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Sorry - adding a little more to my previous reply. Regarding this question: " Could you please tell me how to design RF choke (L2)? " How to physically design it is really off-topic for this group.?

My VCO circuit ran fine yesterday after I changed trtol from 2 to 1, but today it stops early again.? I added ".options trtol=1" to the schematic but that didn't help either. What the heck? I just

abid asked, " Could you please tell me how to design RF choke (L2)? Is it just an inductor? " Yes, a choke is an inductor. But no, an inductor is never just an inductor.? Real inductors (or coils or

Thank you so much Andy! I have uploaded another picture (5.png) in this album /g/LTspice/album?id=295221. Could you please tell me how to design RF choke (L2)? Is it just an inductor?

Donald wrote, " Reminds me of one very early lesson I learned in University EE classes, back in the day when researchers were developing new methods of simulation: amplifiers oscillate; oscillators

Hi. I had to model an old circuit in LTspice24 (needed to recalculate some things) and it didn't work. I had to force TRTOL=1 to make it work. I came to the conclusion that the previous value of

Reminds me of one very early lesson I learned in University EE classes, back in the day when researchers were developing new methods of simulation: amplifiers oscillate; oscillators don't. Donald.

This group is great, and you folks are the best. Andy nailed it. In Settings trtol was set to 2. I changed it to 1 and now my circuit runs perfectly. A bit of explanation if anyone who cares: First, I

Ethan, I can tell that your file "Winer VCO.asc" simulates well without any changes on my LTspice 17.0.37.0 (with the default Modified Trap integration method)

abid, I uploaded " Q(V).zip ( /g/LTspice/files/Temp/Q%28V%29.zip ) " to the Temp folder, with capacitors using the equation for Q(V) that is in the older (2015) paper. Andy

I'm not where I can test on 24.0.12. But it works fine on LTspice 17.0.35.0, with or without uic. I simply unzipped it and ran the sim. Then removed uic and ran it again. worked fine with or without

If the 555 must be AC-coupled to the comparator, I wonder if C2 is just to small? Andy

On 25/05/2024 23:46, Ethan Winer wrote: > I can't tell if the problem with this voltage controlled oscillator is my circuit or LTspice itself. I'm using the current version (X64): 24.0.12. When I

Hmm.? I am not seeing any of the behaviors you described, but maybe a setting changed, which affects it. Check your TRTOL setting.? LTspice used TRTOL=1, until version 24 changed it to 2.? If you

I think there s a design fault, but I can't identify it. However, UIC is not your friend (it usually isn't). It works for nearly 0.5 s without UIC.

I can't tell if the problem with this voltage controlled oscillator is my circuit or LTspice itself. I'm using the current version (X64): 24.0.12. When I change the .tran length the behavior in

john23, The model Tony uploaded comes from the transistor's S-parameters.? S-parameters show the linear behavior of the transistor.? Since it is used in a 675 Watt (DC input) power amp, it is

Tony, I think there may be some misunderstanding about where that "3 ohm resistor" comes from.? There is little consequence to that, but I want to point it out. From earlier messages from john23 --

john23 wrote, " I want to simulate the effect of UCC21220AD_TRANS? floating ground in LTSPICE " I write about this many times, and I thought I did already with you, but many not. The simple answer

Hi. Generally speaking I don't think floating land is necessary. It is possible to calculate circuits without it. But especially for stubborn people I have created a model of floating ground and a