Questions tagged [cables]

Questions about cable types, properties, ratings and construction.

Filter by
Sorted by
Tagged with
11
votes
2answers
9k views

Noise (capacitance-related?) in serial signal

The "executive summary" pictures: I want to decode the serial signal coming out of my tablet's headphone jack. This is a somewhat weird "hack" that exists in a few phones and tablets: basically, if ...
10
votes
5answers
2k views

Why don't we use 7075 aluminum Ethernet and USB cables?

Since the skin depth of copper at 1Ghz is about 2.3 micrometers, it doesn't seem like aluminum would provide a worse signal to noise ratio. 7075 aluminum is also much more resilient and stronger than ...
9
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 ...
9
votes
4answers
22k views

Why is USB cable maximum length is shorter than in RS232?

Why do we need to buffer USB signal if the cable is longer than 5m? Is that because a signal voltage drop? Is that because it drives currents?
9
votes
1answer
65k views

Wiring diagram for USB-C to USB-A cable?

I make USB cables (USB-A to Mini or Micro primarily), but don't have any experience with USB-C. I would like to create a cable that has a USB-A (2.0) connector on one end, and a USB-C connector on the ...
9
votes
1answer
199k views

How to calculate voltage drop over and power loss in wires

How do I calculate the voltage drop over wires given a supply voltage and a current? How do I anticipate on voltage drop so that the final load has the correct supply voltage? What will be the power ...
9
votes
3answers
1k views

Can I accidentally create a coil with a bunch of isolated cables?

I just finished rearranging furniture in my room and I ended up with a lot of cables next to each other, some of them powering electronics that draw a few hundred watts. Is it any risky - for example, ...
9
votes
2answers
52k views

3 wires on a (bipolar) DC plug - what are they for?

If got this cable as a power plug for my DELL XPS 15. I want to hook it up to a different power source. But what are the 3! wires for on a bipolar plug?
9
votes
7answers
10k views

Why does an XLR connector use 3 pins instead of two

Why does XLR connectors use 3 pins instead of just 2. The wiring is Pin Function -------------------------------- 1 Chassis ground(cable shield) 2 hot 3 cold ...
9
votes
1answer
6k views

What should I know about interference between wires in a multi-conductor cable?

I want to use a multi-conductor cable for a few different circuits. What do I need to know about interference between circuits within a multi-conductor cable? Some of the wires will carry stepper ...
8
votes
8answers
14k views

Sending I2C reliabily over Cat5 cables

I am considering implmenting an home automation system around my Raspberry Pi but I found the price and space requirement of inserting a Pi every place some control is required too much but the Cat5e ...
8
votes
8answers
8k views

How to provide power to a rotating circuit? [duplicate]

I want to build something with my unused fan. I am planning to put a lighting circuit using LEDs and a microcontroller (ATmega, Arduino Nano, or something), thus creating some kind of image from the ...
8
votes
5answers
1k views

Why do AC-to-DC adapters have long cables on both ends?

Why do AC adapters have long cable on both ends? I believe that almost everyone using one would want it either directly next to the gadget it is powering (even possibly joined together with it if ...
8
votes
4answers
3k views

Is it true that when extending a high watt appliance with a extension cord I should use a thicker (higher AMP) cable than the cable of the appliance?

I am an European, so I am not sure if that matters. All I know is that I need a cable with the right amp or wattage throughput capability. Our cables are named as 3x1.5, 3x2.5, 3x3.5 etc, I guess ...
8
votes
2answers
14k views

How does a coaxial aerial cable work?

My family and I managed to break the aerial cable of our TV a few days ago. The cable is of this kind of design: And I believe its called a coaxial cable. Fortunately, someone more practical than ...
8
votes
5answers
13k views

Does the color of Jumper cables matter?

Does the color of jumper cables in a circuit matter? I'm starting out with Arduino and can't get it to work at all with a breadboard! I'm thinking it's something simple like this! I know Black is ...
8
votes
2answers
10k views

What does the "RG" in coax cables mean?

