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 <[email protected]> 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) ;-) > > ----------------------------------------------------- > > > ______________________________________________________________ > 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]
