Re: spice models

Hi,

thank you for the input.

> I found this very helpful page:
> >  http://www.brorson.com/gEDA/SPICE/t1.html
>    
> Actually, I find that page to be rather confusing.  I understand
> why you are confused.
>    
At least that page told me which of the 30 attributes from the dropdown 
are actually needed and what they should be. It appears that gEDA has 
little users and thus little tutorials/howto's or the other way round? 
At least for me its pretty difficult to get started for a free-time project.

> I recommend trying NGSpice.
>    
I did. It build the netlist and simulates without error. But the results 
are not what I expect and are wrong (since I know what the circuit does 
in reality). What I did is vary the resistance R1 that will change the 
output current, since there are always 1.25 V dropping over it.

> As far as I know, no gEDA symbols include simulation models.
>    
Hmm... Maybe this should be communicated to new users. I was very happy 
to find the LM317 in gschem until I found out that it does not simulate. 
But then ...
> It would be nice
> if we could provide that too, but it's a lot of work, and we
> lack the manpower to do it.
>    

Next thing I will try is to simulate a circuit with TLC227 opamps that I 
got from spicelib. Will  report my success or failure here :)  Might 
take a while tough. The current source is already working on my 
breadboard, so maybe I can skip it.