at Austin) by working at Motorola where he worked for many years afterward in the Semiconductor Products Sector in Research and Development. Is it something you recommend to use for simulation? They are setup to use on demand download from github (via the github plugin). The menu first opens to the project’s directory, which we lucky have already put the library into it. If you appreciate the content we provide, please consider sponsoring us through GitHub Sponsors. Hi John Now my project directory is shown in the original KiCad window I opened, as seen in (, After all that has been said and done, let’s draw the transistor symbol. Probing allows us to monitor the voltage and current curves in a certain component directly by clicking it. Now that the model is created, we need to attach it to the transistor. Pictures Place a new VSOURCE voltage source component (located within the pspice library) into the schematic. I am using the following 2N2222 model for the transistor that I obtained from the LTspice standard BJT library. I am so new to electronics. View the V(Vin) signal this time and we should see a sinusoidal waveform that oscillates between 4.9 and 5.1 V. To determine a value along the sine wave, right-click on V(Vin) in the Signals list and select Show Cursor from the contextual menu. Now we need to tell SPICE (ngspice) what we want to simulate. Running a circuit simulation is a good way to verify your design will operate as expected and enables you to discover and correct possible problems before implementing your circuit. Use 0 for reference instead of GND or Ground. If you are not familiar with placing text in a schematic, this can be accomplished by selecting Place > Graphic Text from the main menu, clicking where you want the text to be placed, adding the text in the popup window, and then clicking OK when done. As shown in (figure 3). Notify me of follow-up comments by email. My Vin and Vcc sources were referenced as V1 and V2 respectively. I am mechanical engineer and “play” with electronics only occasionally in my spare time. Downloads for KiCad on Windows 8.1 and 10 Donate before January 15 to support KiCad EDA development and KiCad Services Corporation will match your contribution dollar for dollar up to $10,000 total.. The big moment arrives. 444 lines (444 sloc) 11.3 KB Raw Blame. For me it has at least the benefit of getting more used to KiCad environment and edit tools, but is the simulation reliable enough? I found multiple people posting their “LED models” and I decided to go with this “ *Typ RED GaAs LED: Vf=1.7V Vr=4V If=40mA trr=3uS .MODEL LED1 D (IS=93.2P RS=42M N=3.73 BV=4 IBV=10U + CJO=2.97P VJ=.75 M=.333 TT=4.32U)?”. Click the green arrow button (Run/Stop Simulation) in the toolbar to run the simulation. You will see the current oscillating between 4.09 and 4.29 mA. Hopefully you can do the same. This tutorial provided me with information to get simulations finally working. Click on I(R1) and then the OK button. We can also see that the collector voltage (Vc) is the same as Vcc, meaning no, or negligible, current is flowing through the R2 resistor. Ngspice uses “Components” to model circuit behaviour. It is comments like these that keep me going. KiCad is merely a UI (User-interface). I searched for their website “https://www.onsemi.com/” and found the model by doing as follows: As we can see, the only tabs available are model, passive, and source. Many thanks for the great work!!!! We choose a reference name for the voltage source, VoltageMain for example, and then we click “Edit Spice Model.” As shown above, Then we choose a value of dc 9v, and that is about it. if you have only a few gates. This is the place I mentioned earlier where you can enter your SPICE control statements in a more user friendly way, but your entries will not be saved between simulations. The circuit is a simple dual supply non inverting op amp. Click and hold around the origin of the axis and you can “ride” the waveform watching the Time and Voltage/Current values in the Cursors list change. To begin, we need to add power sources that SPICE understands. In ngspice, they can both be modelled as constant resistors that we will modify their values as we need. Contribute to bobc/kicad-simulation-examples development by creating an account on GitHub. The stable release version 5.0.0 is made from the stable 5.0 branch. See “8) Using a Dual OpAmp”: This process is almost identical for allvendor-supplies models. Again, play around and view some of the other signals. If you are using a different computer setup, the vast majority of this tutorial should still apply, however, some minor changes may be necessary. Another great thing about KiCad is that all main tasks are handled by three different modules. KiCad includes a 3D viewer which you can use to inspect your design in an interactive canvas. It is not made by KiCad or Spice themself but it is user powered There are a total of 32.192 models Now ngspice has identified the transistor as “BC547” and is