Ferrite rings/beads/chokes have not been my preferred choice in the past. I'm a bit biased against using them on audio signal cables with what I find are deleterious effects. I do find them useful on switching power supplies though and as mentioned before when used on all a/c lines at the breaker box with the exception of the mains coming in and the dedicated lines to the system. I do have a few sitting on some power cables but use them sparingly as I noticed they can blunt dynamics and the high frequencies. Trial and error here.Here is the approach that I have used:
- I use a large isolation transformer on the mains
- My interconnects have RFI draining networks
- I have placed ultra high frequency RC low pass filters in my speaker crossovers, across the drivers and across rhe field coil power supplies.
I have tried and really don't like shielded cables or ferrite rings. I have not tried any grounding boxes.
The did you purchase interconnects with RFI draining networks on them or are the networks custom? Off the top of my mind I can't think of any commercial non-shielded cables with networks on them. I find it an interesting take.
since I was interested in the 3M EMI sheet product you mentioned, I ordered two copies in the 1mm version a year ago.
Datasheet for series 5100 = https://www.mouser.de/datasheet/2/1/846522423eaf927ed1f5720cd4d46e04fa361b66-2951889.pdf
The individual test with the sheets:
The advantage of the DIN A 4 sized sheets is that they can be placed in a variety of locations for familiarization without removing the adhesive foil.
Thus provisional layout combinations (optically visible) can be designed externally: Covering housings of individual components, wrapping short cables, etc. Depending on the size of the components, several sheets may be needed.
Comparisons with vs. without are time consuming, but provide the desired information. For example, on my DAC (sheet metal enclosure) the EMI sheets showed no effect, on enclosures of mono power amplifiers (tubes) a cleaner presentation when combined from the outside in the area of the power transformers.
Should the sheets become advantageous at any position in the system, they can be cut cleanly and then used invisibly inside the housing.
Experiment creates knowledge!
Good success with upcoming projects wishes Rainer
SlapEcho,Just to note - There are multiple vectors of RF radiation, externally (e.g. - Wifi or cellular), and internally within the system component themselves(e.g. - switching supplies, even pcb trace to trace crosstalk).
Nothing super fancy. Just regular adhesive backed tape. It doesn't hold the shape as well as the type you need to heat up, so its a bit more pliable, but for this specific use case it does the job. This one worked well for me. - https://www.amazon.com/HSTECH-Autom...+Wire+Loom+Harness+Tape&qid=1672241843&sr=8-2SlapEcho,
What kind of cloth tape do you use?
I'm using YC industrial cloth tape for Wiring Harness Automotive. I have to heat it with a hair dryer to get it to stick. Ive read other tapes have a similar problem. Thanks!
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