kicad-developers team mailing list archive

[Adam Wolf <adamwolf@xxxxxxxxxxxxxxxxxxxx>]

Andy,

Regardless of the technical merits of the above replies, I want to make
something clear.

When I use eeschema, sometimes I am making sketches to send to remote team
members, and I definitely don't know the part number at that point.

This is what I was doing for the original email.  I was laying out a
schematic with a pfet and an opamp.  I knew what opamp I wanted to use, but
I didn't know what pfet I wanted, because I was creating a sketch of a
circuit so I could send to a collaborator.

I'm not suggesting we change the public library footprints, or even make
any changes to anything.  I was mostly wondering if a feature I use
frequently was going away.

Adam Wolf
Cofounder and Engineer
Wayne and Layne

On Mon, Jun 8, 2015 at 11:53 AM, Adam Wolf <adamwolf@xxxxxxxxxxxxxxxxxxxx>
wrote:

> Hi folks!
>
> This is just to say my original question has been answered quite a few
> replies up, which was that KiCad still supports both philosophies, and the
> library team is going this way.
>
> Thanks everyone!  I'm certain there's a bunch more discussion we can do on
> this, but I'm glad I got the clarification from Wayne that I did.
>
> Adam Wolf
>
> On Mon, Jun 8, 2015 at 11:42 AM, Andy Peters <devel@xxxxxxxxx> wrote:
>
>>
>> > On Jun 7, 2015, at 1:33 AM, Eldar Khayrullin <eldar.khayrullin@xxxxxxx>
>> wrote:
>> >
>> >> What problem is this trying to solve?
>>
>> > No copy sch symbols, no copy pcb footprints,
>> > more ready parts with same sch symbol and footprint, but different
>> > pins assignment.
>>
>> I still don’t understand why you think there are problems.
>>
>> Let’s talk op-amps for the moment.
>>
>> Does your schematic library have a generic op-amp which you place on
>> every design? Do you then go into the schematic and modify the symbol you
>> placed so that it calls out TL072 and the correct unit, and then do you go
>> in and also add the desired footprint?
>>
>> If so, for the love of G-d, WHY? That is a recipe for disaster.
>>
>> Why not just have in your library a few of your favorite op-amps:
>> TL072ACD, OPA2134UA, OP275GSZ. Note the symbol names, which are the vendor
>> part numbers and as such have the footprint encoded into them. And, each
>> symbol has the correct footprint embedded in it.
>>
>> Do you consider this “unnecessary duplication” in that each of these dual
>> op-amps has the same symbol and uses the same footprint (SOIC-8)?
>>
>> It is MUCH harder to make an expensive mistake if the symbol — the
>> “component” — is “complete,” in that it has the correct pin-out which
>> matches the footprint.
>>
>> Your suggestion of a "components library” solves a problem which doesn’t
>> actually exist.
>>
>> -a
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>
>