> 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
