Nicely explained. I just hope all Professors in the school can do that, rather than developping an intuitive understanding after years of confusion by the students. :-) The best lecturer I've experienced is Tom Lee of Stanford EE... best, Yafei --- "Muranyi, Arpad" <arpad.muranyi@xxxxxxxxx> wrote: > Leonard, > > This is not a direct answer to your specific > question, but I hope it helps... > > If you are a visual person, you can explain it > to yourself by imagining what happens when you > pour water into one end of a long narrow channel, > like a gutter under your roof. > > The water will flow to the other end, and when it > hits the closing wall, it splashes up. Why? > There is nowhere to go. Imagine what happens > when the end wall is missing? It flows straight > out with the levels lowering down to its bottom. > What if the impedance is matched, i.e. you have > an identical channel filled with the same amount > of water in it? The water wave in your first > channel will propagate nicely into the second > channel without splashes... > > Arpad Muranyi > Intel Corporation > =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= > =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D > > =20 > > -----Original Message----- > From: si-list-bounce@xxxxxxxxxxxxx > [mailto:si-list-bounce@xxxxxxxxxxxxx] = > On Behalf Of Leonard Alexman > Sent: Wednesday, October 19, 2005 10:54 AM > To: si-list@xxxxxxxxxxxxx > Subject: [SI-LIST] Transmission lines reflections > again > > > Hi , > > I am still trying to figure out how in a simple open > transmission line = > the > voltage gets doubled at the end of the line. I have > seen the formulas = > and > rope drawings but only found one article that kind > of goes into what I = > what. > > The article I read had a battery connected to a > serries50 ohm resistor = > and a > 50 ohm transmission line. The equivelant circuit of > the transmission > linsmission line is a series inductor with a > capacitor to the return = > path to > the battery > When the last capacitor in the line is charged, > there is no voltage = > across > the last inductor and current flow through the last > inductor stops. With = > no > current flow to maintain it, the magnetic field in > the last inductor > collapses and forces current to continue to flow in > the same direction = > into > the last capacitor. Because the direction of current > has not changed, = > the > capacitor charges in the same direction, thereby > increasing the charge = > in > the capacitor. Since the energy in the magnetic > field equals the energy = > in > the capacitor, the energy transfer to the capacitor > doubles the voltage > across the capacitor. The last capacitor is now > charged to the battery > voltage and the current in the last inductor drops > to zero. > > My question is=20 > > 1. Since the second to the last cap is charged to > 1/2 the battery = > voltage > where does the current flow from the left end of the > last inductor to = > the > bottom of the last cap in order to double the > voltage on the last cap ? > > Can anyone point me to an article that explains the > above in detail ? > > Leonard Alexman > ------------------------------------------------------------------ > To unsubscribe from si-list: > si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in > the Subject field > > or to administer your membership from a web page, go > to: > //www.freelists.org/webpage/si-list > > For help: > si-list-request@xxxxxxxxxxxxx with 'help' in the > Subject field > > List FAQ wiki page is located at: > > http://si-list.org/wiki/wiki.pl?Si-List_FAQ > > List technical documents are available at: > http://www.si-list.org > > List archives are viewable at: > //www.freelists.org/archives/si-list > or at our remote archives: > http://groups.yahoo.com/group/si-list/messages > Old (prior to June 6, 2001) list archives are > viewable at: > http://www.qsl.net/wb6tpu > > > ------------------------------------------------------------------ To unsubscribe from si-list: si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field or to administer your membership from a web page, go to: //www.freelists.org/webpage/si-list For help: si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field List FAQ wiki page is located at: http://si-list.org/wiki/wiki.pl?Si-List_FAQ List technical documents are available at: http://www.si-list.org List archives are viewable at: //www.freelists.org/archives/si-list or at our remote archives: http://groups.yahoo.com/group/si-list/messages Old (prior to June 6, 2001) list archives are viewable at: http://www.qsl.net/wb6tpu