What does this symbol mean? - Electronic Circuits Projects Diagrams Free

DJ_ReL@X! · 23rd October 2004, 06:38 PM

I would like to know what that L1 symbol means. In the list of materials it is called "Common-mode line filter". How do I construct it? :?:

williB · 23rd October 2004, 07:18 PM

how many mHenrys does it call for

DJ_ReL@X! · 23rd October 2004, 07:39 PM

williB · 23rd October 2004, 08:06 PM

the reason i asked was i wanted to get an idea how big it was..
it might be also called a RF Choke...

DJ_ReL@X! · 23rd October 2004, 08:11 PM

Do you know how can i make it?

zevon8 · 23rd October 2004, 11:04 PM

In theory, you could wind one yourself, but you have to be careful. If you want a small size it will involve using a small core. This means possibly having windings in very close proximity, with an insulation failure resulting in a direct short across the mains. This is why many common mode filter coils are wound on separate bobbins, on the same core. You can find lots of coil winding information on the internet, but the effort and cost of getting the parts may not be worth it.

Many companies make what you need. One of the bigger firms is Corcom.
Their products include all the other filter parts, including the capacitors, MOV's, shielding, safety ratings, etc. They sell through most of the electronic parts distributers.

Here is a link to their verision of what you are looking for: http://www.corcom.com/catalog/filters/B/Default.htm

Russlk · 24th October 2004, 01:01 AM

Panasonic makes what you need and Digikey has it (www.digikey.com) part number plk1069-nd, $2.42.

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23rd October 2004, 07:18 PM	(permalink)
williB	how many mHenrys does it call for

23rd October 2004, 08:06 PM	(permalink)
williB	the reason i asked was i wanted to get an idea how big it was.. it might be also called a RF Choke...

23rd October 2004, 08:11 PM	(permalink)
DJ_ReL@X!	Do you know how can i make it?

23rd October 2004, 11:04 PM	(permalink)
zevon8	In theory, you could wind one yourself, but you have to be careful. If you want a small size it will involve using a small core. This means possibly having windings in very close proximity, with an insulation failure resulting in a direct short across the mains. This is why many common mode filter coils are wound on separate bobbins, on the same core. You can find lots of coil winding information on the internet, but the effort and cost of getting the parts may not be worth it. Many companies make what you need. One of the bigger firms is Corcom. Their products include all the other filter parts, including the capacitors, MOV's, shielding, safety ratings, etc. They sell through most of the electronic parts distributers. Here is a link to their verision of what you are looking for: http://www.corcom.com/catalog/filters/B/Default.htm

24th October 2004, 01:01 AM	(permalink)
Russlk	Panasonic makes what you need and Digikey has it (www.digikey.com) part number plk1069-nd, $2.42. __________________ see my website: www.geocities.com/russlk