There are simple mixers that are probably cheaper than the parts you would need to build one.
The Behringer MX400 is a four-channel mono mixer for $25. https://www.amazon.com/Behringer-Micromix-MX400-Low-Noise-4-Channel/dp/B000KGYAYQ The Rolls MX51S is a four-channel stereo mixer for $55. https://www.amazon.com/Rolls-MX51S-Four-Channel-Stereo-Mixer/dp/B0002BG2S6/ The Rolls MX42 is a passive (no amps) four-channel stereo mixer for $49. https://www.amazon.com/Rolls-MX42-Stereo-Mini-Mixer/dp/B00102ZN40/ Pyle also makes some simple, inexpensive mixers. Check that the box has the connectors you need. You might end up spending as much on connectors as on the mixer! wunder K6WRU Walter Underwood CM87wj http://observer.wunderwood.org/ (my blog) > On Jan 9, 2019, at 3:03 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 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