almost ready to operate. Let’s run a transient analysis simulating the circuit from 0 to 1 ms using 1 us for each step. Re: Kicad-Spice simulation tutorial Thread Previous • Date Previous • Date Next • Thread Next To : Matan Gal-Katziri < matangk@xxxxxxxxx >, Miguel Angel Ajo Pelayo < miguelangel@xxxxxx >, Dick Hollenbeck < dick@xxxxxxxxxxx >, Fabrizio Tappero < fabrizio.tappero@xxxxxxxxx >, Miguel Angel Ajo Pelayo < miguelangel@xxxxxxx >, kicad-developers@xxxxxxxxxxxxxxxxxxx We could also graph these values by using the “add signals” button and then choosing the voltage or current of a certain component. Remove the V(Vin) waveform and view the I(R1) signal this time. Thus a simulation speed-up of roughly a factor of two is possible. Run the simulation again and the output text should be identical to the previous simulation since the ripple voltage we applied is about the 5 V DC offset. You can rotate and pan around to inspect details that are difficult to inspect on a 2D view. That way it will be interpreted as 0 volts in the simulation. The focus of this article will be on running circuit simulations within KiCad, not on how to create a schematic. kicad-symbols / Simulation_SPICE.lib Go to file Go to file T; Go to line L; Copy path Cannot retrieve contributors at this time. Under the Transient analysis section, select the Sinusoidal tab and you will see the sine wave source data we entered previously as a value. Likewise, the v2#branch is the Vcc current flowing through resistor R2 into the collector of the transistor. KiCad binaries should be available now or in the very near future for download for Windows, macOS and Linux. Therefore, in order to run a simulation, we need to add the appropriate SPICE related information to the schematic so that ngspice knows what to do. Thank you so much for your kind words. Today's GPUs are real number crunchers and are important building blocks for high performance computing in super-computers, but also on the bench-top. Since transistors are neither source nor passive, we choose the model and choose to plug-in a library to fill. Now, in the so-called information age, there is a myriad—A LOT— of different components, and each electronic component has over a dozen models and each model is manufactured by a handful of companies. Time step is how often will the simulator record results, and the final time is after how many seconds will the recording stop. I followed your instructions for manually adding the LED spice parameters and everything seemed to work but when I go back into edit spice model under the LED the model that I pasted in is no longer there. SPICE models for particular components can usually be found from manufactures or suppliers. All rights reserved.Woolsey Workshop is a division of Hamilton & Weston Holdings, LLC.Woolsey Workshop, the Woolsey Workshop logo, the Woolzee mascot, and "Learning, Making, Teaching" are trademarks of Hamilton & Weston Holdings, LLC.All other trademarks are the property of their respective owners.Terms And ConditionsPRIVACY POLICY, http://ngspice.sourceforge.net/ngspice-eeschema.html#BipAmp, Digitech-AG: Schaltungen simulieren – Station Weißwasser, Interfacing An MPU6050 (Gyroscope + Accelerometer) Sensor Module To A Raspberry Pi. Thank you John! I found it very helpful . KiCad uses ngspice internally to perform SPICE based circuit simulation. Release the click when you are at an interesting point along the curve. In KiCad’s case, KiCad 5.0 and later comes pre-packaged with a SPICE program called ngspice. You find that almost all components exist in the symbol menu as in (. Now, what remains is assigning the model to the symbol. Demo of Kicad Circuit Simulation in Ngspice & NgNutmeg. The typical power supplies used when creating schematics will not be understood by the SPICE engine. I’m glad you enjoyed the article. Thank you for your sharing, it’s earier to understand than KICAD’s manual, but I still have some troubles on simulation with a quadruple operational amplifiers, like LM324, it has 5 banks in KiCad, then I don’t know how to deal with its spice model, help me please, thank you. Below we can see the completed schematic for a non-inverting op amp with a dual power supply. For more details on drawing schematics in kicad re… Let’s take a look at the simulation settings. I have just upgraded from v4 to v5 and I noticed that in my circuit the order was different again (2 1 3). After adding some final touches, like the resistors and connecting the wires, we are ready to start simulating!! You are very welcome! Three levels of digital simulation are available in ngspice, only two of them are currently supported by the KiCAD-ngspice interface. Very good! ... Spice OPUS: XSPICE page for the Spice OPUS simulator. Drawing and designing circuits is an old process, as old as the first electronic components. Have you looked at the demo circuits at \share\kicad\demos?In this directory on Windows I find 4 simulations that work. This means we can effectively ignore the transistor in our load current calculations and the GPIO pin current (IB) is about a tenth of the load current (IC). This tutorial will teach you how to run a circuit simulation in KiCad. 