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Old 19th September 2008, 08:00 PM   #1
Ted205 is offline Ted205  United Kingdom
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Default Filtering mains clicks/pops

I get a very annoying click/pop from my speakers when ever a light switch is switch on in the house.

Ive had a search around on the forums but couldn't find anything.

Is it just a case of putting a 100nf capacitor between L and N. Or a capacitor from both L&N to ground?


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Old 30th September 2008, 08:11 AM   #2
sunil is offline sunil  India
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If it is "Gainclone" specific, these posts might help.

LM3886 very prone to mains noise

loud snaps from other devices switching

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Old 30th September 2008, 10:08 AM   #3
Ted205 is offline Ted205  United Kingdom
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Old 2nd October 2008, 01:05 PM   #4
Gordy is offline Gordy  United Kingdom
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Also have a read-up on varistor / MOV / voltage-dependent-resistor:
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Old 4th October 2008, 09:07 AM   #5
AndrewT is online now AndrewT  Scotland
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you gain more by suppressing the interference at source.
Try adding an R+C snubber across the offending switch/motor/appliance.
These are available as integrated units, designed specifically for interference suppression of mains operated equipment.
regards Andrew T.
Sent from my desktop computer using a keyboard
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Old 15th October 2008, 03:11 PM   #6
gain is offline gain  United States
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i have also seen the triacs in dimmer switches inject noise into audio circuits in certain instances, particularly if the audio device is connected to the same circuit the dimmer is on. cure was as Andrew suggested, bypass cap(s) at the source. ime a 0.1uF and/or 0.01uF has worked well.

EDIT: Just make sure the caps you use to do this are mains rated!
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