Hi,
I was wondering how would behave this circuit:



I wanted to create electret microphone (Q1) amplifier that is powered via microphone input from my PC sound card (around 2.5V - I will check later). Is it going to work properly? I'm not sure about connection output of opamp.

 

When you check, also check how much current is available.

 

Your PC sound card already has a microphone preamp on it. Why do you want to add another amplifier that will probably overload the input of the sound card preamp?

Your new circuit must use an opamp that works when powered with a low voltage and a very low current.
The inductor will probably pickup interference and cut all audio low frequencies from the mic.

 

My integrated sound card has weak microphone amplifier. In its settings I have to choose +30dB digital amplification. However it also amplifies all noise. I have tested mic input with other preamplifier, which I built and it worked. Anyway, I’m going try self powered version.

You are right. I can get rid of inductor or just leave it for opamp supply.

 

The 1k resistor that powers your mic has a very low resistance that reduces the mic output level. Try a higher resistance.
On my mic circuits I use a 9V supply and a 1k resistor with a capacitor to ground as a filter, then a 10k resistor to load and power my electret mic.