Audio feed back from PC to station speakers

gibersop · Nov 16, 2018

Hello! I am trying to set up a new feed for my Fire Department. I have everything ready to go. However when I plug the stereo jack into the mic port on my pc two things happen. Either I get a horrible high pitched whistle, or the audio is distorted in the station speakers. I am tapping into the "in-house" speaker system. The system is a full PA system for the Phone and Radio. I tried to tap into a speaker in the room and also to the back of the radio itself. Can someone help me with suggestions?

ProScan · Nov 16, 2018

gibersop said:
Hello! I am trying to set up a new feed for my Fire Department. I have everything ready to go. However when I plug the stereo jack into the mic port on my pc two things happen. Either I get a horrible high pitched whistle, or the audio is distorted in the station speakers. I am tapping into the "in-house" speaker system. The system is a full PA system for the Phone and Radio. I tried to tap into a speaker in the room and also to the back of the radio itself. Can someone help me with suggestions?

It sounds like you are taping a 70 volt speaker. Don't do that. Go to the amp and choose a non 70 volt output or if using a telephone circuit interface, find an output there. Also if using Mic input versus Line In, turn down the Mic level at the Win Mixer.

M105 · Nov 19, 2018

gibersop said:
Hello! I am trying to set up a new feed for my Fire Department. I have everything ready to go. However when I plug the stereo jack into the mic port on my pc two things happen. Either I get a horrible high pitched whistle, or the audio is distorted in the station speakers. I am tapping into the "in-house" speaker system. The system is a full PA system for the Phone and Radio. I tried to tap into a speaker in the room and also to the back of the radio itself. Can someone help me with suggestions?

Do what Proscan said if possible. If you must tap into a speaker you will need a voltage divider to bring the very high level speaker output down to a very very low level required by the microphone input. Also a 1 mfd capacitor will provide DC isolation. I recommend a non polarized capacitor.

Attached diagram pilfered from the web should be worth a try.

Audio feed back from PC to station speakers

gibersop

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ProScan

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M105

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