Silicone USB wire flexible as a thin rope

[Coordonnée_chromatique]

Thanks for you enlightments, everything you've wrote seems very true to me 

the mogami 3316 is arrived but 'im not sure if the data can transit in a 0.55Ω/m... conductor 

[tooki]

The DC resistance is not that important for the data transmission. The characteristic impedance does, and that cable doesn’t have one. It might work. It might not work at all. Or it might work up to a certain length.


The DC resistance does, of course, matter for power transfer. Over your one meter cable it might be OK if the camera doesn’t use too much current, but if it’s power hungry or for longer cables it’d be a serious problem. :/

[Coordonnée_chromatique]

The DC resistance is not that important for the data transmission. The characteristic impedance does, and that cable doesn’t have one. It might work. It might not work at all. Or it might work up to a certain length.
The DC resistance does, of course, matter for power transfer. Over your one meter cable it might be OK if the camera doesn’t use too much current, but if it’s power hungry or for longer cables it’d be a serious problem. :/

The wires are too small and power problem has occurred, the camera draws only 116mA but something goes wrong. i've used the shield as GND and two wires for the VCC and it works, i'm lucky this time 
There is a power detection technology with the USB, no ?

[tooki]

It’s possible the camera’s measured 116mA current is just an average, and that it pulls pulses of much higher current, leading to pulsed excessive voltage drop. For example, if the current is momentarily 2A, then the voltage drop would be 1V, which might be too low for the camera, even if it’s just for a few ms at a time.

USB power is a complex topic that I don’t want to attempt to summarize in a sentence. But my guess is that it does not monitor power in the way you’re imagining. But what are you thinking, exactly?

[Coordonnée_chromatique]

It’s possible the camera’s measured 116mA current is just an average, and that it pulls pulses of much higher current, leading to pulsed excessive voltage drop. For example, if the current is momentarily 2A, then the voltage drop would be 1V, which might be too low for the camera, even if it’s just for a few ms at a time.

USB power is a complex topic that I don’t want to attempt to summarize in a sentence. But my guess is that it does not monitor power in the way you’re imagining. But what are you thinking, exactly?

I've seen the power pulses, the leds ring was flashing and the USB ampmeter values were ondulating, i've no time to inverstigate with an oscilloscope and this technology supasess (by far) my competences.
I don't know anything about the camera module but it looks more sphisticated by anyone i've seen before, the camera lens is separated from the led ring by a translucid glue led assembly, it is the best compacity/image quality that i've seen (the good engineering is not always reconized  )

The urgent prototype is here and functionnal, the only originality is the tractrix expension for the wire bending  

[spostma]

What about retractible USB cables?
They use lize cable internally, and are quite flexible (but not silicone).
There are various types being offered, like:
https://nl.aliexpress.com/item/1005006859467089.html
https://nl.aliexpress.com/item/1005006209007555.html

[TimFox]

"Litz" wire is named from the German word "litzendraht" ("woven wire" in English).
However, "Litz wire" in English usually means a large number of individually insulated strands formed into a bundle, used to improve conductance at high frequencies where the skin effect reduces the effective area of the conductor.
Small diameter Litz wire can be very flexible, but it is a nuisance to use since you must join the strands together at each end (typically using a solder pot if the strand insulation is suitable for removal at that temperature).
The same collection of uninsulated strands should be a bit more flexible (without the enamel), and easier to work with.
A good source for Litz wire:  https://mwswire.com/litz-wire/

[tooki]

Actually, nobody says Litzendraht.* Stranded wire is simply “Litze” and litz wire is “Hochfrequenzlitze” (or “HF-Litze”).



*Generally in German, “Draht” means solid wire, and Litze means stranded. So “Litzendraht” is kinda like saying “stranded solid wire”. OK, you can find examples online of stranded wire sold as Litzendraht, but it’s not something I’ve ever heard anyone say in real life, not even a single time — and I studied electronics in German and now do it professionally, in German. I actually suspect “Litzendraht” could even be a back-translation from English or another foreign language.

[TimFox]

The usual etymology of the English term "Litz wire" refers to the German "Litzendraht" as the source of the word.
I don't know if it is contemporary German or not.

[tooki]

The usual etymology of the English term "Litz wire" refers to the German "Litzendraht" as the source of the word.
I don't know if it is contemporary German or not.

After looking at 95-120 year old books on Google Books: It certainly looks as though the etymology is correct, but it’s definitely not contemporary German.

[Coordonnée_chromatique]

Thanks for the idea, i keep it on hand for the prototyes, but the first prototype is great and it increased my treatement quality.
I've used enamelled thin wires for my IEM prototypes in the past, it was the only way to put 3 active filtered transducers in one shell.

[TimFox]

The usual etymology of the English term "Litz wire" refers to the German "Litzendraht" as the source of the word.
I don't know if it is contemporary German or not.

After looking at 95-120 year old books on Google Books: It certainly looks as though the etymology is correct, but it’s definitely not contemporary German.

A contemporary English-language wire vendor's site, that I cited above:  https://mwswire.com/litz-wire/

[tooki]

The usual etymology of the English term "Litz wire" refers to the German "Litzendraht" as the source of the word.
I don't know if it is contemporary German or not.

After looking at 95-120 year old books on Google Books: It certainly looks as though the etymology is correct, but it’s definitely not contemporary German.

A contemporary English-language wire vendor's site, that I cited above:  https://mwswire.com/litz-wire/

OK, and…?

I said the etymology is correct, even if contemporary German has stopped using the word “Liztendraht”.

I found old books documenting that English “litz wire” is derived from the (old) German word “Litzendraht”. So the etymology appears correct. A few German sources from that time also used “Litzendraht” for litz wire, but most had moved to calling it “Hochfrequenzlitze” like we do today. (And other instances were contexts unrelated to electrical wire, where “Litzendraht” meant the wires used to move yarns in looms. So “draht for litze”, not “draht made of litze”.)