On 11/12/2008, John Ferrell wrote: > I hired in to IBM in 1961. This scheme was used at that time for power > supply regulation. That is, one pair of wires to deliver the power to its > destination and a pair of sense wires back to the regulator where the supply > was dynamically regulated. > > I thought it was simply clever industry practice. > Looking at it from today's viewpoint it looks like they are patenting Ohm's > Law. With today's legal system in the US it might work out for them... > > John Ferrell W8CCW > We used a cable measurement system with a similar power suppy connection. All went well until the sense wire connection broke and the power supply started delivering 8 volts or so to about 500 TTL chips. Cost _a lot_ of money to rebuild but we ended up with a much more reliable system in the end. Regarding the patent, I can't see how they can expect to get away with it. RP -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist