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Old 25th March 2020, 09:45 PM   #1
myleftear is offline myleftear  Switzerland
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ferrite for interconnect...
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Hi friends

I was tempted to build this interconnect: DIY Silver RCA Interconnect Cables

fun and simple to build. It seemed.
But when I started to source the parts, I found that I couldn't just blindly "get parts". The required ferrite-core does not tell much, my source lets me select specific impedances @ frequencies...
So I tried to find out about those details, but found nothing.
Gosh, where could I learn about it!
david
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Old 26th March 2020, 03:31 AM   #2
DUG is offline DUG  Canada
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DIGI-KEY or other suppliers

search ferrites or cable ferrites

Review data sheets

example

https://content.kemet.com/datasheets...005_ESD-SR.pdf

ESD-SR-S10 KEMET | Filters | DigiKey
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Old 26th March 2020, 07:59 AM   #3
Indiglo is offline Indiglo  Australia
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You need to determine what frequencies are to be attenuated, ferrites have different properties and attenuation curves.

Multiple turns of your cable through the ferrite core will improve the attenuation.

The alternative approach is to use shielded cable.
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Old 26th March 2020, 08:43 AM   #4
analog_sa is offline analog_sa  Europe
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ferrite for interconnect...
And don't forget to listen with and without the ferrite, you may be surprised.
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Old 26th March 2020, 09:28 AM   #5
Indiglo is offline Indiglo  Australia
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Well, the op may be surprised that it makes no audible difference since the ferrite converts RF energy into heat.
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Old 26th March 2020, 10:20 AM   #6
myleftear is offline myleftear  Switzerland
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Quote:
Originally Posted by Indiglo View Post
... what frequencies are to be attenuated...

... or use shielded cable.
Indiglo, thank you for the direction.
You got to my weak pointówhat frequencies to attenuate. What are the parameters? Does it depend on the environment (how quiet it is) or on the gear (what devices get connected)?
I vaguely remember something about hf interfering with the signal, but there must be more, but what?

And yes of course, shielded cable. I wanted to see (well, hear) what it was about those claims about the shield (some inductance or something) interfering with the signal.
Iím pretty sure I wonít hear any difference, but as long as I havenít heard it I donít know.
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Old 26th March 2020, 11:00 AM   #7
Indiglo is offline Indiglo  Australia
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It's good that you ask these questions, typically cable clamp-on ferrites are used to attenuate RF energy for either ingress or egress type arrangements, as an example you may see round cylindrical mouldings on consumer products like these to reduce EMI radiating from the cable.

An another example which would be more appropriate if you had a radio amateur with a high powered HF radio transmitter living close by and when transmitting may induce RF energy into your audio inputs via the interconnect cables. Fitting a ferrite clamp to the cable will reduce the amount of RF energy entering the audio device by converting it to heat.

I suggest if you are not experiencing any type of radio interference in your audio devices all you really need to use is good quality shielded cable. No need to spend large sums of money, do a search for Belden shielded audio cable.

Capacitance and inductance in cables is mostly negligible for most devices except for connecting a phono turntable to a preamplifier where you want low capacitance cable.

Last edited by Indiglo; 26th March 2020 at 11:23 AM.
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Old 26th March 2020, 01:11 PM   #8
Speedskater is offline Speedskater  United States
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From an interference prospective that's about as poor of an RCA interconnect as you can get, so a ferrite will be helpful.
Go back to a manufactured coax cable with a heavy braided shield.
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Old 27th March 2020, 07:22 AM   #9
Indiglo is offline Indiglo  Australia
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The op didn't state they had interference, there's absolutely no need for coax unless you live next door to a 10kw radio transmitter and then the ingress of RF is probably via another mechanism in any case.

Belden shielded audio cable is all is required anything else is a extravagant waste of money.
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Old 27th March 2020, 12:58 PM   #10
Speedskater is offline Speedskater  United States
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Quote:
Originally Posted by Indiglo View Post
The op didn't state they had interference, there's absolutely no need for coax unless you live next door to a 10kw radio transmitter and then the ingress of RF is probably via another mechanism in any case.
Belden shielded audio cable is all is required anything else is a extravagant waste of money.
Jim Brown an AES EMI/RFI expert thinks that there are about 30 RFI sources in a typical modern home.
All RCA interconnects should use a coax cable.
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