A while ago, I added a 12 V audio amp to my setup and wrote it up on my blog. I don’t think that particular amp is available now, but I’m sure there are similar ones.
https://observer.wunderwood.org/2017/03/04/speakers-for-my-elecraft-kx3/ wunder K6WRU Walter Underwood CM87wj http://observer.wunderwood.org/ (my blog) > On Feb 16, 2026, at 4:30 PM, Walter Underwood via Elecraft > <[email protected]> wrote: > > The KX3 “PHONES” jack is for headphones. It produces 100 mW. —wunder, K6WRU > >> On Feb 16, 2026, at 3:44 PM, Jim Brown via Elecraft >> <[email protected]> wrote: >> >> On 2/16/2026 3:15 PM, Phil Hystad via Elecraft wrote: >>> Can someone give pointers on this? >> >> The K3, K3S, and K4 have separate audio power amplifiers for headphones and >> speakers, each with their own individual output jacks. I haven't studied the >> schematic, but I suspect that the KX3 has only the amplifiers for >> headphones. Speakers require considerably more power. >> >> The headphone output could probably drive a powered speaker (that is, one >> with its own built-in amplifier), but powered speakers are notoriously bad >> for RFI, both generating noise and being susceptible to nearby transmitters, >> so are unlikely to be a solution. >> >> 73, Jim K9YC >> ______________________________________________________________ >> 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] > > ______________________________________________________________ > 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] ______________________________________________________________ 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]
