Re: gEDA-user: OpAmp with internally connected pins

["John Luciani" <jluciani@xxxxxxxxx>]

On 11/2/07, Wojciech Kazubski <wk0@xxxxx> wrote:
> >
> > For logic symbols I use a separate power/gnd symbol.
> > I have a script that creates the power symbols and removes hidden nets from
> > the existing gschem logic symbols ---
> >
> > http://www.luciani.org/geda/util/util-index.html#create-np-symbols
> >
> What about the following idea?
> 1) Replace "net=xxx" attributes from all symbols winh something other, like "power=xxx" (an automated tool may use "power=" attributes  to guess what power symbol to use or create)
>  or
> 2b) use small tool that will look for "power=xxx" attributes inside the symbol and add suitable external "net=xxx" attribure, possibly renaming VCC net from TTLs and VDD from CMOSes to +5Vd or so if user wants this.
>
> Recently I had some problems with connecting VSS power supply of 4000 series CMOS chips to the ground net named GND. Simply connecting two power symbol to ground doesn't work.

In the power symbols I use there are no net labels so each pin can be
attached anywhere.

For the logic parts I put all of the power symbols with their decoupling caps in
one section of the schematic. If you use a script to connect up the
power how do you communicate the connection information to the person
viewing the schematic?
It seems like it could get confusing in a system with multiple
isolated supplies.

(* jcl *)

-- 
http://www.luciani.org


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