/diy/ - Do It Yourself

>>1440219

use a passive mixer to mix the L and R signals and feed them into one of the inputs. you just need 3 resistors.

>>1177334
>Well I measured it to be just over 1V with a maximum of 2.6V. Different standard?

the other dude is sorta confused. the mics are usually biased from a 5V source in series with a resistor of around 2K. since the preamp inside the mic takes some current, it creates a voltage divider with the 2K resistor, resulting in approx 2Vdc at the output (with a tiny millivolt audio signal riding on top of that.)

as for your project, whatever the heck it's supposed to accomplish, you shouldnt need any external op-amps or batteries, you just need to create a passive mixer using resistors. the resistor in series with the music source should be way bigger so that you get an attenuation of 100 or more. also, putting a cap in series with the music source would eliminate a potential source of problems.