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Thank you 😊

thanks was struggling to get first sim working and this was the key

How to simulate transistor with ic 7812 ?

I recommend against using this circuit in real life but if you do, this version is a good one to use if you have the parts needed. The thresholds on HC parts can vary a lot so the timing will not be the same for rising and falling inputs. Doing 2 stages with the 2nd delay having an inverted signal partly compensates for this. Adding just the right value of inductor in series with the resistor can also help to get the timings more repeatable. Still don't do it in real life if you have another option.

Very helpful video, thank you!

Awesome !

This is an excellent series of introductory videos for doing simulation in KiCad. I need to get my feet wet, so to speak, and you have given me the tools to do so!

I have been following your tutorials. Thank you for posting them! When I get to the transient simulation in this tutorial it throws the following error: Error on line 0 : a.xu1.x_s1.as_s1 %gd xu1.n2992267 xu1.clamp %gd xu1.n2992267 xu1.clamp xu1.x_s1:a_s1 MIF-ERROR - unable to find definition of model xu1.x_s1:a_s1 Error: circuit not parsed. Error: vector time not found! Error: vector time not found! As I am new to using this tool, I am at a loss. What am I missing? (KiCad 8 on Ubuntu 22.04) Thanks again.

your tutorial is insane, great explanation

I want to add DC 12 V to my schematic but after added it it dose not have a simulation model, how can I add a 12V dc sores to my schematic

Very good, we are waiting for the rest of the tutorial.... Thank you.

ruclips.net/video/_OrjdUVnkdg/видео.html KiCAD and SPICE simulations GUIDE

Excellent! Liked and subscribed. Please continue with the series. It is invaluable for beginners.

This is excellent!

Such a great tutorial, really appreciated this

hey, thanks for this series. I tried this with the opamp OPA 1602. But the Kicad 8 implemented opamp symbol has not pins for vcc and vee (it has just 3 pins 1=out,2=(-),3=(+)), but in that pineditor text the power supply where mentioned (.SUBCKT OPA160x IN+ IN- VCC VEE OUT ). So i guessed I just follow that text file with the pin editing: (pin1=out,pin2=(-),pin3=(+),pin4=(V-),pin5=(V+)). I even edited the symbol and added Pin 4 and 8 for VEE and VCC. But nothing worked. A Video how to get a OPA1602 or 1678 working would be much appreciated!!! thank you

what simulation models did you use for the gates?

Hi Holger, how to convert the inputs and outputs of the digital parts then into near-real-life values with input thresholds and output voltages? Is there a handy mechanism for then transition into analog simulation again?

Thanks for a great series of videos! It has the right pace and right level of detail. 🎉🎉🎉

Awesome series for refreshing my memory on SPICE and also making it practical with the great KiCad tools you show. Thank you!

doesn't work 😔 Error: there is no circuit loaded. Warning: Nesting of subcircuits with parameters is only marginally supported! warning, can't find model 1prebar Circuit: KiCad schematic Too few parameters for subcircuit type "74hc74" (instance: xxua) Too few parameters for subcircuit type "74hc74" (instance: xxub) Same problem at a 74HC02 project. Here is a little bug with the pin-nr's: Xnand1 2 2 1 74HC02 But that is not the main problem. Version: 8.0.1-8.0.1-0~ubuntu20.04.1, release build ngspice: 42 Compiler: GCC 9.4.0 with C++ ABI 1013

Can you do a C integration tutorial please? See here: ngspice.sourceforge.io/docs/others/c-process-CoSim.pdf

