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Microphone On The Phone Line And Its Plugin
Jan 03, 2017

When using low-impedance microphones, with a 30-meter-long microphone cordand not picked up to AC hum or causing a loss of high frequency.

Microphone line is made up of 1~2 isolated conductors, shielded electronic communication outside hum of metal braid shield wrap. Check if you have AC hum is there no welding in prison places.

Microphone wire method: 1 foot 2 foot shielded line "hot end" or positive (usuallyred or white wire) pin 3 cold or negative (usually black cable)

If three-core kanongtou received a call from 2-wire non-balanced plug connection:telephone plug top (short end) hot wire sleeve (long end) shielded cable or cold end.

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