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Old 18th March 2012, 02:41 PM   #1
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Question how to eliminates AC spikes

I have a dedicated/separated AC mains for my audio system, when I use my BIII DAC I have AC spikes that causes dropouts, I know that AC spikes are caused by central heating when starts the heating, I remember that I can connect 01,uF 400VAC in the AC inlet where is connected the central heating but don't remember if I have to connected between hot & neutral or other way, could you help me?
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Old 18th March 2012, 02:51 PM   #2
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If the spikes are that bad you ought to think about a proper filter rather than just a cap.

Are you sure it is a spike, and not a short brownout?
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Old 18th March 2012, 03:19 PM   #3
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Yes I'm sure it's an AC spike because occurs when I hear the temperature controller central heating starts. I use John's Risch AC power conditioner filter. What's a brownout?

Last edited by merlin el mago; 18th March 2012 at 03:26 PM.
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Old 18th March 2012, 03:36 PM   #4
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Quote:
Originally Posted by merlin el mago View Post
Yes I'm sure it's an AC spike because occurs when I hear the temperature controller central heating starts. I use John's Risch AC power conditioner filter. What's a brownout?
A brownout is when you have a voltage drop on your main A.C. line. A blackout is zero voltage - a brown out would be like dropping the voltage of a 120 VAC line down to 80 - 100 volts. Often a large electrical load being switched on will cause this for a short duration.

We used MOV varistors to protect against dangerous spikes http://electroschematics.com/5224/metal-oxide-varistor/

But for line spikes in critical situations we would use isolation transformers.
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Last edited by c2cthomas; 18th March 2012 at 03:40 PM.
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Old 18th March 2012, 03:38 PM   #5
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A brownout is a temporary dip in mains voltage, sometimes caused by the switch-on surge in an item on the same feeder if the supply has too high a resistance. Spikes are more likely when something switches off.
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Old 18th March 2012, 03:41 PM   #6
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Isn't a brownout: I measured AC with my DMM always 231VAC, the BIII unlock.

Last edited by merlin el mago; 18th March 2012 at 03:45 PM.
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Old 18th March 2012, 03:48 PM   #7
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You need a proper mains filter with L and C.
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Old 18th March 2012, 03:53 PM   #8
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You can chain multiple AC line filters.

But if you can, do your modifications on the DC side of the equipment's power supply instead. Besides, from your previous threads, it seems that it is your DAC that isn't reliable to start with. Do you get the same problem with other products?
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Old 18th March 2012, 03:55 PM   #9
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Jon Risch's AC Power Line Filter & Surge Suppresor
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Last edited by merlin el mago; 18th March 2012 at 04:00 PM.
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Old 18th March 2012, 04:01 PM   #10
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