For instance RG-6, RG-58, RG-59 and RG-173? Also do the numbers have a specific meaning (like referring to a part of the specification)? Is there a document that lists all RG-* cables with their ...
8
votes
2answers
1k views

Looking for a board-to-board cable

I am wanting to connect 2 boards together with a cable. I want the connectors on the boards to be surface mount and have clips to hold the cable onto it. I need about 8 - 10 pins. I don't want to ...
8
votes
4answers
1k views

Is there any benefit to using twisted pair for short-distance I2C?

I know twisted pairs are important for differential signals, which I2C is not. I also know I2C is not intended to be used over long wires. However, I made a design where I need to use a cable to ...
7
votes
7answers
3k views

Cable standard for data and power

I am looking for a cable standard to control and power a device from its controller. I need to send 5V/10A but also control (not sure yet what protocol it could be but I don't need a high speed, 9600b ...
7
votes
3answers
24k views

Bad effects of coiling electrical cables [duplicate]

I have a desktop computer and a lot of external hard disk cases. I coiled all cables to make them organized and easy to clean. But an electrician told me; if you are using a cable, coiling (wrapping) ...
7
votes
3answers
62k views

How to determine appropriate speaker cable gauge?

When wiring speakers to a 100W consumer-grade amplifier, how do I select an appropriate gauge cable (for 8-ohm speakers)? Also, if 14 gauge cable is sufficient, what harm is there in using a heavier ...
7
votes
4answers
732 views

Why ship a low power charger with an overkill thick cable?

Today I saw a Sony camera charger that claimed to provide 8.4V/1.7A output but had a cable going to the device being powered with 18AWG (0.824mm2) cross-section and insulation rated at 300V (yeap, ...
7
votes
4answers
16k views

Why would high-voltage cables have semiconductive layers in their design?

Turns out a high voltage cable can have semiconductive layers in its design. For example here's a rather old patent covering some specific way of producing such cable. This doesn't make much sense. ...
7
votes
6answers
10k views

Does Fibre Optic Cabling have any potential for noise?

After Google searching "Do Fibre Optic Cables attract any noise", most results return that they attract virtually no noise. Is this the case or are there some exceptions?
7
votes
3answers
3k views

Does a Connector With Multiple GND Pins Make a GND Loop?

There are some cable standards that have multiple GND pins on the connector proper. A good example of this is the SATA connector (it has 3 of them). In reality, each GND pin has a slightly different ...
7
votes
1answer
34k views

How do Tx / Rx cable pairs work in an Ethernet cable?

This question will be a simplification as I lack the proper knowledge. Lets suppose we want to send a signal over the network. We will use this scheme as this is hopefully how the signals are send ...
7
votes
1answer
2k views

Difficulties of I2C over wire

I want to link a PIC16F1825 and a TCN75 temperature sensor via I2C. The temperature sensor is about 1m from the MCU. Can somebody enlighten me on whether and what kind of difficulties I am going to ...
7
votes
2answers
280 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 ...
7
votes
2answers
2k views

PCIe over a short cable

For a new project I need to connect two boards via PCI express. For space reasons a custom cable assembly would be the best solution. But I'm not sure what is the best way to go here. I've seen Riser-...
7
votes
2answers
2k views

Best practices in making cable schematics

I would like to make cable schematics for manufacturing that would include: cable lengths connectors pins conduit length heat shrink tube length and have a BOM for that automatically generated in ...
7
votes
1answer
564 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 ...
7
votes
2answers
793 views

Industry standard measure for coaxial cable stiffness?

Is there an industry standard measure for coaxial cable stiffness? By stiffness I mean the spring force experienced when bending or deforming the cable. In my search for a highly flexible lab test ...
6
votes
6answers
8k views

In a multicore cable, what is the nylon "string"?

