Kwak-Clock-7

Honda Z50M · 28th September 2010, 07:08 PM

Need some advice as to value of ferrite beads (what frequency etc)

Also has anyone built one using surface mount resistors and capacitors?

Thanks in advance
Tom

star882 · 29th September 2010, 03:31 AM

Ferrite beads can definitely help with EMI problems, especially at the high frequencies that tend to cause problems.

SMD will give you less parasitic capacitances and inductances, and yes, ferrite beads are available in SMD. Main problem is the difficulty for breadboarding and prototyping, but big SMD parts are very easy to work with.

Honda Z50M · 29th September 2010, 07:15 AM

Thanks, but which ferrite beads?? or does it not matter too much? I have a couple of toroidal shaped ferrites but they're about 20mm diameter although I could use just 1 and wrap each wire around opposite hallves.
And there's another question how many times does the wire need to be wrapped around the ferrite or just passed through it?

Tom

marce · 29th September 2010, 11:51 AM

http://www.steward.com/pdfs/emi/tech...20in%20EMI.pdf

28th September 2010, 07:08 PM	#1
Honda Z50M diyAudio Member Join Date: Sep 2010 Location: Cambridge	Kwak-Clock-7 Need some advice as to value of ferrite beads (what frequency etc) Also has anyone built one using surface mount resistors and capacitors? Thanks in advance Tom

29th September 2010, 03:31 AM	#2
star882 diyAudio Member Join Date: Mar 2007	Ferrite beads can definitely help with EMI problems, especially at the high frequencies that tend to cause problems. SMD will give you less parasitic capacitances and inductances, and yes, ferrite beads are available in SMD. Main problem is the difficulty for breadboarding and prototyping, but big SMD parts are very easy to work with. __________________ "Fully on MOSFET = closed switch, Fully off MOSFET = open switch, Half on MOSFET = poor imitation of Tiffany Yep." - also applies to IGBTs!

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29th September 2010, 07:15 AM	#3
Honda Z50M diyAudio Member Join Date: Sep 2010 Location: Cambridge	Thanks, but which ferrite beads?? or does it not matter too much? I have a couple of toroidal shaped ferrites but they're about 20mm diameter although I could use just 1 and wrap each wire around opposite hallves. And there's another question how many times does the wire need to be wrapped around the ferrite or just passed through it? Tom

29th September 2010, 11:51 AM	#4
marce diyAudio Member Join Date: Jun 2007 Location: Blackburn, Lancs	http://www.steward.com/pdfs/emi/tech...20in%20EMI.pdf

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