I have recently purchased a condenser microphone and a mixer which supports phantom power. I connected the microphone to the mixer and then connected the mixer with my laptop by using RCA.
The green circle shows where I connected the microphone, red ones are the RCA connectors with a 6.3mm adapter and I also connected my headphones. Once I did all that, I can hear the sound coming from my laptop and also hear my voice when I talk into the microphone, but I am not able to record my voice on the laptop.