to build a audio mixer where you can take multiple line inputs, cd players, computer, phone, synthesizers, etc... and mix them together to a single stereo "master" out.
The "master" out can be a power amplifier or powered speakers. So far tested powered speakers and works good and I expect this to work with "professional" grade amplifier/speakers. I.e: Mackies, Adams, Bryston etc... I will test with as much gear I can get my hands on...
So what I want to do is split the "master" out to 3 outputs: master, room and record and each with their own volumes.
- I'm thinking of taking R8A, R8B (the master POT) and replacing with a regular 22K resistor.
- Split the stereo signal after R9 and R10 and add 3 22K POTs there
- Finally line to 3 separate "stereo" jacks/channels
I'm going to do some testing. But I don't have enough gear to test it all, I'm thinking it will be ok so long the input impedance of the destination devices is bigger enough then the total out?
Does my plan sound sane or do you think I should add buffers to each of the split signal?
Pots are log.
- http://www.bryston.com/PDF/Manuals/3B_4BSST_MANUAL.pdf 50 Kohms single ended, 20 Kohms balanced
- https://www.adam-audio.com/en/ax-series/a7x/ 30 kOhm
- https://www.zoom-na.com/products/field-video-recording/field-recording/zoom-h4n-handy-recorder 480 kΩ unbalanced
Using TL072 as the op-amp.