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Hissing noise at cd player

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by kensh103 1 view

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Hi Guys, I'am having a problem with regards to audio output. I'm hooking up a cdrom at my sony amplifier but upon power on the cdrom, hissing noise and cdrom motor noise can be heard at the speakers. But for other devices such as mp3 players and others, there's no problem with the sound (all are clean and clear).

I've tried to put a low pass filters but still I can hear the motor and hissing noise.

How can I eliminate this noise? If there is, can you post a schematic diagram of the filter to be use?

Thanks in advance and more power!

3 replies

by mjd420nova

This sounds like a combination of problems. The first is the close proximity of the data/audio cables to and from the drive too close to the power cables within the PC. The other problem is a border line power supply that is not providing clean power to the drive and allowing drive functions to affect the power supply and thereby getting into the sound card/audio sections of the PC. Replacing the power supply with one that has a higher average power rating and isolating the audio/data cables to the drive away from power cables and even wrapping them with foil and grounding the foil would eliminate this as a source of the noise.

by thechas

Most computer CD-ROM drives are using very low quality D/A converters and audio stages. This is because most computers now use the digital data and convert the data to audio at the sound processor.

The only way you are going to get better audio out of your CD-ROM drive is to rebuild the electronics in the drive, or replace the drive with a higher quality drive.

Personally, while I know it would be an extra device, you might find that even a cheap portable CD drive has better audio than a CD-ROM drive does.

Another option would be to connect to the audio out jack on your computer.

If you are using an external CD-ROM drive, the problem could also be the power supply for the drive. Changing from a switch mode supply to a linear supply might help.

Chas

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