Roger Dewhurst
Guest
Wed Aug 11, 2010 12:12 am
Cables which connect USB ports with peripherals such as cameras
frequently have black cylindrical objects on the cables a few
centimetres away from the USB end. These may be about 10mm in diameter
and 20 mm long. Are these things ferrite beads used to eliminate stray
pulses in the cable or something else? If so what?
R
Grant
Guest
Wed Aug 11, 2010 12:45 am
On Wed, 11 Aug 2010 11:12:05 +1200, Roger Dewhurst <dewhurst_at_wave.co.nz> wrote:
Quote:
Cables which connect USB ports with peripherals such as cameras
frequently have black cylindrical objects on the cables a few
centimetres away from the USB end. These may be about 10mm in diameter
and 20 mm long. Are these things ferrite beads used to eliminate stray
pulses in the cable or something else? If so what?
Yup, just a ferrite bead to reduce RFI.
Grant.
Sjouke Burry
Guest
Wed Aug 11, 2010 12:46 am
Roger Dewhurst wrote:
Quote:
Cables which connect USB ports with peripherals such as cameras
frequently have black cylindrical objects on the cables a few
centimetres away from the USB end. These may be about 10mm in diameter
and 20 mm long. Are these things ferrite beads used to eliminate stray
pulses in the cable or something else? If so what?
R
Yes. Maybe. Depends.
John Larkin
Guest
Wed Aug 11, 2010 1:58 am
On Wed, 11 Aug 2010 11:12:05 +1200, Roger Dewhurst
<dewhurst_at_wave.co.nz> wrote:
Quote:
Cables which connect USB ports with peripherals such as cameras
frequently have black cylindrical objects on the cables a few
centimetres away from the USB end. These may be about 10mm in diameter
and 20 mm long. Are these things ferrite beads used to eliminate stray
pulses in the cable or something else? If so what?
R
EMI traps, so they can pass FCC/CE radiated interferance specs.
John
BeeJ
Guest
Thu Aug 12, 2010 2:09 am
John Larkin laid this down on his screen :
Quote:
On Wed, 11 Aug 2010 11:12:05 +1200, Roger Dewhurst
dewhurst_at_wave.co.nz> wrote:
Cables which connect USB ports with peripherals such as cameras
frequently have black cylindrical objects on the cables a few
centimetres away from the USB end. These may be about 10mm in diameter
and 20 mm long. Are these things ferrite beads used to eliminate stray
pulses in the cable or something else? If so what?
R
EMI traps, so they can pass FCC/CE radiated interferance specs.
John
Conducted.
