I definately enjoy reading some of the 'Off Subject' discussions on this forum. It tends to break up some bad days. Speaking of Hi-Fi enthusiasts, I am always reminded of the Duplex Wall Socket that had been Cryogenically Cooled for several hours. This was suppose to increase the fidelity of you Hi-Fi System. It was listed on ebay and at least one was sold for $100.00. At the time I thought I might be in the wrong business.
Cecil Waterhouse Koyote Circuits International -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Behalf Of Jon Elson Sent: Thursday, August 04, 2005 1:14 PM To: Protel EDA Discussion List Subject: Re: [PEDA] Vias. Andy Gulliver wrote: >... and don't forget to allow for the effect of the Coriolis force, as outlined in the following which is from a Hi-Fi forum a few years back (around the time people were using green ink round the edge of CDs): > > > >>Another consideration is the coriolis force which causes electrons >>to spin around the edge of plated through holes as they pass >>from one level of the board to another. Since the direction >>of spin around the hole does not change whether the electron >>is going down the hole or up the hole, the component of current >>around the hole is a full wave rectified or frequency doubled >>version of the total current, causing second harmonic distortion. >> >> SECOND harmonic distortion? On AUDIO signals? Oh, must be really BIG vias. You can calculate the resonant frequency of current circling around a via hole, and it is going to be well into the microwave region. >>Also the coriolis force changes direction from the northern >>to the southern hemisphere and changes magnitude with latitude, >>being strongest at the poles. This is the reason the right >>stereo channel sounds better in the northern hemisphere and >>the left channel sounds better in the southern hemisphere. >> >> The Coriolis force is very weak on things the size of meso-atmospheric cyclones, generally many hundreds of miles across. The Coriolis force on femtograms of electrons in a space less than a millimeter across is going to be swamped by many orders of magnitude by thermal noise. >>For balanced performance all audio circuit boards should >>be mounted vertically and in a north south direction. This >>not only reduces coriolis effects but also minimizes >>Hall Effect voltages due to the earths magnetic field. >> >> > > >Unfortunately I don't have an exact date, but ISTR it was early April that year :-) > > Many of these high-end audio guys are so far from any scientific basis that they don't reserve stuff like this for the first of April! Check out some of the audio experimenter magazines - wild stuff. Jon ____________________________________________________________ You are subscribed to the PEDA discussion forum To Post messages: mailto:[email protected] Unsubscribe and Other Options: http://techservinc.com/mailman/listinfo/peda_techservinc.com Browse or Search Old Archives (2001-2004): http://www.mail-archive.com/[email protected] Browse or Search Current Archives (2004-Current): http://www.mail-archive.com/[email protected] ____________________________________________________________ You are subscribed to the PEDA discussion forum To Post messages: mailto:[email protected] Unsubscribe and Other Options: http://techservinc.com/mailman/listinfo/peda_techservinc.com Browse or Search Old Archives (2001-2004): http://www.mail-archive.com/[email protected] Browse or Search Current Archives (2004-Current): http://www.mail-archive.com/[email protected]
