According to the Fred Cady book, the mic bias on the tip is +3.3 V. The ring has a different voltage, used for PTT and UP/DOWN. That voltage is not as clean as the mic bias. It is better tot split that out. You can do that with an off-the-shelf stereo to mono splitter. See this blog post for details.
https://observer.wunderwood.org/2015/08/16/yamaha-cm500-headset-with-ptt-on-elecraft-kx3/ wunder K6WRU Walter Underwood CM87wj http://observer.wunderwood.org/ (my blog) > On Jun 22, 2022, at 7:23 PM, John Pierce via Elecraft > <elecraft@mailman.qth.net> wrote: > > What is the bias voltage provided? Is there a current limitation? > > > > AD2F John > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to wun...@wunderwood.org ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
