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Old 4th August 2005, 01:32 AM   #1
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Default What the heck is this electrical component?

This is part of the audio board of my teac a-l700p amp. I know what resistors and caps look like, but I have no idea what the long slinder gray component is. Is it a resistor in disguise or something else? The board labels it as BD86 or BD85. Thanks for your time in this matter, Kevin.
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Old 4th August 2005, 01:47 AM   #2
Mr Evil is offline Mr Evil  United Kingdom
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They look rather like ferrite beads to me, used to create a small inductance to filter RF.
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Old 4th August 2005, 02:34 AM   #3
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Default Mr. Evil has it right...

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Originally posted by Mr Evil
They look rather like ferrite beads to me, used to create a small inductance to filter RF.
We use these a lot in the products I work on, as RF filters. We mostly use SMT versions, though.
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Old 4th August 2005, 03:45 AM   #4
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Definitely a ferrite bead.
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Old 4th August 2005, 04:03 AM   #5
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Do ferrite beads affect the sound in a good way or bad way? I am just curious since tripath never mentions it in their spreadsheet.
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Old 4th August 2005, 04:19 AM   #6
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No components are inherently good or bad for the sound; it depends how they are used. They will look pretty much like a plain piece of wire at audio frequencies, so they shouldn't do any harm, but applied appropriately they will keep high frequency nasties out (or stop them escaping, if they are internally generated), which is of particular importance for switching amps.
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Old 4th August 2005, 06:11 AM   #7
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Yes, they are ferrite beads, but they do not create a small inductance to filter RF. Some of you guys need to read up on the basics................

Jocko
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Old 4th August 2005, 07:22 AM   #8
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My vote: 0.1uF 63V film caps...

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Old 4th August 2005, 08:13 AM   #9
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Default ferrite beads

Quote:
Originally posted by Jocko Homo
Yes, they are ferrite beads, but they do not create a small inductance to filter RF.
What else are they doing? A short explanation would be very kind.
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Old 4th August 2005, 09:35 AM   #10
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Quote:
Originally posted by janneman
My vote: 0.1uF 63V film caps...

Jan Didden
Oops, I looked at the wrong components...


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