if the levels were close, 6 resistors costing pennies would do the job. No case or machining necessary.
Sent from my iPad > On Jan 9, 2019, at 8:42 PM, Dave Fugleberg <[email protected]> wrote: > > I usually like to build stuff when I can, but I have to agree with the > others who suggested a commercial mixer. They are cheap and work well. > I recently bought a small behringer USB mixer for under 50 bucks for a > project at work. It acts as a USB sound card, so you can mix audio to or > from the PC with other sources. You can adjust levels, equalization, and > position (left/right) for each source. > I doubt one could homebrew an equivalent unit any cheaper. > Good luck with your project! I’m sure your friend will appreciate it. > >> On Wed, Jan 9, 2019 at 5:30 PM Don Wilhelm <[email protected]> wrote: >> >> James, >> >> There was a homebrew headphone mixer in the ARRL Handbook sometime back >> - simple, with op-amps to isolate the sources. >> >> However with the advent of 2 to 5 input mixers being available in the >> $20 to $60 range (see Amazon), it seems foolish to consider building >> your own - drilling the enclosure for the potentiometers and jacks, >> building the board, mounting things, etc. will take more time and effort >> than is reasonable unless you really like doing those things - and it >> will likely cost more than buying one already built. >> >> The nice thing about a mixer is that you have control over the level of >> each input as well as an overall output volume control. >> >> 73, >> Don W3FPR >> >>> On 1/9/2019 6:03 PM, Richards 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 - ______________________________________________________________ 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]
