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Telephone power supply noise
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Telephone power supply noise
On Thu, 29 Apr 2004 19:57:36 +0100,
wrote:
i have a US digital phone for which I found a voltage convertor from
Maplin for UK supply. The telephone tone is ok but as soon as I dial,
I get a humming noise. I tried to use the phone with it's American
power plug and using a 85W step down transformer and all is fine.
Can the Maplin power adaptor be an unregulated or do I need to go and
have it changed to a different type?
Further to this, will a ferrite ring help to supress this noise?
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Telephone power supply noise