JR, Another approach to help your friend is to buy and install an inexpensive, simple mixer as he can clearly make use of it now. You can still build a mixer for the experience. After taking whatever time is necessary for designing, building, and debugging in your shop you can try it out at your friend’s location for a “real world” evaluation by a real “end user”. His feedback may give you an opportunity to provide improvements to your design or tailor it to his specific needs/desires.
Ken WA2LBI On Fri, Jan 11, 2019 at 10:57 Walter Underwood <wun...@wunderwood.org> wrote: > Since you are dead set on building one from scratch, start here. > > https://www.google.com/search?q=audio+mixer+circuit > > You'll see a lot of four-channel mixers because quad op-amps are cheap, > under $1. > > This one has the pots before the op amps. > > https://www.allaboutcircuits.com/projects/build-an-audio-mixer/ > > This one has the pots after the op amps. > > http://www.theorycircuit.com/audio-mixer-circuit/ > > I’d be interested in the parts cost after you have chosen a design. > > wunder > K6WRU > Walter Underwood > CM87wj > http://observer.wunderwood.org/ (my blog) > > > On Jan 10, 2019, at 11:36 PM, Richards <jricha...@k8jhr.com> wrote: > > > > THANK YOU for the several replies to my mixer circuit question - both on > and off the list. Unfortunately, few actually answered the original > question, most often advising me to abandon the project or mix on a > computer sound card. > > > > First - Thanks, Steve, for your input based on personal experience. > While I am familiar with your mixer, Tom prefers a device with stereo > channels and outputs for both headphones and powered speakers. The model > under consideration has only two control pots, making it easier to manage. > Tom truly appreciates your personal input and direct correspondence off > list. He puts a lot of stock in your take. > > > > Second - Tom prefers a simple hardware solution. Locating a manual > control next to the rig is much easier (for him) to manage, than mixing > with a computer sound card. Navigating multiple operating system windows > is a serious challenge because he cannot see the monitor or use a mouse. > This is not the preferred method for a contest or snagging rare DX before a > pileup ensues. Mixing on a computer would be very inconvenient; close > your eyes and try it some day! It's easy for you to say ... but, not so > easy for my friend to do. > > > > Third - We can simply purchase a commercial product (I recommend the > Rolls MINImix MS22s stereo mixer, with just two pots, and outputs for both > headphones and speakers) > > > > UNFORTUNATELY, THAT DEFEATS THE WHOLE POINT BEHIND MY QUESTION. > > > > While I do NOT wish to look a gift horse in the chops, or appear > ungrateful for the advice received so far; money is not the object as I > want to LEARN how this type of circuit works, and do a favor for a friend, > in one stroke. Advising me to save money and just buy a turn-key, > off-the-shelf solution hardly fits the HAM RADIO TRADITION of > experimentation and self-determination, and teaches me nothing about > circuit design. I was hoping to build something MYSELF- earning that > heady sense of self-satisfaction that accompanies the completion of a > successful home brew project. Considering all the experts on this list, > including world class board certified AES audio man Jim Brown, I figured a > simple summing circuit would be a snap. > > > > I close this thread with a big THANK YOU on behalf of my ... um ... > "client," whilst I repair to the proverbial drawing board to renew my > search for a simple summing circuit. > > > > Happy trails to all. JR > > > > (We return you to your regular daily programming content) ;-) > > > > ----------------------------------------------------- > > > > -- Ken WA2LBI Sent from one of my mobile devices ______________________________________________________________ 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
