Kuehnel, new book: Circuit Simulation

[PRR]

> corrects p. 28 on p. 32.

Yes. I noted that later, thought I'd posted, but I didn't.

Yes, he wants you to experience the "blow-up", so you learn not to panic, but to work through how SPICE sees the world. I think in an early draft he just told you to limit the "A" to 0.99-0.01.

I see the fix on p32 has gmin in a different place than in the code-snip I posted here. This could keep a math-wizz busy figuring what difference it makes. In practical spice, if your small numbers are anywhere near gmin you are way down in numeric noise already.

[jjasilli]

Partial success with the the next step - modeling the Orange amp James TS.  Had trouble with the Yahoo Group pot, so I used Kuehnel's pot which had to be built from scratch.  Got a proper plot with the Bass Pot at fixed setting.  Re-setting the Bass pot to Variable is giving me a faulty Plot.

[PRR]

Today's spam (I asked for it) from Analog Devices includes a link to:
Get Up and Running with LTspice
https://www.analog.com/en/analog-dialogue/articles/get-up-and-running-with-ltspice.html
https://www.analog.com/media/en/analog-dialogue/volume-53/number-4/get-up-and-running-with-ltspice.pdf
It is scatter-shot of tips, not a real tutorial, but worth a read.

[jjasilli]

Thanks! I previously blundered into some other of Alonso's web postings while googling for help. His stuff is very helpful.  I'm almost done with Kuehnel's Ch 1, except for the transformer simulations; and I read through the entire book on an airplane flight during the Thanksgiving break.  Sometimes when I learn something new in LTspice, I forget something basic; but it's coming together.


The side goal of getting better with all things digital is also improving, despite my intrinsic analog orientation!

[dwinstonwood]

[Sorry for the old thread revival; I didn't want to start a new one.]

Well, I finally got around to working in Kuehnel's book. I successfully modeled a 12AX7 following his steps in ch. 2. The model's values are converted to variables so it can easily be modified into a 12AT7, etc.