"Paul G." wrote in message
...
On Sun, 25 Jul 2010 08:13:20 +0100, "David Looser"
wrote:


You have a cable feed to a CD player?

No..... but the audio system shares a ground with the FM tuner
which has a cable connection.

I guessed it had to be something like that ;-)

The CD player (Linn Karik & Numerik)
would do strange things now and then, until the cable connection was
removed.

That points to poor design of the CD player. Ground-loop hum is one thing,
"strange behaviour" suggests that the items affected have poor immunity to
EM interference.

Our cable must have some pretty weird stuff on it, as many
other audio devices would hum or behave oddly when they shared a
ground with the cable.

Ditto.



There must be a variety of types of "braid-breakers"... Most of what
I see are mentioned on the internet are (ASCII circuit) :

C1
in1-------.-----||------.------- out1
) )
)L1 )L2
) )
) )
in2-------'-----||------'------- out2
| C2 |
| |
| |
'-/\/\/\/\/---'
R1

Yup, when I did an internet search for "braid-breaker" in response to your
post that's mostly what I found too. I couldn't find any commercially
available unit with a transformer which suprised me, as they were certainly
available 20 years ago.

David.