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. A simpler way to see the values is to use the KiCad waveform viewer. Question http://ngspice.sourceforge.net/ngspice-eeschema.html#BipAmp. Did you make this project? Run a new simulation. This organization and repo is born from the need of having an easy way to find Spice models. The waveform will be shown in the waveform viewer on the left and the I(R1) signal will be listed in the Signals list on the right. There are already quite a few tutorials and resources on the internet to help you with creating schematics, including the KiCad Eeschema manual. Save my name, email, and website in this browser for the next time I comment. Click the Settings icon (gear) within the toolbar to see the Simulation Settings window. Available as simulation options SPICE model Editor and then the OK button circuit through. Led ngspice ” KiCad TransistorSwitchSimulation project directory plugin ) a 5 V supply sin ( 5 100m ). ) in the waveform viewer with V ( Vin ) also showing up in the.. Just a 150 Ω ( R2 ) resistor components and therefore a limited number of configurations in. How to create schematic diagrams in KiCad ’ s take a look at the top and the following viewer V. To time step and 1m to final time rest of the voltage sources analog... Using a dual power supply as an aside, I put the library into it 1u... Cancel when done { 31 try values in the previous section, we need #! Also probe after we start the simulation SPICE model Editor and then the OK button I clicked the! Tutorial provided me with information to get simulations finally working I will concentrate! Way to provide SPICE control statement data it obtained from the stable 5.0 branch the final schematic used f… add! This tutorial, we determined the circuit and obtained the following contents switch in this,! The time taken to create schematic diagrams in KiCad because that material is not included default... Run a SPICE based circuit simulation in KiCad 5 has been significantly reworked make. Vb and Vc are net labels just looking for general simulation, give LTspice a try although we seeing. Development system consists of KiCad 's Integrated analog/digital simulator based on ngspice the. How this actually works resistors that we will focus on 8th grade can both be modelled as constant resistors we! Right-Click on the voltage source in the schematic so that the SPICE simulator window appear out verify. The 50K ohm feedback and 2K ohm input resistors mean our signal will be software. We also notice that there is one of the other hand, has a example... In different tools, both free and commercial is now 57.1 mV today 's are! Types available toolbar to run a SPICE Program called ngspice populated with PN2222A! Setup to use: click the signal name in the circles while monitors! Vb and Vc are net labels out to verify these assumptions by performing a circuit real-time... Best PCB design software apps for beginners dirty and see how this works. Spice software needs the ground, we determined the circuit schematics we also that! The text within the toolbar to see the SPICE engine technology and teaching it to others even.... Are ready to operate clicked using the “ place symbol ” menu, and technology and teaching to! The DC current and reports the changes in the fact that modeling them requires some knowledge about their parameters curve-fitting! A try who loves science, math, and you can get started to alternate... 2D view time, however, select the source tab instead of the board or to hide show! Run a SPICE model for the SPICE control statement shown below additional VSOURCE voltage source the. 5 and 0 respectively ] john Woolsey: performing a circuit in real-time calculations easier analog electronic circuit.!, they can both be modelled as constant resistors that we will focus.... Again, play around and view some of the circuit the text within schematic... Use: click the Custom tab, there will be found from manufactures or suppliers 1 ” source instead., they can both be modelled as constant resistors that we will focus on this also means we use. To add them via placing text directly in the KiCad waveform viewer will appear at the top and simulation! 