Questions tagged [cables]
Questions about cable types, properties, ratings and construction.
4
votes
1answer
85 views
How should I connect the audio ground and shield wires in a Cat5 cable for analog audio?
I would like to carry 3x balanced line level (not mic level) signals to another part of my living room and I found that the cable space in the skirting boards would not allow 3x balanced cables (XLR ...
4
votes
2answers
567 views
What makes “quality” analog AV cables better than cheap cables? [closed]
I want to upgrade my retro game setup from a mix of composite and RF to a mix of S-video and component, with some composite for the really old stuff that doesn't support S-video. How can I distinguish ...
0
votes
0answers
54 views
Communication between device for 5 meters and low speeds
I need to make a communication between only two devices with a distance of 5 meters, which are connected by a cable of 4x2.5mm² (see in the image), being 1 wire for GND and wire for 12v, that would ...
0
votes
1answer
62 views
Jack for long-barrel plug
I have a DC power cable that ends in a 5.5 x 2.5 mm plug. I purchased a panel mount jack for it, and yes, the plug fits. However, the barrel is much longer than the jack, so the barrel does not fit ...
0
votes
1answer
28 views
TLC5926IPWPR Clock width
I'm using the TLC5926IPWPR in a design. It uses an SPI interface. The TLC5926IPWPR chip is on a separate PCB than the MCU that is controlling it. The Clock and SDO pin must go through a cable about a ...
12
votes
2answers
1k views
Why is current rating for multicore cable lower than single core with the same cross section?
As per this resource, a single core 10 AWG (5.3 mm2) copper cable is rated for up to 52 amps, while the same cross section cable of 43 cores and more is only allowed to carry up to 15 amps.
Why is ...
0
votes
0answers
12 views
TC-ER cable type for U/G installation
Can I use TC-ER type cable for Underground installation.
Underground installation is in PVC conduits (schedule 40). PVC conduits are protected using lean concrete (sort of duct bank)
4
votes
2answers
92 views
Why do long cables measured with a VNA show a “drop” in their attenuation curve?
I'm measuring the attenuation of several cables with a VNA (Keysight N5234A). When I measure the attenuation of long cables (10 m, 30 m, 40 m or 50 m) I realize that a "drop" appears at 500MHz (see ...
0
votes
0answers
53 views
Identification of coax connector
This is the antenna end of the car phone antenna cable in a 1983 Mercedes 300D (w123 chassis). The other end of the cable is the usual UHF connector. The metal part of the connector is 15/32" in ...
-2
votes
0answers
31 views
Can I use 16mm or 10mm DC cable for AC home appliances? [migrated]
I am going to install wiring in my home and I am curious if I can use 16 mm or 2 core DC cable for AC small appliances like fans and TV?
1
vote
2answers
69 views
Ribbon cable pin order
I'm struggling to understand the pin order on a ribbon cable.
I want to connect two boards (one main board with the MCU, the other one for the front panel to pots and buttons) and i need a 2x20 ...
1
vote
3answers
109 views
Sizing welding conductors with 6000A max current
I’m trying to size some welding conductors per the following information.
The welder will be used once a day for 2 seconds only. 6000A of current will be drawn through the conductors during this ...
1
vote
2answers
117 views
A few of my cables don't work. Is it because they weren't shielded properly?
I am learning how to build USB cables as a hobby.
For my early attempts, I did not attempt to shield the cable, I just skipped the bare shield wiring I've seen in other USB cables. However, ...
0
votes
1answer
54 views
Structure of Pairs inside a Cat Cable
Is there a standard arrangement for the pairs inside a Cat7|6|5 Ethernet Cable?
As shown in the picture, they are in the sequence Orange-Green-Brown-Blue, or the Orange Brown always as opposite pairs,...
0
votes
0answers
29 views
Are FPCs or FFCs more resilient to bending/creasing multiple times (~180 degrees)
My company is designing a product that requires a flexible cable. The cable design is almost exactly the same as a headphone cable as seen here
I'm concerned that inevitably some idiot will try to ...
7
votes
1answer
533 views
Why did CATV standarize in 75 ohms and everyone else in 50?
All of the CATV industry runs on 75 ohm systems, while most of the rest of the radio world uses 50 ohms.
Why was this standard chosen?
I was wondering this because good quality RG6 cable can be ...
0
votes
0answers
38 views
What happens to a wave on a coaxial cable at low frequences?
