New memberUsername: Banart
Post Number: 3
When he listens to music with headphones or earbuds, he can't hear one of the channels which degrades his listening experience.
I'd like to build him a compact stereo to mono converter(http://www.kynix.com/Product/Cate/34.html). Ideally, it would have an input 3.5mm stereo jack and an output jack that delivers the converted mono sound.
I've tried the simple circuit below using two jacks where I connected the channels using resistors, however, his devices detect the short circuit and won't play the sound. Using sufficiently large resistors I can get past this, but the volume is too low to be usable.
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I think I should use an op-amp, but I am not sure which configuration is the best. Should I use a summing amplifier? Do I need a 9V battery to supply power, or could I run this on AA or AAA batteries using rail-to-rail op-amps? Which op-amps should I look for / avoid when it comes to audio quality?
I don't have many restrictions on what I can do. I'm an Engineering Physics student and I have access to nearly any circuit component, a 3D printer, a machine shop, and a PCB mill through my university.