Without knowing more details I think levels are the biggest problem. Otherwise a simple passive mixer comprised of a few resistors would suffice.
Sent from my iPad > On Jan 9, 2019, at 6:03 PM, Richards <jricha...@k8jhr.com> wrote: > > Good Day. > > Background: > > I am assisting a blind ham who also suffers some hearing loss. I suggested > using headphones to attenuate ambient environmental noise as he operates. > The rub is, he needs to hear both his receiver AND his computer (which > provides audible feedback when logging contacts and performing other duties.) > > Question: > > Can anyone suggest a simple passive (or active) mixer circuit schema I can > build for him to safely mix audio signals from his transceiver headphone jack > with audio signals from his computer sound card headphone jack? > > Discussion: > > While there are multiple commercially produced simple and complex mixing > products in the marketplace, I would prefer to build an inexpensive, small > footprint solution we can easily incorporate in his station to minimize > clutter and the number of cables, jacks, and controls -- he contends with > plenty of that already. I suppose one solution might be a simple Y-adapter > cable, but that seems too easy and I wonder whether we should isolate the > signals and/or grounds in some way? (e.g., I do not wish to cause any > "Pin-1" grounding issues, and etc.) > > Any traction? Can anyone point me to an appropriate circuit schematic or > other resource? I don 't mind doing homework, and while I enjoy building > stuff and I am familiar with the basic concepts involved, I could use a leg > up on this project, especially to keep it simple and easy to build and > implement. Please reply off list if this question is too far off topic, > although I suspect there are many hams who might be interested in the result, > besides similarly situated disabled operators. > > Thank you - James - K8JHR - > --------------------------------------- > > > > > ______________________________________________________________ > 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 w...@w2xj.net ______________________________________________________________ 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
