Questions tagged [cables]

Questions about cable types, properties, ratings and construction.

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8
votes
2answers
2k views

why is there dark fiber? [closed]

Dark fiber (unused fiberoptic cables) is a confusing term for me. Why would any company build so much excess capacity? Such a business decision seems unwise. There are even companies that brand ...
1
vote
1answer
45 views

How to strongly fix N-type connector to thick RG cable?

Can someone tell me what kind of solder or conductive hardening paste is used here to fix the inner conductor of the cable to the pin. I tried soldering of the pin to such cables with tin, but this ...
12
votes
1answer
2k views

Why must USB low-speed devices use a captive cable?

The USB 2.0 spec says: "A low-speed device is required to have a captive cable." However, I can't find a good explanation for why this is the case. I have seen hints towards two possible ...
4
votes
4answers
2k views

75 Ohm Coaxial Cable Used On a 600 Ohm Output

I'm working on restoring an HP 211A square-wave generator and I'm looking to add a shielded cable to the 600 ohm output. I've got some spare 75 ohm RG59 cabling and I was wanting to know if using that ...
0
votes
2answers
63 views

How to choose cables for different amps

I am trying to make a diagram for caravan electric system.As a part of it I have to recharge my batteries from shore/main current. I am thinking of using 230Ah AGM batteries. I will use a 30A 12V ...
0
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1answer
45 views

Laying of underground AC cables

I would like to ask, which one is the best way to lay underground low voltage (400V) AC cables, flat or triangular formation. The application that i am interested in is a photovoltaic plant. The ...
0
votes
1answer
70 views

Can you use cat 5/6 ethernet cable to power devices?

I'm not interested in PoE, I don't need data transmission in this project I'm interested only in the wires inside an ethernet cable I want to wire several devices (ESP nodes) all over my house. I can'...
0
votes
2answers
38 views

What is the B5 pin for USB-C cable? Something wrong with Wikipedia?

On Wikipedia there seems to be inconsistency between the first and second tables: the first table says that B5 pin is for Configuration Channel, while the second table says that the B5 pin is for ...
0
votes
1answer
53 views

Cross section of a cable

The table below, gives some parameters of DC cables: Based on the table above, the average diameter of the first cable (1x2.50) is 5.1 mm. As far as i know the cross section can be found by the ...
17
votes
2answers
3k views

Is there a minimum length for SATA cables?

Today I stumbled across a piece of information that surprised me. Apparently there is a minimum cable length for SATA. From Seagate, a reputable manufacturer of SATA devices: Serial ATA (SATA) data ...
1
vote
1answer
49 views

Coax Cable Wave Impedance, Capacitive Load

I am studying the behaviour of cables over frequency, especially what a source sees, and have 2 Questions, as I did some simulations in LtSpice. As a model for the cable I used the "Lossy ...
0
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2answers
82 views

I accidentally bought an HDMI (male) to VGA (male) cable that isn't an adapter or converter of any sort. Does this product have any value? [closed]

I have a laptop with an HDMI port. I have a monitor with a VGA port. I wanted to connect the two. The website I bought this cable from labeled it as an 'adapter' so I assumed it would do the ...
0
votes
0answers
38 views

Bundling HDMI cables and power cables: can it stand the RF?

I need to run a large number (12) of HDMI cables along with some AC power cables (two, for monitor power.) I was hoping to be able to put them all together into a sleeve to make them more manageable. ...
1
vote
1answer
145 views

What is the name and schema of the 5-pin connector

I have on my ebike this type of connector. Do you know what is the name and schema of it? Edit1: The eBike is LeaderFox 2020 Altar. The cable is from TFT 860c display to the Bafang M500 engine.
2
votes
5answers
2k views

Coax cable - capacitive load

I still have an understanding problem with impedance matched coaxial cable and its behaviour. We do impedance matching to prevent reflections. How does my signal source see the whole cable? At a ...
0
votes
1answer
25 views

Micro USB b connection detector

Is there a way to detect if there is a Micro USB B cable physically inserted into a micro USB B receptacle, even if it is just a cable (with nothing attached to it). in android device
1
vote
1answer
49 views

Understanding cable standards for low voltage conductors in high voltage environments

I am currently getting some custom cables made and having a serious communication issue with several cable manufacturers. I want several low voltage (5V DC) insulated conductors in a jacket that can ...
1
vote
2answers
62 views

Can i use welding cable as primary coil for Tesla coil?

