I'd like to make a small male/female patch-cord that would passively mix-down stereo headphone output to two-channel mono.
Assuming typical MP3 player drive levels, is this circuit OK?
Plug > -- to -- > Jack ~~~~ ~~~~ Left __[R1]___.__.__ Left Right __[R2]___| |__ Right Common _______________ Common
R1 = R2 = 1000 ohms
Thanks for any advice!.