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Old 4th November 2003, 06:26 AM   #1
MWP is offline MWP  Australia
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Default Mains filtering.

Hi all,

I have a very annoying problem where a bar fridge in the same room as my audio gear is causing very loud pops on my speakers when the compressor turns on/off.

Is there an easy way to fix this?
A mains rated filter cap across the fridge thermostat, etc?

Thanks.
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Old 4th November 2003, 06:46 AM   #2
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Hi!

Try putting a pre-manufactured filter in series to the fridge power line, but pay attention to the power rating.

I always have one or two lying around...


Bye,

Arndt
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Old 4th November 2003, 06:48 AM   #3
mcp is offline mcp  United States
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There is probably a relay that switches the compressor on and off and everytime this happens, the relay contacts arc. Install a "X2" type capacitor across the relay contacts and it should cure the problem. You can start with 0.1uF/250Vac X2. Please note that this will be at mains voltage, therefore the necessary safety precautions must apply. Cheers.
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Old 4th November 2003, 07:05 AM   #4
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Thorsten (Kuei Yang Wang) has a DIY shunt mains filter article out on the www somewhere that you might find helpful. (I couldn't find it on his web site)

dave
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Old 4th November 2003, 07:51 AM   #5
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Quote:
Originally posted by planet10
Thorsten (Kuei Yang Wang) has a DIY shunt mains filter article out on the www somewhere that you might find helpful. (I couldn't find it on his web site)
I have a feeling that you will need a transient filter like a VDR across the live neutral. Size K14 or K20 and 250 VAC, or 115 VAC. Start with a simple and cheap VDR.
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Old 4th November 2003, 08:16 AM   #6
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Additionally take voltage drop into account. Some compressors draw quite a lot of current so it is also advisible to have seperate mains wiring to both outlets where the fridge and the HiFi are plugged in.

Regards

Charles
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Old 4th November 2003, 10:58 AM   #7
MWP is offline MWP  Australia
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Thanks for the tips guys.
Ill have a look tomorrow.... we are just starting to get hot weather here so having the bar fridge on would be handy
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Old 4th November 2003, 05:30 PM   #8
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Quote:
Thorsten (Kuei Yang Wang) has a DIY shunt mains filter article out on the www somewhere that you might find helpful. (I couldn't find it on his web site)
somewhere=tnt-audio.com
Ciao, Massimo
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Old 4th November 2003, 05:44 PM   #9
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Quote:
Originally posted by antomas
somewhere=tnt-audio.com
Thanx for that

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Old 5th November 2003, 05:37 AM   #10
EE_Mark is offline EE_Mark  United States
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Default Pops

The glitch on the power line is causing a pop in your system. There are two ways to approach this: Filter the glitch from the compresor or make the amp immune to the glitch. A combination of the two might be necessary. What kind of power amp? How much power? You might try putting 0.1 uF ceramic caps across the diodes in the bridge rectifier or, if the amp is not high powered, running it through an isolation transformer. Some of the better power strips for computers have some decent filtering in them. One of the power saving devices that you plug refrigerators into to save electrcitiy might even work.
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