Have been looking at some retail power line filters like Furman, Panamax, Tripp Lite but most filters under $200 do not have common mode noise filtering. The only one I have found so far is the Furman Elite 20 which is $1200. No thanks.
Is this real or am I not looking hard enough ? Anyone know of any power line filters that include common mode filtering, preferably under $150.
Is this real or am I not looking hard enough ? Anyone know of any power line filters that include common mode filtering, preferably under $150.
At that rate it would be worth making your own with a pcb.
I used to design filters and bought in the components and pcb for less than £30.
Obviously a lot depends on the power rating you need.
RS and Farnell sell smaller common mode chokes, I have used them in SMPS.
I used to design filters and bought in the components and pcb for less than £30.
Obviously a lot depends on the power rating you need.
RS and Farnell sell smaller common mode chokes, I have used them in SMPS.
Personally I would be interest to know what are the side-effects which caused the need for an common-mode noise filter?
Do you have any large motor running in there?
Do you have any large motor running in there?
The choke inside an IEC can filter is the common mode filter.
It even works in both directions because they fit line to line capacitors before the choke and after the choke.
The can filter attenuates interference going into the equipment being fed by the can and also attenuates the interference that the equipment generates and tries to pass back out into the mains cable.
These IEC can filter are available in sizes that I use from 1A to 6A and are relatively cheap.
Every SMPS must meet interference standards. One of these requirements is a limit on the interference emitted back into the mains cable.
This usually DEMANDS that a filter be incorporated into the mains feed into the SMPS.
This is usually both a differential and a common mode filter.
It even works in both directions because they fit line to line capacitors before the choke and after the choke.
The can filter attenuates interference going into the equipment being fed by the can and also attenuates the interference that the equipment generates and tries to pass back out into the mains cable.
These IEC can filter are available in sizes that I use from 1A to 6A and are relatively cheap.
Every SMPS must meet interference standards. One of these requirements is a limit on the interference emitted back into the mains cable.
This usually DEMANDS that a filter be incorporated into the mains feed into the SMPS.
This is usually both a differential and a common mode filter.
This is great.... I am in the middle of no-where - Nepal- Kathmandu and in a home.... it still works here, too. OK OK. You need to know the type of noise you would need to filter. That is, what type of noise is on your power lines -- diff or common mode. And the frequencies. Then you can design an appropriate filter for your lines.
How will you determine/measure which type you have?
THx-RNMarsh
How will you determine/measure which type you have?
THx-RNMarsh
Lots of motors in the house - a/c, fans, refrigerator , washer, dryer....
Is there a way to find out if common mode noise is present on the power line ?
Basically there is no chance for incoming pollution due the power company, the power company does the distribution due small transformers which covers one city block or two.
From the other hand any electrical equipment in your home should have their very own filter, for example all power drills has their own capacitor so to eliminate pollution and noise due their carbon pads.
The same thing happening with a/c, washer, but a cheap dryer it can cause temporarily disturbance due it poor design.
Well a bit of hum noise when the amp volume control is at 70% is normal and expected.
But for a true test you need a pair of RCA plugs with a pair 600 Ohm resistors, you will create termination resistors which will be placed at R&L inputs of the CD input for example.
Only then you can test the amp alone.
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