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The following items have been updated in the Files area of the [email protected] group. /z_yahoo/adventures with loadflow/Usergroup_Three_Phase_Transformer.zip By: Friedrich Schmidt <friedrichschmidt1960@...> Description: Three phase transformer subcircuit and hierarchical circuit Nonlinear magnetic core, Remanent flux, iron lost and copper lost, Leakage

All, I replaced my "Pease MFB BP filter (2).zip" so that it includes the missing UniversalOpAmp1.lib file and created this topic to track it. Tim

Hello everyone! I'm building a PWM control circuit for my single-phase inverter. I started by creating the control stage using a triangular wave source (Vp) and a DC source (Vc). I included an inverting op-amp to invert the triangular wave, and the buffer at the comparator’s output is meant to isolate the signal. After completing the setup, I tested it and noticed that the output from my comparator was a triangular waveform with a peak-to-peak voltage in the megavolt range, which is obviously incorrect. Then I imported my inverter circuit and connected it to the comparator’s output to see if anything would change, but it still doesn't work properly. Could someone help me figure out where I might be going wrong? Could it be that the generic op-amp I'm using isn't suitable for this circuit and I should use a different model? If so, which one? I will upload my .asc file named invmono_controle to the library. Feel free to test it. Thank you!

I have uploaded the above as a .ZIP. According to Bob Pease, the gain at the peak should be close to 34 dB, independent of the tuned frequency. I don't get either of those results using version 24.1.8. However, the bandwidth is fairly constant with frequency, as predicted. I can't believe Bob Pease reported the performance in error. -- Best wishes John Woodgate RAYLEIGH Essex OOO-Own Opinions Only www.woodjohn.uk If something is true: * as far as we know - it's science *for certain - it's mathematics *unquestionably - it's religion Virus-free.www.avg.com

Hi, I try to simulate a testofon, but it doesn't work. Has anyone an idea, why? /g/LTspice/files/Temp/Testofon.zip -- Klaus

The following items have been added to the Files area of the [email protected] group. /Temp/Pease MFB BP filter (2).zip By: Tim Hutcheson <thutcheson@...> Description: Pease Filter with an OpAmp.sub that wraps the UniversalOpAmp device for easy substitution by name for any pincompatible opamp (I think). :-)

The following items have been added to the Files area of the [email protected] group. /Temp/Pease MFB BP filter with UnivOpAmp2.zip By: Andy I <AI.egrps+io@...> Description: Pease tuneable MFB band-pass filter, with UniversalOpAmp2 instead of LM4562, and OUT net moved to the right place

Hi all, I'm toying with an OpAmp design that ultimately shall amplify and clip a sinusoidal voltage (100Vp, 100kHz, 10x Amplification), nothing special except the slew rates are quite high. Now, to verify the functionality that comes _after_ the OpAmp, I've used a behavioural voltage source that I would expect performs exactly the function I want: limit(10 * V(Vin), 0, 10). However, when looking at the simulation, I see that the behavioural voltage source starts to rise _before_ V(in) crosses zero. I would post an image, but cannot. What causes this behaviour? Can it be fixed? My Version of LTSpice is 17.1.5 for MacOSX. Thanks a lot for your input and cheers, Joerg Here is the a

Hi, my name is Ben and I was looking for the 3pin POT model in your database. I found this link: http://www.emwonder.com/spicemodels/ . But I cannot open it. Can anyone help me? thank you already. -Ben

Hi! I am a LTSpice novice who is looking to simulate a CD4009 chip for a linear application. Specifically, in the electronotes newsletter #111, it is hinted that these can be used to make a simple VCA. My very naive approach has been to just copy down the arrangement of NMOS and PMOS shown on the CD4009 datasheet as shown, without tweaking any parameters or selecting "pick new transistor". The circuit I am trying to simulate seems to qualitatively do what it is supposed to after some tweaking, but with the RC values and and supply voltage as shown in the original schematic, it does not achieve nearly the performance claimed. I am wondering if there is any way to select NMOS and PMOS parameters to improve my simulation's accuracy to the actual CD4009. Any help is much appreciated! see files: Eli_R_CD4009_VCA_Question.asc and photo album Eli_R_CD4009_VCA_Question datasheet: https://www.ti.com/lit/ds/symlink/cd4010b.pdf?ts=1746999393252 [Moderator's note: The original Subject said "CD4007", but the body of the message refers only to "CD4009". I have modified the Subject line to suggest the CD4009.]

