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ericsson.sunshine wrote: "About the efficieny, I didn't mean affecting the application of the simulation for, I simply meant the 'spent time' of accomplishing the simulation(s)." That is what I meant

ericsson.sunshine, don't be misled by what you saw in the Help, which (BY COINCIDENCE) has both ".STEP" and "NPN" in the same command line. That one is a very special case of the .STEP command. For

You know, if the computer resource is enough, I think maybe I could build the default of every possible architecture of the circuit topology in a single schematic, though at every single .STEP, mainly

Hi, Andy: Thank you for the answering. About the .STEP & .MODEL 1 NPN(...) , may I ask if there is any example already ? I could understand the '.MODEL1 NPN(...)' syntax in standard.bjt, but I don't

Hello, There is a new version of MAC-LTspice. The FFT is working again. Please update. Control Panel -> Operation -> Software Update Best regards, Helmut

Hello eT, Thanks a lot for correcting this model. Could you please make a new folder "CD4047 new" in the hyperlinked Files-section below and upload your zip-file in this new folder.If you have any

very thanks Andy

Hi I've uploaded a CD4047B circuit (originally downloaded from this groups files section) with some adjustments to the symbol attributes. Some attributes were incorrect and would produce errors. eT

Hello John, Yes I have used the default SPICE-settings in the Control Panel. What we get is a discharge with the R*C time constant of 100ns. The average is 20uV. The low value is about 12uV, but this

It's your _pulse charge accumulation.asc completely unchanged, and LTspiceXVII is at all default settings Best wishes John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk

Hello John, Please upload your schematic wich shows bad results in your opinion. Best regards, Helmut

I don't want to spread the problem all over the list. I sent Helmut a screenshot by private email, and you can have it too, if you want. Best wishes John Woodgate OOO-Own Opinions Only J M Woodgate

I have not said that Helmut is wrong, but if you don't set N and simulate for longer, even with .plotwinsize=0, you (or at least I ) get very strange results. Best wishes John Woodgate OOO-Own

I meant to say, Helmut is correct about the original problem that Eamon had. It's not clear to me what's happening with John's case with 400 pulses. Narrowing the Maximum Timestep does help, somewhat.

Helmut is correct. The unexpected behavior is due to LTspice's waveform viewer trying to "connect the dots" using curves, and when it does that, the trace appears to go negative. If you take the

Hi Andy, Thanks again. I think I did that so far on the mc34072 and it worked. Best regards, Eric Sent from my Huawei Mobile

Eric wrote: "I'm not sure how the symbols on the sym directory will be able to locate their matching .lib models in the sub directory." By filename. If a symbol is supposed to automatically include a

goy123t wrote, "anybody can explain to me what's it?" It's an LTspice schematic! That is what the schematic's file actually looks like. You just opened it in the wrong program (a text editor instead

goy123t, your waveform was not very sinusoidal, so it was no surprise that the FFT came out badly. Always use a whole integer number of cycles. Imagine doing this: Take your simulated waveform, and

Hello John, I think the simulation is precise. The measured average value is 20.182uV whereas the ideal value would be 20uV. The pulsewidth is effectively 2fs due to its 1fs rise time, 1fs wdth and