On Tue, Apr 8, 2014 at 9:56 AM, Josh Fiden <[email protected]> wrote: > My recollection is that 3.5mm and 1/8" have always been used > interchangeably. I believe (guess) the discrepancy is simply that the plug > originated as 3.5mm and 1/8" is the closest fractional inch (9/64 is > unsatisfying).
Wikipedia (which knows everything, right?) seems to concur... http://en.wikipedia.org/wiki/Phone_connector_(audio) 73, ~iain / N6ML On Tue, Apr 8, 2014 at 9:56 AM, Josh Fiden <[email protected]> wrote: > I'm curious about this. If anyone has reference to an actual 1/8" connector, > please forward off list. I don't recall them ever being anything but 3.5mm. > My recollection is that 3.5mm and 1/8" have always been used > interchangeably. I believe (guess) the discrepancy is simply that the plug > originated as 3.5mm and 1/8" is the closest fractional inch (9/64 is > unsatisfying). > > Checking specifications from one reputable manufacturer calls out sleeve > diameter of 3.5+/-0.05mm for the plug and 3.6mm for the entrance of the > jack. As with so many things, I'm sure there's no difficulty finding poorly > designed/manufactured Asian parts that deviate. > > There's no such issue with 1/4" phone connectors. They are called out either > as 6.35mm or 6.3mm, which is quite accurate because they originated as the > fractional inch dimension. > > 73, > Josh W6XU > > > On 4/7/2014 7:11 PM, Don Wilhelm wrote: >> >> 3.5mm and 1/8 inch are now the same thing - one place calls them 3.5mm >> while others use the 1/8 inch designation for the same thing. >> >> Yes, it was not always so, but that was well before stereo plugs and jacks >> came into existence. >> The big issue now is manufacturing tolerances that might mean some jack >> and plug combinations are tight while other combinations may appear to be >> sloppy. >> >> 1/4 inch plugs and jacks are more tolerant of sloppy tolerances i.e +/- >> 0.01 mm compared to 3.5mm is much greater than +/- 0.01 mm compared to 7 mm >> (or is it 8mm?). ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected]
