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Hi learning,
first off, what is a "PA" microphone?
Microphones are normally capacitive (Electret) or inductive (dynamic).
Most today's main boards with integrated AF-amplifier don't have a mic preamplifier. Using the windows voice recorder you get a very weak signal only when shouting into the microphone.
Here are schematic and PCB layout for a PC-Mic-Amplifier.
T1 must be a BC550C (hfe > 600)
AF-OUT connects to the outer pin of the 3.5mm stereo plug and Ground connects to the sleeve.
Boncuk
But an unknown type of mic was connected to the MIC IN, not to the LINE IN so it should work fine without adding a preamp.
What type of mic?
How I can attach a coupling capacitor as it is risky to do ?A coupling capacitor between the dynamic mic and MIC IN might allow the dynamic mic to work.
It is not risky to attach a coupling capacitor since the MIC IN connector on a computer has a DC voltage of about only 5V at a very low current. Use a 2.2uF capacitor with its negative wire connected to the mic and its positive wirre connected to the audio input terminal.
Yes, you will have a huge problem.My connection to PC by PA microphone as PA Microphone -> PA Amplifier (MIC socket) -> PA Amplifier ( Speaker terminal) -> PC (MIC IN or LINE IN) Please tell me whether this combination will work without any problem !
Yes, you will have a huge problem.
If the mic and the PA amplifier work probably then their voltage and current are much too high for the MIC IN or LINE IN on the computer and cause the computer to blow up!
If you connect your dynamic mic with a coupling capacitor to the MIC IN of the computer then it should work.
If I add a coupling capacitor in PA Amplifier ( Speaker terminal) then I hope that it will work ! What is your saying ?
Do you have any assembly picture of attaching coupling capacitor to MIC IN of PC ?
Again I repeat DO NOT use the amplifierDave