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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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Ferrite/Choke question
I have a weird question. I recently bought a second Linksys BEFSX41
VPN router to test out some new firmware before deploying it elsewhere. I noticed that when it was on, there was a very audible buzzy/hissing- like noise coming from it. I ended up opening it up and tracing it to two chokes on the 12VDC input line. They look like Fig D in the following link: http://www.jwmiller.com/pdf2/FB2000.pdf By moving them around, I could sort-of make the noise worse or better, but couldn't eliminate it. As a temporary workaround, I simply shorted them out with a solder bridge on the solder-side of the board. On the other router, you can barely hear the hissing only when your ear is pretty much presed up against it. My question is: What is causing the hissing, and why is it doing it on DC? Any fixes to stop the hissing without losing the EMI suppression? -- If there is a no_junk in my address, please REMOVE it before replying! All junk mail senders will be prosecuted to the fullest extent of the law!! http://home.att.net/~andyross |
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