I am using 4 core shielded cable. However, there is a strand of what I assume is nylon running parallel to the conductors. A bit like this (source) What is it for?
6
votes
3answers
1k views

Advice on BNC cables for beginners electronic lab

I'm setting up an electronics lab so I can increase my knowledge of electronics. I've bought some equipment of ebay ('scope, power supply, signal generator etc.,) but don't know what sort of BNC ...
6
votes
4answers
3k views

Interfacing a button to a microcontroller (and PC) with a 50 m long cable

I am designing a board that will be plugged into a computer and will read the status of a button ~50 m away in an office environment (it's actually a lot closer, but the cable is long). I think ...
6
votes
2answers
2k views

Does skin effect appear in home wires?

A technician said: Its better to use a solid cables for homes (not stranded cables). I did not use any calculations but I think that stranded cables are better due to skin effect. We use 220V / 50Hz. ...
6
votes
4answers
699 views

What do you call this kind of cable?

I'm planning on building a board with a bunch of logic gates on to experiment with. I'm looking for a kind of cable that I've seen before but don't know the name of. It basically connects to a solid ...
6
votes
5answers
42k views

How to determine the best diameter for a cable?

In my understanding having a cable that has a too large diameter can lead to power dissipation, having one that is too small can lead to the same result. apparently the second case is much more ...
6
votes
3answers
5k views

Is unshielded untwisted pair cabling fine for audio?

Noob here just trying to work out if there's much difference between the various types of cabling for use in connecting amps to speakers. I have unshielded untwisted pair cabling here at the moment.
6
votes
3answers
4k views

Does USB Power Delivery handle USB cables that are not PD-aware?

I think USB-PD is still fairly new (I don't know anyone who owns a device that has it) but reading wikipedia and info sites does not make it clear what happens when you use a cable that is out of spec ...
6
votes
2answers
496 views

Design considerations for powering microcontrollers with a 100 m cable

I'm currently doing some research for a project where I'd have a number of microcontrollers (say 5 ATtinys or if I manage to bring power consumption down, maybe even ATmegas) which I want to power ...
6
votes
1answer
1k views

Running network cable near X-Ray equipment

My mother runs a small veterinary clinic. She is getting a new X-Ray machine that will need a network connection to send digital copies of the X-Ray to the server. I will be installing a wall plate ...
6
votes
4answers
2k views

Long three cables connection: can I use an audio stereo cable?

I'm building small project where I need to connect a few sonar sensors to an Arduino. Each of these sensors are connected via 3 wires to the arduino. My problems is that I need to place these sensors ...
6
votes
2answers
1k views

How good is coaxial cable?

My question relates to the accumulated AC voltage that will appear on the screen of a length of coax: If the cable is properly terminated at one end and fed with data (or any signal) at the other end,...
6
votes
2answers
2k views

Ethernet shielding termination

With regard to termination of ethernet shielding I have been taught always to terminate only ONE end of the shielding to ground to prevent ground loops occurring. Is this best practice? and is there ...
6
votes
3answers
13k views

Why is Cat5/Cat5e Ethernet cable rated 100MHz?

As the questions says, is there any specific reason why Ethernet cable is rated 100MHz? For a 100Mbps Ethernet the data rate is 100Mbps, and the baud rate is 125Mbaud, because of the specific line ...
6
votes
3answers
391 views

Wire for harsh environment

One of the jobs I often have to perform is repairing the infra-red sensing headsets for BattleSports equipment. Basically the headset consists of a pair of IR detectors and red LEDs for indication. ...
6
votes
2answers
3k views

What is the most common type of high voltage cables?

I'm building the model of an admittance matrix for the German Grid, most specifically the Transmission grid. I only have characteristics of cables as number of cables, wires and voltage (I'm working ...
6
votes
2answers
3k views

Coaxial cable, resistor and oscilloscope

I'm studying the trasmission of signals though coaxial cable; I'm using a coaxial cable (of course!), an oscilloscope, a generator an some different endings. This is the scheme: I was told that if I ...

1
2
3 4 5
17