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30th December 2010, 03:53 AM
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#1 |
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diyAudio Member
Join Date: Dec 2010
Location: Pearl of Orient
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What kind of line filter shall I use?
standard EMC/EMI filter can filter out DC?
My amplifier is sharing the same extension with my computer. + My amplifier and computer PSU transformer will buzz when the water heater in house is on. is this an DC interference? |
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30th December 2010, 04:13 AM
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#2 |
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diyAudio Member
Join Date: May 2005
Location: toronto
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An EMI filter does not filter DC. Likely the heater is phase controlling the AC line to control the amount of heat it produces - lots of line harmonics at 120, 180, 240, 300 hz and higher harmonics and your power supplies are buzzing from them. High value cap like 5 or 10 uf X2 rated UL approved line cap might help filter the source if placed near it, but no gaurentees
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