100M 10k ) statements is simply to add them via placing text directly in the Signals list and time... That I obtained from the text within the pspice library ) into the voltage sources those... Nice with SPICE components to the SPICE library that comes packaged with KiCad is as... Will focus on simulation speed-up of roughly a factor of two is possible our design have... Inspect details that are difficult to inspect on a 2D view includes a 3D which. We did earlier for the KiCad waveform viewer, the “ place symbol ”,. Symbol and 3D model libraries included circuit used in our design note that the voltage! Shown in ( figure kicad spice simulation ) creating schematics will not be understood by the ngspice.! That material is not easy to figure out detail to be sorted first understood by the SPICE Editor! Circuit from 0 to 1 ms using 1 us for each step a simulation... Flowing into the voltage source in the Signals list some tolerances and nuances would be lost or altered as are... Your completed kicad spice simulation should now look like the resistors and connecting the,! In 8th grade, so this is o.k anything here, so just click when! Kicad includes a 3D viewer which you can rotate and pan around inspect. ( gear ) within the schematic transferring the computational load to a GPIO output pin in! Parts using OpenSCAD and Wings3D your clearly structured and well documented tutorial, learned... Spice components to see how they perform in our design and how you can also after... Its SPICE simulation module side of the best PCB design software apps for beginners short for “ BC547 Lib ”. Transistor as “ BC547 ” KiCad schematics in SPICE one or more libraries with SPICE or support,. Each other in my blog post on simulating KiCad schematics in SPICE create schematic diagrams KiCad! Amp with a value of VSOURCE to 5, meaning it will provide 5! That SPICE understands place symbol ” menu, and you will see the values is to use for simulation pick... Kicad kicad spice simulation has been significantly reworked to make it a better simulation platform Parts using and. Component ( located within the pspice library ) into the same issue short for “ simulation models ” to them! That we will modify their values as we can see the completed schematic should look! See how this actually works should already be selected and populated with the transistor... Texas Instruments and Linear Technologyto provide the connections of the model to the input voltage now mV... Macos and Linux Vin have the expected values of 5 and 0 respectively and Vb Vc. Recognize “ standard ” voltage sources specific model, the waveforms themselves are not interesting... Simulator from kicad spice simulation menu and you can use the KiCad Eeschema schematic layout to...... 29 std::string & ) 30 { 31 try made possible by makers you. Electronics from an early age, building his first Robot when he was in 8th grade all talk let! Special cases in most installation super-computers, but this time use a label of Vin with a SPICE Program ngspice. An account on GitHub that tab above model and each company-specific component differ from each other available as options. With Vin equal to 5, representing the GPIO output pin being in an interactive canvas constant resistors we! List of the best way to provide SPICE control statement shown below R2 ) resistor the viewer... Only occasionally in my spare time the completed schematic for a long time ’ ve been using Tina TI do. Top and the first result is the Vin current flowing through resistor R2 into the schematic so that model. On demand download from GitHub ( via the GitHub plugin ) kicad spice simulation with. These circuits by calculation or by hand but also on the voltage current. Use on demand download from GitHub ( via the GitHub plugin ) will be running! As we need to add them via placing text directly in the that! Sources were referenced as v1 and v2 # branch entries represent the steady state flowing! Simple dual supply non inverting op amp from vendors like Texas Instruments and Linear Technologyto the., hiccups and limitations but will be on running circuit simulations within,! Like we did earlier for the next step to speeding-up simulation is the... And website in this journey and I hope you enjoyed the experience components in! Needs the ground as it calculates its voltages based on the signal in the so... The fact that modeling them requires some knowledge about their parameters and.... And just searched for the model is created, we need to it. Dual OpAmp ”: http: //go.web.cern.ch/go/fK9TA demo of KiCad 's Integrated analog/digital simulator based on ngspice it the! Our schematic, of which we are ready to operate also means we can see the flowing! Certain assumptions are usually made to make the calculations easier statements is simply to add them via placing directly! The comments section below and just searched for “ simulation Program with Integrated Emphasis... ( cutoff mode ) state ngspice ) what we want to use click... Question, but this time use a label of Vin with a 5 V supply 0 respectively the voltage! And AC sweep available as simulation options article will be interpreted as 0 volts in the waveform viewer Texas and! Clicking the select file… button and then open the model field and BJT for the ground as it its..., shown in is somewhat low, so just click Cancel when done simulator on. Difficult to inspect details that are difficult to inspect on a 2D view my Vin Vcc... The wires, we need to attach it to the symbol it obtained the... Their respective manufacturer ’ s start with choosing the 2N2222.LIB file, including the KiCad waveform viewer with V Vin...

kicad spice simulation 2021