Re: gEDA-user: A little puzzled about the purpose of gschem

[timecop <timecop@xxxxxxxxx>]

I think you use it for, you know, schematic entry when you're actually
like, you know, designing a PCB.

-tc

On Thu, Apr 22, 2010 at 2:26 PM, Madhusudan Singh
<singh.madhusudan@xxxxxxxxx> wrote:
>   Hello,
>
>   I am not new (though a tad rusty) to spice, or the usual design
>   process. Years ago, I went through an analog circuit design, followed
>   by a VLSI design class that involved the use of H-Spice, Mentor
>   Graphics and Cadence software, basically Design Architect, (Modelsim
>   for digital design), Accusim, IC Station, DRC, LVS workflow, with the
>   (IIRC) AMI05 library.
>
>   I am finding myself in need of doing some circuit design for a lab
>   application, and without access to the aforementioned software and
>   having developed a slight preference for the faster GUI based work (as
>   opposed to using MacSpice - I am on Mac OSX where geda, pcb, etc. are
>   all installed using MacPorts, and seem to launch ok), I decided to give
>   geda a spin. The overall workflow looks superficially similar to the
>   one I outlined above.
>
>   So, I fire up gschem and decide to test it with a rudimentary inverting
>   op amp circuit using a 741. I wire the net, and then discover I need to
>   use command line gnetlist to generate the actual spice netlist. No
>   biggie, years of Sun and Linux experience (and importantly, zero
>   windows experience) make this a piece of cake. gschem editor experience
>   is remarkably like DA.
>
>   But, I get a truckload of errors. I start researching and find this
>   gem:
>
>   [1]http://www.brorson.com/gEDA/SPICE/x150.html
>
>   Basically, I need to painfully enter all the parameters for a 741 !
>   There is even a file parameter where I can presumably enter the
>   filename containing the spice model by hand.
>
>   At that point I stopped to take stock of the whole thing. Correct me if
>   I am wrong, but isn't the entire point of having a GUI entry to ease
>   and more importantly, speed, the development process ? So, precisely in
>   which way is using gschem more efficient than typing in a spice script
>   if I have to painfully pointy-and-clicky every damn single attribute
>   into this ? Some might say that after defining a symbol, I can copy and
>   paste it to create more complicated circuits, but that is what a subckt
>   definition is for.
>
>   I guess I am asking - what purpose does gschem serve (other than to
>   create pretty pictures, and being a humongous waste of time otherwise
>   since its basically asking you to enter the entire spice script, albeit
>   in disparate pretty boxes) ?
>
>   Thanks.
>
> References
>
>   1. http://www.brorson.com/gEDA/SPICE/x150.html
>
>
>
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>
>


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