Re: gEDA-user: Parts Manager Working Document

[usenet@xxxxxxxxxx (Florian Teply)]

Florian Teply <usenet@xxxxxxxxxx> wrote:
> Gabriel Paubert <paubert@xxxxxxx> wrote:
>> On Mon, Jan 18, 2010 at 11:05:02AM +0100, Florian Teply wrote:
>>> Florian Teply <usenet@xxxxxxxxxx> wrote:
>>> > On Saturday 16 January 2010 06:03:18 Edward Hennessy wrote:
>>> >> On Jan 12, 2010, at 4:18 AM, Florian Teply wrote:
>>> >> > I'm gonna try and make up a list of properties of components starting
>>> >> > with passive devices. I'll go from very generic properties to more
>>> >> > exotic ones in a way i guess will be okay with most users and put that
>>> >> > list up for discussion.
>>> >> 
>>> >> Excellent.  Thanks.
>>> >> 
>>> > No prob, was about do do that anyways as i wanted to have such database for my 
>>> > own use. Left it at work though, hopefully i'll have it in a state for 
>>> > discussion by monday afternoon.
>>> > 
>>> Hmm, looks like i have finished said document, at least i can't think of
>>> anything to add. Surely, it's not finished yet and does only cover
>>> resistors, capacitors and inductors so far as i can't make up my mind
>>> whether diodes should go with semiconductors or with passives...
>>> Anyways, it is to be found at:
>>> http://www.teply.info/gEDA/passive_properties.txt
>>> Anny and all comments welcome, i'll add them to the document.
>> 
>> Consider that some inductances that I use are not symmetric. While
>> I don't know of any asymmetric resistors (but maybe they exist), 
>> some microwave broadband inductors are asymmetric (you can't swap 
>> pins 1 and 2, as for polarized capacitors):
>> 
>> http://www.piconics.com/Conicals.html
>> 
>> Coilcraft has similar products. 
>> 
> I knew i forgot about something i've seen in some distant past... ;-)
> 
>> In other ways, for two terminal components, some are symmetric 
>> dipoles, others are asymmetric. Diodes might fall in the second 
>> category, but diacs might fall in the first.
>> 
> So, one could describe that as either asymmetry or sensitivity to
> direction. Gotta think about that real soon now, and will update the
> document as soon as i get home, have a train to catch now...
> 
Sheesh, that one did take a long time to appear on the list...
in the meanwhile, i've already included that symmetry into the
description of properties, and added variability as well as i forgot to
onclude that in the first place. Variability here means a) fixed vs.
trim vs. pot, as the "standard" way of variability, but it could also be
seen as some sort of framework for other effects. Think dependency of
value on temperature (NTC/PTC/Thermistor), on illumination (LDR, photo
diode), humidity, barometric pressure or any physical entity. Anything
else to add??

Greets,
Florian



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