Ferite core?

[Ivan Vegvary]

Just purchased a 12 volt adapter for my CPAP breathing machine. It consist of a cigarette lighter male plug on one end and a 3.5 mm plug on the other.. However, each line has a heavy, hefty cylinder thereon that I believe is probably a ferite core. What's the purpose of these things?

Thanks, Ivan Vegvary

 

[ehsjr]

Ivan Vegvary wrote:

Just purchased a 12 volt adapter for my CPAP breathing machine. It consist of a cigarette lighter male plug on one end and a 3.5 mm plug on the other. However, each line has a heavy, hefty cylinder thereon that I believe is probably a ferite core. What's the purpose of these things?

Thanks, Ivan Vegvary

From your description, those are for EMI suppression.

Ed

 

[Sjouke Burry]

Ivan Vegvary <ivanvegvary@gmail.com> wrote in
news:27929501.536.1317775373580.JavaMail.geo-discussion-forums@prma7:

Just purchased a 12 volt adapter for my CPAP breathing machine. It
consist of a cigarette lighter male plug on one end and a 3.5 mm plug
on the other. However, each line has a heavy, hefty cylinder thereon
that I believe is probably a ferite core. What's the purpose of these
things?

Thanks, Ivan Vegvary

Stopping high-frequency interference from leaking in or out.

The cable otherwise will act as an arial.

 

[Phil Allison]

"Ivan Vegvary"

Just purchased a 12 volt adapter for my CPAP breathing machine. It consist
of a cigarette lighter male plug on one end and a 3.5 mm plug on the other.
However, each line has a heavy, hefty cylinder thereon that I believe is
probably a ferite core. What's the purpose of these things?

** To reduce AM radio interference.

Even without them, not much would escape to the outside world if used inside
a car as intended - but easily enough to ruin AM radio reception in the
same car in weak signal areas.



..... Phil

 

[Winston]

Phil Allison wrote:

"Ivan Vegvary"

Just purchased a 12 volt adapter for my CPAP breathing machine. It consist
of a cigarette lighter male plug on one end and a 3.5 mm plug on the other.
However, each line has a heavy, hefty cylinder thereon that I believe is
probably a ferite core. What's the purpose of these things?

** To reduce AM radio interference.

Even without them, not much would escape to the outside world if used inside
a car as intended - but easily enough to ruin AM radio reception in the
same car in weak signal areas.

The primary reason is probably to protect the CPAP
from the highest frequency conducted emissions
produced by the car power system.


--Winston

 

[Phil Allison]

"Winston the Wanker "

The primary reason is probably to protect the CPAP
from the highest frequency conducted emissions
produced by the car power system.

** Insane CRAP.

Piss off - fool.



..... Phil

 

[Winston]

Phil Allison wrote:

"Winston the Wanker"


The primary reason is probably to protect the CPAP
from the highest frequency conducted emissions
produced by the car power system.

** Insane CRAP.

Piss off - fool.

That's better. Thanks Phil.

--Winston

 

[Rich Grise]

Sjouke Burry wrote:

Ivan Vegvary <ivanvegvary@gmail.com> wrote in

Just purchased a 12 volt adapter for my CPAP breathing machine. It
consist of a cigarette lighter male plug on one end and a 3.5 mm plug
on the other. However, each line has a heavy, hefty cylinder thereon
that I believe is probably a ferite core. What's the purpose of these
things?

Stopping high-frequency interference from leaking in or out.
The cable otherwise will act as an arial.

AARGH! _AERIAL_. "Arial" is a font.

And, yes, they're to keep the ambient electromagnetic noise out of the
circuit. ;-)

Hope This Helps!
Rich