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From: Roger Dewhurst on 10 Aug 2010 19:12 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
From: Grant on 10 Aug 2010 19:45 On Wed, 11 Aug 2010 11:12:05 +1200, Roger Dewhurst <dewhurst(a)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? Yup, just a ferrite bead to reduce RFI. Grant.
From: Sjouke Burry on 10 Aug 2010 19:46 Roger Dewhurst 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 Yes. Maybe. Depends.
From: John Larkin on 10 Aug 2010 20:58 On Wed, 11 Aug 2010 11:12:05 +1200, Roger Dewhurst <dewhurst(a)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
From: BeeJ on 11 Aug 2010 21:09
John Larkin laid this down on his screen : > On Wed, 11 Aug 2010 11:12:05 +1200, Roger Dewhurst > <dewhurst(a)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. |