Thank you very much. Your Videos have been very resourceful to me

Thank you

Thanks you saved my Day

*Abstract* This video tutorial demonstrates how to simulate an audio amplifier circuit using the OPA1641 operational amplifier in KiCad 8 [edited] and NGspice. Key concepts and steps covered in the video include: * *Circuit Design:* Creating a schematic for an inverting amplifier configuration with a gain of 10. * *Component Selection:* Choosing resistors, power supplies, and an input voltage source with appropriate values * *Obtaining Spice Model:* Downloading the OPA1641 Spice model from the Texas Instruments website. * *Model Integration:* Attaching the downloaded spice model to the OPA1641 symbol in the schematic. * *Pin Mapping:* Correctly mapping model pins to symbol pins for accurate simulation. * *Simulations:* Performing both transient and AC simulations to analyze the amplifier's time-domain response and frequency response. *Summary* * *0:00* Create a new KiCad project and name it appropriately. * *0:35* Find, select, and place the OPA 1641 amplifier symbol in the workspace. * *1:43* Add resistors, ground, and power supply symbols to the project. * *2:33* Add necessary power symbols (VCC and VRE). * *3:19* Add labels for input (in) and output (out). * *3:53* Connect power supplies to amplifier. * *5:11* Assign values to power supplies (+15v, -15v) and resistors (10k and 100k for amplification factor of 10). * *5:40* Add input voltage using the Vsin (sinusoidal input symbol). * *6:19* Configure Vsin with DC=0, Amplitude=0.1, Frequency=1khz and set the AC tag to 1 for AC simulation. *Finding and Integrating the Spice Model* * *6:55* TI provides the necessary spice model. Search on their website, download, and extract. * *8:19* Examine the `.lib` file to confirm it contains the OPA 1641 subcircuit model. * *9:14* Save the `.lib` file within the project directory. * *9:45* Attach the model to the OPA 1641 symbol in KiCad. * *10:30* Be aware: Pin layouts in the spice model might not match the symbol. Adjust pin mappings carefully within the model editor. *Setting Up and Running Simulations* * *12:57* Start with a Transient simulation * *13:15* Set appropriate time resolution and final time (example: 10us and 10ms) * *13:36* Mark the in and out voltages for plotting. * *13:44* Run the simulation. Verify the input amplitude of 0.1 and expected output indicating amplification by a factor of 10. * *14:16* Set up an AC Simulation * *14:29* 10 points per decade. Start frequency 10 Hz, end frequency 10 MHz * *14:53* Select the output to observe the gain/phase response. * *15:07* Run the AC simulation. Observe the frequency response. *Saving Your Work* * *15:50* Save the simulation setup for future use. * *16:14* Save the circuit diagram. Disclaimer: I used gemini advanced 1.0 (2024.03.04) to summarize the youtube video transcript. This method may make mistakes in recognizing words

Can you explain about FFT? The pure sinusoidal 1khz/1V source, with 100ns timestep and 100ms samples... the graph appears to not have enough samples. In LTspice I use the options plotwinsize=0 and numdgt=24 to improve the graph a lot, but in ngspice I don't know how to apply this, can you help? Thanks!

nice, thx !

Great! You have a new sub. Good content

This is very useful for newcamers like. Please continue this series!

Very concise. Perfect.

The only reason this circuit oscillates is because of the variance of tolerances of the components. If you pair the transistors and capacitors and resistors it won't oscillate unless you take a wire and short a couple of legs of the transistors for a split second. (or discharge one capacitor and charge the other) This is a sample circuit in electronics training. In that one, an LED is placed above the collector of the transistors. This simulation might have a random variable in the algorithm to resemble the variances in component manufacturing. TinkerCad is another simulation online.

Beginning to use this and it is quite nice! Understanding ngspice syntax is a bonus so I am beginning to study the docs now. Regarding spice model for a custom element. I try using the PARAMS: keyword to make the parameters available in Kicad. It works but I get an error in the beginning of the log. Cannot find the model it says for each parameter. For future it would be better to have the spice model file in the actual element itself and make the box editable…. One less file to keep track of. Thanks for all great work!

How could one learn on their own that to get a better representation for certain simulations they can change an integration method from "trap" to "gear" (both terms I have no clue about)? Would you just have to get really lucky in a google search?

Thank you for sharing 8 is another step in the FOSS community getting to a full fledged production software

Thanks for the video and I’m looking forward to more videos you make on Kicad 8. I found it was easy to follow for a complete novice to Kicad 8 like me.

Thank you so much for showing how to use ngspice with KiCad 8. It's also great that we can mix analog and digital. I would recommend reading the app note "Implications of Slow or Floating CMOS Inputs (Rev. E)" when using HC logic with more than 0.1μs input rise times.

Thank you for creating this channel :)

Great content. Thanks

Keep it simple and under 20 minutes and your ch will boost ! Great content .

Thank you for these videos. They are going to be useful for me as I intend to explore using the analogue simulation in Kicad. Great job, just the right pace, not going to deep and not assuming to much prior knowledge. I just binge watched the videos and I am looking forward to any further videos you have time to produce.

This is one of my goto Op Amps so great to see a simple Spice simulation and with KiCad8. Thank you!

Thanks for the video. It might be nicer to use keyboard shortcuts to speed things up a little.

Another question that is less offtopic, how does the models know where ground and power is since you never defined it?, I know that they dont need it, but still, how do they know?, how can they tell that I plugged 7 or 14 at the right place?

dumb question, is it possible for me to edit the schematic of a symbol or footprint, then I could theoretically do the AND gate with nmos and pmos myself and just copy paste from there. Then I would have the subcircuit schematic and simulation of whichever model I wanted. The reason why I ask this is because I wanted to simulate the cd4081 in kicad, but it seems everywhere I look the spice syntax is not compatible with ngspice leaving me with a lot of frustration. Also the naming is confusing 74HC10 is not really a 74HC10 but a NAND(3) gate, they could just mention that instead of false advertising they have the complete package. And that is work to the reader.

Great and detailed walkthrough, thanks!