I am trying to make DRSSTC (see NOTE1) and struggle to find copper tube for my Tesla coil, so I'm looking for other stuff that I can use for the primary coil. Now I think, can I use welding cable like ...
1
vote
1answer
25 views

How to tell flat flexible cable(FFC) alignment when inserting?

I have an MSR with an 8 pin FFC with contacts on one side. I don't know if there is a top and bottom and if so how to tell the orientation. There is writing on the contact side I assume to indicate ...
0
votes
2answers
57 views

Noise when using SPI LED driver on 2m cable?

I've made a 2 letter 7 segment display using this LED driver https://www.st.com/en/power-management/stp16cp05.html when I connect it with a 10-20 cm cable to my MCU board it all works OK, but fails ...
7
votes
2answers
255 views

What are the effects we need to consider when transmitting extra low voltage (0.1 uV) signal over ~1m long cable?

What are the effects we need to consider when transmitting extra low voltage (0.1 uV) signal over about 1 meter of cable, either coaxial or shielded twisted pair ? The source is low impedance (~5 ...
0
votes
1answer
39 views

Custom Cable Prototype and Manufacture

I am building an electronic device that has a cable attached to it. I am able to design and order a PCB. I am able to get the PCB assembled with parts. I believe I have enough information to order a ...
0
votes
0answers
43 views

Use USB-C alternate mode pins for custom signals?

I am working on a product that is made of 2 parts: a host with a male USB-C connector and a device with a female USB-C connector that plugs onto it. The plan is to use USB-C because it's a nice ...
0
votes
3answers
121 views

Is the maximum rated current of the cable the same for any voltage?

Cat5e cable has a rated current of 0.577A (wiki page). I am wondering if this is voltage dependent? I am almost certain it is not, but if it is, something might blow up. Say I need to get 2A at 5V ...
2
votes
1answer
51 views

Searching USB cable with 4-pin connector

I am trying to find this USB-A-to-4-pin-connector-cable, which is used quite widely for those USB 2.0 camera modules, e.g. this one. I need that cable to be longer than the one they ship, something ...
0
votes
1answer
52 views

can I use DC battery cable rated at 600A to connect a 63A main AC breaker to a 40A RCCB in my distribution panel?

I've read that for low voltage (less than 400V) applications, that the main difference between DC and AC wire is basically in the (temperature) rating of the cable sheath. If this is true, then the ...
2
votes
2answers
143 views

Do all USB cables have power lines?

I have a USB type A to type B cable, I took it from a printer. Now, I want to utilize this USB cable to make a 5V breadboard power supply. I will cut the cable and connect power lines to breadboard's ...
2
votes
2answers
73 views

Using 2x CAT6 cables for 3D Printer Hot End

Question was previously posted on 3D Printing Stack Exchange who recommended that I repost my issues here. I'm looking to replace the troublesome ribbon cable of my Duplicator 6 with a 2x CAT6 ...
0
votes
0answers
60 views

How to connect a home to the government electrical network

I want to connect my home to the government electrical network, I used twisted cable, my home is 200m meters from the nearest electric pole. How do I calculate the twisted cable section?
0
votes
1answer
58 views

Extension cord to Power strip in old house [closed]

I live in a old house that has very old wiring. We got a small upgrade so we now have grounded outlets. I need to plug in a lot of devices into this outlet such as speakers, monitor and a gaming ...
0
votes
1answer
37 views

TRS connector for noice cancelling headphones has 5 wires inside cable, instead of 4

Scenario: 3.5mm TRS audio connector on a pair of Panasonic RP-HC200 Noise Cancelling headpohones is damaged, so I cut it off and I'm going to replace the connector from another pair. After cutting and ...
0
votes
1answer
62 views

Need to identify cable [closed]

Would need to identify this cable for a replacements: Codes: PF000624.02 KW 1947 38 Data Matrix Code: 1STHGCW0020P42 Pins: 15 The cable is from DJI Mavic Mini controller (CE version) ant it ...
0
votes
1answer
90 views

Soldering USB contacts - what kind of solder tip and what temp?

