Filtering mains clicks/pops

Ted205 · 19th September 2008, 08:00 PM

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?

cheers

ted

sunil · 30th September 2008, 08:11 AM

Hi,

If it is "Gainclone" specific, these posts might help.

LM3886 very prone to mains noise

loud snaps from other devices switching

Cheers,
sunil

Ted205 · 30th September 2008, 10:08 AM

excellent!

Cheers

Ted

Gordy · 2nd October 2008, 01:05 PM

Also have a read-up on varistor / MOV / voltage-dependent-resistor:
http://en.wikipedia.org/wiki/Varistor

AndrewT · 4th October 2008, 09:07 AM

Hi,
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.

gain · 15th October 2008, 03:11 PM

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!

19th September 2008, 08:00 PM	#1
Ted205 diyAudio Member Join Date: Jun 2008	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? cheers ted

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30th September 2008, 08:11 AM	#2
sunil diyAudio Member Join Date: May 2003 Location: Bangalore, INDIA	Hi, If it is "Gainclone" specific, these posts might help. LM3886 very prone to mains noise loud snaps from other devices switching Cheers, sunil

30th September 2008, 10:08 AM	#3
Ted205 diyAudio Member Join Date: Jun 2008	excellent! Cheers Ted

2nd October 2008, 01:05 PM	#4
Gordy diyAudio Member Join Date: Nov 2006	Also have a read-up on varistor / MOV / voltage-dependent-resistor: http://en.wikipedia.org/wiki/Varistor

4th October 2008, 09:07 AM	#5
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	Hi, 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.

15th October 2008, 03:11 PM	#6
gain diyAudio Member Join Date: Apr 2008	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!