Hi all - quick bedtime question - I need to plot the group delay of a circuit multiplied by the frequency. Too tired to work out how to do it, nothing I've tried has worked. Is there a natty little trick in the plot window? Thanks -- K

Hi , I am trying to model the Ep10 core with T38 material from TDK micronas I have modelled the core but I am not sure whether it is correct or not ? How do I check my model ? Also it would be good if you could tell me if there are any pre defined core models for this THanks

Here is an initial circuit draft of a crystal oscillator : ck_osc.zip I have so far checked the circuit operating points according to the circuit requirements. However, it just does not start to oscillate. I am a circuit beginner noob, please feel free to point out mistakes and guide me to solve the oscillation startup issue.

Hello all! I'm trying to design a circuit for my college project. My load is purely resistive, so in theory, the waveform I should see across the resistor will be square-shaped with the same RMS voltage as the supply voltage (Vcc) of the circuit. However, when I simulate my circuit, the waveforms appear distorted and noisy. Could someone check if there's something wrong with my circuit or suggest any ideas? I suspect that I'm also configuring my PWM sources incorrectly, maybe messing up the dead time... it's all a bit confusing. You can find the schematic through the link below. Thank you! [Link to off-site file on Google drive removed] [Mod note: Never point us to off-site storage. Upload your schematic to this group's Files area.]

Are there any files, messages etc, that detail how to plot the IP3 of an rf amplifier using LTspice? I would be interested in comments and examples on this subject.

I'm creating some subcircuits and would like to use some parameters of a model in further expressions, but only have to define the value once in the model itself. Is this possible in LTSpice? For example can I use the saturation current of a particular transistor model in a subsequent expression? eg: * define a model with some parameters .model npnmodel npn(is=1e-16 n=1.02) * access one of the parameters in an expression somehow to calculate a derived value * - the actual expression will be more complicated than just *2 .param val = {npnmodel(is)*2}

I am not sure whether some of my libs got corrupted, but with the latest LTspice release and its stronger syntax check ie. the Bordodynov lib shoots huge number of errors which must be corrected otherwise the simulation does not start. Usually errors are with TABLE syntax, but with typos as well (well, quite huge amount). Any experience with that here?

Your inductor/transformer inductances are probably too low. 11?H is only 2 ohms at 30 kHz. How did you calculate them? Try 10 times higher values. You didn't mention the error messages about the .MEAS statements. There are probably other things wrong. On 2025-05-06 17:52, arhamishtiaq42 via groups.io wrote: -- Best wishes John Woodgate RAYLEIGH Essex OOO-Own Opinions Only www.woodjohn.uk If something is true: * as far as we know - it's science *for certain - it's mathematics *unquestionably - it's religion Virus-free.www.avg.com

As part of my studies, I have to simulate a single-phase modular multilevel converter MMC (3-level) on Ltspice. I have already connected the circuit with two voltage sources of 20V each, two submodules (one upper and one lower). In the simulation I work with sine PWM, for this I have also used two carrier signals. The output voltage should be a stepped voltage between +20V and -20V and after the LC filter should be a clean sinusoidal voltage. But somehow I am not getting the desired results. (clean signals). Can someone help me. Thank you.

Power Electronics News just published this article: A Conversation with Mike Engelhardt on QSPICE Read it here: https://www.powerelectronicsnews.com/a-conversation-with-mike-engelhardt-on-qspice/ As you know, this group is not for QSPICE discussions. Andy