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Hi Andy, thank you, it looks like the solution to the issue! :)

You have the mind of an ADI engineer. Indeed, it does not work when using an external editor :--) -marcel

It depends how you measure inductance. A real inductor has series resistance (copper loss) and parallel resistance (iron loss).? You can measure in two ways? - as a series RL network and as a

Jerry, What causes a transformers inductance to decrease with increasing frequency? It sounds like my model of how audio transformers work is too simple. -- Gavrik wrote:

marcel asked, " Is it possible to use parameters and functions defined on the schematic (not in plot.defs) in the waveform viewer? " I do not believe you can.? If there is some ability to do that, it

The only issue I see with that is that it doesn't take into account the fact taht inductance decreases as frequency increases. The ratio is typically 4:1 between 20Hz and 20kHz. So using the LF

You're right. Changes to plot.defs are now immediately effective in 17.1.9. When this happened - I don't know, either. The lack of a mention in the ChangeLog is maybe because hardly anyone even knows

I can answer my own question: editing the plot.defs file *immediately* has effect. (I reran the simulation before trying but did not restart LTspice.) Why don't they document these useful

Is it possible to use parameters and functions defined on the schematic (not in plot.defs) in the waveform viewer? Related, is it possible to use such parameters / functions in measurements, even when

Many thanks, guys.

What was the need for it, perhaps an alternative can be found. I think mousing over them is all you can do.

Automatically assigned node numbers are ephemeral between runs, unless you label them. Giving the same label to different nets, shorts those nets together. I use it often. Giving more than one label

Tony, That is exactly what I was saying (or meant). Andy

George, I don't think this can be called a bug.? Be aware that SPICE's (and LTspice's) netlist syntax is not free-form and we are not free to use functions anywhere we want to.? There are syntax

* Run LTspice * Open Help (press F1, or go to Help > Help) * Open the Contents * Go to F.A.Q. > Simulating Transformers To simulate any transformers in SPICE or LTspice using this linear transformer

The following formula can be used to calculate the dynamic resistance of a spark gap: R = R0 * (1 - exp(-t / tau)) where: R is the dynamic resistance of the spark gap at time t R0 is the initial

Thanks so much guys.

For those who are interested in modelling tube amplifiers and the output transformers used:?I have a thread on DIYaudio? with easy to use LTspice transformer models.

I realized it pretty quickly and remedied the problem.

This is a suspended thread, but I am now able to look at the proposed tutorial The first question is, what sort(s) of transformer? While the basic theory is the same for all, the practical design