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Quite interesting. Me, I tended to use one of LTspice's built-in Digital devices (diffschmitt, etc.) when needing a generic comparator, but they have disadvantages.? Yours is simpler and in many ways

Very helpful. It would be good to add a .ZIP of all the files to the folder.

All LTspice users should be familiar with UniversalOpamps. There are 7 different UniversalOpAmp models of increasing complexity capable of modelling almost any proprietary opamp to reasonable levels

Hi Andy Thank you so much for your help! I've used the "UniversalOpAmp2" and It's working now. Thanks for your other advices too.

I already mentioned that, but I guess it didn't get noticed. -- Regards, Tony

Tim, If? you want a hint about why your schematic doesn't work, I strongly recommend reading in LTspice's Help about the ".inc" and ".lib" commands. (LTspice? > Dot Commands > .INCLUDE -- Include

I have renamed your file to "Pease MFB BP filter (Tim Hutcheson).zip". The other name ("Pease MFB BP filter (2).zip") was a rather bad choice for a file that would coexist with John Woodgate's

Why would you go to all that trouble?? Just do this: * Delete the old LM4562 symbol * Add a UniversalOpAmp* symbol where the other one was * Optionally, delete the old ".lib LM4562_NS.sub" command It

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 *[Moderator's note: The filename has been changed to

Here's another suggestion, if I may add one. When using numbers such as ".008", don't write them that way.? Writing a number with a leading decimal point can lead to mistakes when someone else looks

I wrote: I'm somewhat incorrect, in my explanation.? It is not the finite slew-rate that limits their output voltages.? It is the finite open-loop voltage gain, which defaults to Aol=100K.? They

Why is that obviously incorrect? The ideal op-amps you used have no power supplies, and they are capable of driving infinite voltages, both positive and negative.? If that is not what you wanted,

John, I may have UniversalOpAmp.lib left from an earlier install. but that's the way my use of the UniversalOpAmp from the LTspice menu I think it gets satisfied by my search path but here's the file

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

What I wrote:/This sub-circuit name is not defined.X1 3 2 8 4 1 UniversalOpAmp /was copied from the Spice output log. -- This email has been checked for viruses by AVG antivirus software. www.avg.com

I looks like the level1 reference is being satified by the reference to UniversalOpAmp1.lib, which contains level1.? I created this by placing the UniversalOpAmp from the LTspice opamp menu and then

It's a very great measuring device. It converts a resistance to a frequency. R10 is a simulates resistance between the test tips. R7 is the speaker. With a testofon you can measure on a simple and

Be careful using a file named "opamp.sub" and a .subckt named "opamp". These names are already used in the default LTspice installation - see "opamp" symbol in the the Component Chooser (F2). --

That's not the problem. You have not called for .lib UniversalOpAmp1.lib on your schematic. -- This email has been checked for viruses by AVG antivirus software. www.avg.com

There is no .subckt named "universalopamp". It's called "level1". -- Regards, Tony