TOPIC
I was recording from a cassette deck to my Power Macintosh 8500 series computer. I had the RCA jacks from the cassette deck connected to the computer's RCA audio input jacks, and I noticed that there was a humming noise in the recording. How can I avoid this noise in future recordings?
DISCUSSION When connecting external audio devices (such as a CDROM player, cassette deck, mixing boards, and so on) to the RCA audio input jacks on the Power Macintosh 8500 computer, you may create a ground loop between the audio device and the computer. A ground loop occurs when you connect two devices together with different ground points. Both devices must have the threeprong plug for this to happen. To avoid ground loops, many consumer electronics only have twoprong plugs. The loop most commonly goes from one device to the other along the audio cables and then returns through the ground wire. The difference in potential between the two grounds in the ground loop results in an audible noise or hum. To eliminate this noise, disconnect the audio device from the computer. If the noise disappears, plug the power cords from the computer and the other devices into the same power strip. This places all of the equipment at the same ground potential and eliminates the loop. This article was published in the "Information Alley": Volume II, Issue 19, Page 13 |
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| Document Information | |
| Product Area: | Computers |
| Category: | Power Macintosh |
| Sub Category: | Power Macintosh 8500 |
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