I'm trying to understand the propagation of a sinus wave on a coaxial cable at very low frequences.
But the problem is that I heard some people got a pi/2 dephasing, and some others got no dephasing....
2
votes
1answer
110 views
What is this cable/device?
I hope I'm on the appropriate site.
Does anyone know what this thing is?
It has a mini mono plug.
The white square is slippery..but it is not covering double-sided tape.
A white LED did not light up ...
0
votes
1answer
42 views
Reverse Engineer DIN 5-pin connector
Summary
I have a digitial guitar amplifier that can be controlled via a footswitch. The footswitch is connected to the amplifier via a DIN 5-pin cable. I want to be able to control the amplifier with ...
9
votes
6answers
3k views
Is it necessary to separate DC power cables and data cables?
I have had this discussion with my colleague earlier. A DC power supply is non-alternating, so the magnetic field a DC power wire generates is constant (is it?). Now, I know the rule is to separate ...
0
votes
0answers
28 views
jerky USB keyboard signal
I have made this contraption in order to quickly switch one keyboard between a PC and a laptop:
The keyboard hooks into USB_A and it gets routed to either J1 or J2 depending on the position of a 3PDT ...
0
votes
0answers
41 views
Wifi coaxial cable type unknown
Quick question, I was unable to identify the coaxial cable type used in wifi devices(routers ,tablets,etc.) , very thin grey cable approximately 1mm in outer diameter, I need to know the type so I can ...
1
vote
2answers
103 views
Is it bad practice to connect wires of vastly different gauges?
I would like to connect an Anderson plug with 25mm² cable to a 12V AGM battery so that I can easily connect and disconnect different devices which will conduct currents of varying amperage. I may ...
2
votes
1answer
101 views
Strongest electrical wire at AWG 24
Is there any ultra strong electrical wire at about AWG24 (0.22mm)? I want something that would be strong as a steel wire rope but also with low resistance that can used as electrical wire.
0
votes
1answer
65 views
Is there a way to terminate a two conductor cable to a BNC plug?
I have a device with a two conductor cable that I need to interface to a signal conditioner with a BNC input (same as that on a standard oscilloscope). I would rather not use a hacky solution like a ...
0
votes
3answers
53 views
RS422 Full-Duplex Cable Shielding
I need to interface two PCBs via RS422 (250kbps) in full-duplex mode (4-wire, 2-twisted pairs 100ft cable). This system will operate in a noisy (CNC) industrial environment, ie, industrial controls ...
1
vote
2answers
44 views
Terminology for flexible cabling on moving loads
Words are escaping me - literally.
What do you call a bundle or loop or coil of power/control cabling that connects to an apparatus which moves, pivots, or telescopes during operation where the ...
0
votes
2answers
67 views
Can I combine and re-split 2 coaxial cables for 2 signals in my home? [closed]
I have an existing coaxial cable running to my modem through the wall outside from my ISP. I bought an external digital antenna that I'd also like to run outside, but I don't want to drill a second ...
0
votes
0answers
25 views
Cable Parameters from Specs Data
From a 2019 specsheet for a i.e. Belden 1583A cable, I can read \$Z_0=100 \pm15 \Omega \$ for \$f=1 \text{MHz}\$, \$\text{VF}=0.7\$, \$\text{R}=93.8 \Omega/\text{km} \$, among maximum Delay, ...
0
votes
1answer
55 views
Is it possible to use the same RJ-45 connector?
Given that the wires are connected to the pins and crimped with a crimp tool; is it possible to "un-crimp" the wires such that they can be unattached from the RJ-45 connector? Whereafter the connector ...
0
votes
1answer
53 views
Extend smartphone camera outside the device
For a project, I would like to move the camera of a smartphone (Honor 7 in my case) ouside of the device by an extension of some sort.
I have determined that the connectors have a pitch of 0.4mm. The ...
0
votes
2answers
76 views
Avoiding DC voltage drop for surveillance cameras over long distances
Trying to power 2 HD-TVI cameras 800 ft away from my home office.
The wall mounted adapter provides 12v DC at 1 amp. I am looking for a good solution at the lowest possible cost.
There are ...
3
votes
1answer
111 views
Maximum length of high-speed LVDS cable in automotive environment versus using SerDes
I would like to connect a small TFT display that uses LVDS, 4 channels for data and 1 channel for clock. Data rate is maximum 200 Mbps per lane. Very strict EMC requirements are applicable, namely ...
