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In Reply to: Ping Jon Again On The DIY AC Power Line Filter posted by diyaudiophile on February 10, 2007 at 23:30:31:
If you measured this without a load present, then what you are measuring is the capacitive voltage divider action of the filter caps, modified slightly by the fairly high load impedance of your AC voltmeter.In other words, the measurement is not a "real world" measurement, it is a false indication of the voltages.
Try plugging in a lamp or an audio component (preferably an entire system), and then measure the voltages. They should be more along the lines of what you expect. Note that the N to E voltage is hardly ever zero, there is almost always SOME reading, which could amount to several volts. However, it should not be very high (say into double digits) with a load present.
Follow Ups:
Dear Jon,Thanks for your quick reply.
Your explanation is right. When the filter is connected to a CD player, the voltage between L-E and N-E becomes normal.
I have one more question for you. For my CD player and DAC, I do not connect the earth wire to them. Will the filter be less effective under this situation ? Also do I still need the capacitors between Live wire and Earth wire (C1), Neutral and Earth wire (C2) in the filter?
Thanks.
If you are using the AC Line Filter exclusively with two prong equipmment, the filter effectiveness will not be adversely affected.C1 and C2 should remain, as they short to ground any EMI/RFI riding on either the H or N lines.
:-)
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