My recent K3 has Bournes transformers on the KIO3A board. 73, Pete N4ZR
The World Contest Station Database, updated daily at www.conteststations.com The Reverse Beacon Network at http://reversebeacon.net, blog at reversebeacon.blogspot.com, spots at telnet.reversebeacon.net, port 7000 On 7/3/2010 7:48 AM, Paul Christensen wrote: >> So the K3 has a fully floating ground on the line audio input, isolated >> from >> the chassis??? Is that correct? 73 Tom >> > The K3's line input transformer primary is connected to the 1/8" TRS jack > using tip and sleeve where the sleeve floats above chassis ground. > > The on-line schematic of the KIO3 board was revised a few weeks ago and it > looks like the Bourns LM-NP-1001 transformer may now be an alternative from > Elecraft although I haven't looked at pin compatibility with the existing > Tamura TTC-108 transformers. > > According to Jack Smith's measurements, the Bourns transformers have very > good frequency response and THD characteristics as long as input levels > remain at typical -10 dBV from consumer-grade PC sound cards. At just USD > $1.75 ea. from Mouser, they look like a good value. > > Paul, W9AC > > ______________________________________________________________ > 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 > > > ______________________________________________________________ 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