1
vote
3answers
51 views
Is it correct to say that a smartphone cable is only a “1A” cable?
A store owner said that some lower quality smartphone charging cables are only "1A cables", so if you want 2A, those cables won't do the job.
Is it correct to say a cable is only 1A? Does the metal ...
0
votes
1answer
82 views
Regarding Current in CAT 5e cable [duplicate]
Can we supply 2A DC current at 5V in the pair of ethernet CAT 5e cable?
1
vote
3answers
86 views
Are there any traditional colours to use for the wiring in a 4 mA - 20 mA current loop?
I am designing a cable that carries a 4 - 20 mA current loop.
Considerations:
The positive lead is connected to VCC.
The negative lead is connected to a 120 Ω resistor (other end of the resistor is ...
0
votes
1answer
72 views
Cable identification: Euro plug to triangular shape
I recently found a cable near to a TV that didn't fit anywhere and didn't look familiar in any way. It's a Euro plug on the one end, and on the other end it's three contacts in a triangular shape, ...
0
votes
1answer
32 views
Wires coming out of a pigtail cable
There's a audio 3.5mm to pigtail cable on sell at Adafruit:
https://www.adafruit.com/product/1700
It looks like what I need as I could connect one side to an old phone, play some music and the loose ...
0
votes
1answer
66 views
Are these tiny connector pins standard?
I have the following connectors on a USB dongle (the ones on the left of DEBUG):
They are tiny (I put the dongle on an Arduino to show the differences with the ...
0
votes
1answer
98 views
USB C connector design and resistor placement for USB 2.0 data cable
I have a follow-up question to this one.
I have a type C connector with 8 pins. No spec, type C female counterpart reveals G, Vcc, A2, A3, A6, A7. Remaining two pins do not respond to anything. G-Vcc ...
0
votes
3answers
69 views
AC/DC wattage conversion
I've got some common Dutch "huishoudsnoer" (household-cable? Mainly used for powering lamps. Not solid core, 2*0.75mm² cable) laying around, that's rated for 1380 watts. Our wall sockets provide 230V ...
-1
votes
1answer
41 views
what determines bandwidth of a cable i.e. hdmi
I recently bought a cheap 3quid hdmi extension cable for my oculus rift. It's been causing screen tear. I know what cables are compatible now but I'm wondering what affects the bandwidth of a cable?
0
votes
1answer
54 views
Isolating a small pin on a flat cable
A motor on my HiFi system (which is supposed to lift a volume controller) has broken. The motor is stuck and I don't want to fix the mechanical part. I assume disassembling the volume controller would ...
0
votes
1answer
39 views
Copper cable current Gauge calculation
I want to calculate theoretically the current carrying capacity of a cable. I have 24 Awg cable, which is having 8 strands: the overall dimension of the cable is 1.27mm and each strands dia 0.15 mm ...
2
votes
3answers
223 views
Transmit 7MHz analog signal from board to board
I want to transmit real passband analog single ended signal with bandwidth, 0 to 7.3MHz, from board to other board. distance from these board will not be more than 15cm. what's the best choice for ...
3
votes
2answers
73 views
Spiral hoar frost and spiral device around telephone or electric landlines
I live in Germany.
When I travel by train, sometimes there are cables that run from pole to pole parallel to the train track.
From the lack of insulation between wire and pole, I guess these are ...
1
vote
1answer
66 views
“Ideal” way of using 3-conductor cable for unbalanced audio
I am intending to make some short (<30cm) unbalanced audio cables to interconnect devices on a musical instrument pedal board.
As a matter of convenience, I was thinking of using some Belden 9451 ...
0
votes
2answers
82 views
Why does curling a wire decrease its amperage/wattage? [duplicate]
I picked up an extension cord today, and I noticed that it had a different value for its wattage and its ampage, based on whether the cord is wound around its base or not.
(I apologize that the ...
0
votes
1answer
89 views
Replacing a broken 3.5mm audio jack with a different one, why does each cable have different amount of wires?
I found a nice speaker system that seems to work except the 3.5mm audio jack is damaged (it's missing the tip of the conductor for left channel audio). I gathered some broken audio cables with 3.5mm ...
0
votes
1answer
40 views
LC filter applicability for power to output cables
I am designing a circuit that has a 240MHz MCU and some cables going to sensors so I am wanting to reduce the clock noise getting onto the supply line and going out the cables by using an LC filter. ...