I am going to try and make my own mechanical USB cable. For soldering the wires to the usb plug, what is the recommended Solder tip type/size and also what is a good temp to use?
1
vote
0answers
64 views

Wiring problem while making couple of USB Type-C cables

1. USB TYPE-C to USB 2.0 Standard-A Cable Found this TYPE-C connector parts w/ 56k resistor from taobao, but there is no detailed circuit diagram on it. I want to make USB TYPE-C(device) to USB 2.0 ...
0
votes
2answers
34 views

How can I identify specifications for this possible passive speaker with subwoofer? And what are each wirings on that cable for?

From Reddit https://www.reddit.com/r/techsupport/comments/g5aynj/can_someone_help_me_identify_the_specifications/ I tried to get specifications of a speaker. This one here is specifically for ASUS ROG ...
0
votes
1answer
75 views

What is the meaning of “400 kHz when other system delays permit?”

I am going through the datasheet of the P82B715 I2C extender. The datasheet says "400 kHz when other system delays permit." What does this mean? (In the Texas Instruments datasheet they do not ...
1
vote
0answers
52 views

Cable tray width selection as per NEC 392

I would like to ask if anyone know what is the meaning of the letter b used in the formula in the table 392.22 National electrical code 2017 article 392, pic (attached)
14
votes
4answers
4k views

Are there any advantages to using rigid RF coaxial cables?

While watching this Signal Path video, I came across this shot: I saw few rigid coaxial cables there and so I started wondering what might their advantages be. I could only find disadvantages: They'...
2
votes
1answer
163 views

Why isn't this ribbon cable between two board-to-board connectors working?

I wanted to connect 2 boards that normally sit on top of each other so I could separate them. To that end I got a 7x2 pin connector cable with the right (2mm) pitch (there was no M/F for that pitch ...
-2
votes
1answer
43 views

What's the difference between ethernet and serial cable?

I am confused about the difference between ethernet and serial cable? Do they do different things or not? If so, what's the difference? Also, I would like to know the cable that is suitable for long-...
1
vote
1answer
81 views

VGA to Composite conversion cable

I'm not able to obtain an adapter from local markets for vga to composite video output. Found a circuit [VGA to composite circuit. Does it work?] that claims to work. I didn't had a vga cable so I ...
2
votes
2answers
85 views

Figuring out ground in AC circuit

I'm currently trying to change my lamp in my bathroom so I disconnected my current lamp and forgot to write down what the cables were attached to. There are 3 cables coming out from the ceiling. <...
0
votes
0answers
34 views

Why should we use the line voltage instead of phase voltage when we are calculate the charging current?

Why should we use the line voltage instead of phase voltage when we are calculate the charging current? I mean: Charging current \$I_C=2\pi f C V=2\pi f C \frac{V_L}{\sqrt{3}}\times 10^{-6}\ \text {A/...
0
votes
1answer
29 views

what glue should i use when making 5, 12 V connectors (plugs)?

At the moment I'm making 5.5 x 2.1 mm DC connectors. The connectors are typical solder lug types like you'd find at the big online stores. I'd feel better about these if I could insulate the lugs -- ...
1
vote
1answer
58 views

Is it possible to make my own charging cable? [closed]

I have a heart rate monitor that uses a proprietary charging cable - that I have misplaced. The charging area looks like this: Is it possible to use an existing micro-usb cable and hack it to make ...
1
vote
1answer
46 views

Fixing the pins in a flex cable

This is a flex cable from a kindle that connects the motherboard to the lcd. The pins at the edge are broken and not making any contact with the connector. Is there any salvation for this? If there's ...
2
votes
2answers
64 views

EMC - conducted emissions - unused wires in cable - puzzling coupling

I am trying to understand the impact of unconnected wires in a cable for EMC conducted emissions tests. My product has a shared unshielded cable for supply and communication (I know it's bad practice....
1
vote
1answer
31 views

Data + Power connector and cable suggestion

I need to decide about how to connect two custom designed electronic units. One is main (execution) unit, and the second is hand-controller unit. Those units have to be connected by wire. The ...
0
votes
1answer
76 views

Is it possible for an HDMI cable to be “worn in”?

I have an HDMI cable running thirty feet between my computer and a TV. I've had various problems with the screen flashing, stuttering, etcetera, due to the signal not being strong enough to carry a 4K ...
-1
votes
1answer
38 views

What size mains cable do I need? [closed]

AC230V with 720W load. Can I get away with 0.75mm 3 core flex with a 5amp fuse or would I be better off with 1.5mm?

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