ODP: one for the theorist

[Roman Sowa]

> -----Oryginalna wiadomość-----
> Od:	Martin Czech [SMTP:martin.czech at intermetall.de]
> Wysłano:	14 lipca 1999 13:41
> Do:	martin.czech at intermetall.de; Juergen.Haible at nbgm.siemens.de
> DW:	synth-diy at mailhost.bpa.nl
> Temat:	RE: one for the theorist
> 
> People could think that they could get a equivalent concentrated element
> circuit
> by just counting pcb line lenght and thus dropping a L here and there.
> In the case of several connected current loops this will obviously not
> work.
> There will be problems doing the "large run" and smaller loops and
> comparing the L.
	[Roman Sowa]  
	And this pcb line will be seen from one end as inductor, capacitor,
	short, or nothing at all depending on frequency and line's
	neigbourhood. BTW, I saw some PCB software which allowed you
	to simulate the circuit including all stray effects present on PCB.
	The coolest thing was frequency response of a filter made only
	from few cleverly spaced tracks. I can't remember the name of it,
	and it cost a fortune.

> There is "inner" Inductance of a wire, ie. that part of the whole
> inductance caused by current distribution in the wire only.
> This makes sense, but is only a part.
	[Roman Sowa]  
	Didn't know about that. Is it called 'wandering currents' or so?