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SPICE modelling Update

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I have not worked on my SPICE modelling program for a few weeks now.
I have been spending time on my Big Radio Project.

Now that is completed I can return to my SPICE modelling program.
When last I posted I mentioned that I have run across the models of Adrian Immler and that I wanted to evaluate them and get them into my program. They look like very good models, assuming you can extact parameters for them that will fit your data.

I have not been able to do that very well programmatically. His models do not reduce into simple explicit equations of independant variables. Which is fine for SPICE, a SPICE engine is meant to handle that.

But it is not fine for the non linear regression I want to do to extract model parameters. I have tried every trick and simplification I know, and I can get things to work not too badly for small amounts of data, but I am really not satisfied with it. I have put in the ability to plot the results of the model against the measured data so the user can interactively change the parameter values and see the results. This may be the only way to get a good fit to the data for the Immler models. But it doesnt allow the automated parameter extraction and model comparison that the program is intended to do.

The other thing to do of course is use the models provided by Adrian Immler.

So why not just release the program as it is now, with the understanding that the Immler models are not automated ? Because there are other things I need to clean up. As it is now it is just something I use, I need to clean up the menus, and remove things that dont work, or features I started to add but didnt finish etc.

I have set a target of Sept 1 to finish this program.
Oh, I forgot to say what yeare. OK, Sept 1 2020.

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Return to Bob’s House of Stories

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I have not posted to my blog, or even looked at it, for quite some time. ( February 24 in fact)

It may be that I prefer doing things to writing about doing things, or it may be just laziness.

My main focus prior to abandoning my blog was on SPICE modelling. In my next post I will go into more detail about the problems I am having on that front.

And in the the post after that I will talk about my Big Radio project, which illustrates what I meant about doing things rather thatn writing about things.

I know everybody has to find a way to prioritize and get things done. I am certainly not the only one who cant seem to find enough hours in a day. For some time I have my house cleaning with a check list I stick on my refrigerator. By following this schedule I keep my house from turning into some sort of slum dwelling. It really works for me.

I think I will make a similar schedule or check list of things to do each day or each week : blog writing work, radio project work, SPICE modelling program work, chess practice work, exercise work, golf practice work, project Euler work, armchair philosophising work, etc.

Now I just need to schedule some time to make a schedule.

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Delays to SPICE Modelling posts

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I has been some time since I have posted anything in my series of SPICE modelling stories. There are two reasons. I have taken some time to look over the triode and the pentode models of Adrian Immler. I have been successful in updating my program to do parameter extractions for Immler’s triode model. His pentode model is giving me a little bit more trouble. I need to do a bit more work. The second reason is that I have switched from using FreePascal and the Lazarus IDE, and am now using Embarcadero Delphi. They are both Pascal at heart, so the change was not difficult, but it did take some time. I hope to be able to make a post about Immler’s models soon.

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From the Get Go

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This is just a random thought, somewhat frivolous, or may be not.

I was thinking about the expression “right from the get go” meaning right from the start. Where did that expression come from ? Maybe it comes from the starters instructions given at the start of a race “Get Ready, Get Set, Go !”.

Maybe one day someone said “Get Ready, Get Set, Get Go !” by mistake. And so we now say ‘From the Get Go’ to mean from the start of something.

But that is referring to the start of the active phase of the race, what about the planning phase, what about the Get Ready and Get Set stages ? If we really want to talk about the very beginning of something should we not say “right from the get ready” ?

I think I might start doing that. Maybe I should have been doing it right from the get go.
OOPS, old habits are hard to break. I meant right from the get ready.