Questions about cable types, properties, ratings and construction.

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5
votes
6answers
704 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 ...
35
votes
7answers
6k views

Why aren't headphone jack shaped plugs used for data?

With Apple's lightning cable, and USB 3.0, reversible cables are taking off, and I personally think this is very convenient. But we have had better than reversible for a long time, in the form of the ...
3
votes
0answers
48 views

Modifying headset's microphone to hear from it? [closed]

Problem? I have a headset with a microphone, like this: Good for you. What do you want? I want to use my headset's microphone as a real microphone. It's already a real microphone, you noob. ...
1
vote
2answers
180 views

Why do laptops' chargers have coaxial cords?

The cord connecting my laptop to the charger is a coaxial cord. It seems to me that other laptops also have the same type of cord. I get that coaxial cords are good for connecting my TV to an ...
1
vote
1answer
68 views

Breadboard Wiring with Seven Segment Display

So I'm planning on building a skee ball machine and as I've been looking into it I've decided to use some seven segment displays from here: As I've looked into this more I know I need a breadboard ...
0
votes
1answer
89 views

How long does it take to receive data from a cable, turn it into bits, then send it back out again? [closed]

I need to read in data off of a fiber optic (or copper, though I figured fiber optic would be faster) cable, convert it to bits, do something with it that should only take a clock cycle or two, then ...
1
vote
1answer
45 views

Can I make a 6-wire cable with 36V, 5A, and USB? [closed]

I'm trying to build a cable for some arcade light guns. The gun has a USB cable, and another 36V, 5A (peak) cable. Can I find a 6-wire cable that can contain both the 4-wires for the USB and the ...
0
votes
1answer
48 views

Modify a kinect - Reconnect the two cards

I’m trying to make a Kinect camera smaller. There was a problem at some point and my client expect me to put the kinect in a vertical position rather than horizontal as it is supposed to be. The ...
-1
votes
1answer
40 views

RCA and S-video Splitter [closed]

I would like to split yellow RCA cable (because I need 2 input cables for 2 tvs/monitors). And do the same for S-video cable. Can I use cheap simple "splitting" cables with one input and two outputs ...
1
vote
0answers
53 views

Shielded cable vs. unshielded in underwater environment

I know basic electromagnetic theory very well and understand why this works but I'm not sure about one thing regarding usage of coaxial (shielded) cable vs. unshielded (normal conductor) cable when ...
0
votes
2answers
53 views

Not recognizing the port [closed]

So I have a gizDuino ATMEGA 644(an arduino clone), yesterday it is working very well and even uploaded some codes into it. But today my computer suddenly don't recognize the port where my ...
3
votes
0answers
45 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 ...
0
votes
1answer
53 views

STM8L discovery board, wires for the breadboard

I don't know if it is the right place to ask, but still I have a STM8L discovery dev board - http://www.st.com/web/catalog/tools/FM116/SC959/SS1673/PF250636 which has very small square male-type ...
0
votes
2answers
80 views

Identification of Power Cable Type [closed]

I've searched and can't seem to figure out what power cord I need to get for this device. On the back it says: Power: Input --> 100-240V, 50/60Hz Output --> 12V-2A 5V-3.5A Thanks in advance.
1
vote
1answer
121 views

What might cause coaxial cable noise?

In my A level physics I recently did an experiment to find what the optimum frequency to send a digital signal through a RG58/U Coaxial Cable is. My results are available on Dropbox. What I found was ...
1
vote
2answers
74 views

Crimp connectors making process review

I'm actually working on a project with several "little" modules. They are all connected to the PSU and the MCU. So I've design interface for each, so I can easily wire everything together. For that ...
0
votes
1answer
128 views

Star quad cable: Why does the white wire have noticeably less resistance?

I ordered the star quad Canare microphone cable, but I do have a question: why is the resistance of the white wire noticeably less than the resistance of the blue and shield? (The blue and shield are ...
2
votes
1answer
116 views

Why DisplayPort cables must isolate the power pin?

I've been investigating why my 2560×1440 DisplayPort monitor and my mini-DisplayPort MacBook Air don't play along, and, it turns out, this is likely due to a wire in the cable that connects the two ...
1
vote
2answers
61 views

Wire-tie cables

Is there a name / specific type for flat-jacketed wires which come tied on consumer product cables (eg. earphone cables, power cables) ? I always collect them from the new products I buy, but I wish ...
2
votes
4answers
168 views

Programming and controlling microcontrollers and FPGA using Laptop (USB port)

Formerly laptops had serial and parallel port and it was really easy to connect laptop to micro-controllers and FPGAs. But USB has its own protocol and its not as easy as parallel port to implement ...
9
votes
4answers
403 views

How is xΩ impedance cable defined?

This is probably a really simple question, but I can't seem to find a definite answer anywhere. I'm guessing 50Ω cable means 50Ω per unit length. What unit length is this? If this is not how its ...
2
votes
2answers
195 views

Arduino Uno and Sonar Sensor - how long can the wire be before performance suffers?

I am setting up an Arduino Uno with a sonar sensor from Maxbotix (http://www.maxbotix.com/Ultrasonic_Sensors/MB7360.htm). The sensor will be powered directly from the Arduino (5V). The sensor needs ...
1
vote
1answer
114 views

Is an RJ45 / 8P8C connector a good way of connecting an Arduino to a simple device / circuit?

I'm creating a two-part, bass guitar-style MIDI controller, where the left hand plays a small fretboard which detects which frets are being played, and the right hand "plucks" strings (actually senses ...
1
vote
2answers
104 views

How do coaxial cables carry information that a TV can intercept and display?

Is there a specification for this? Like, say, at the backside of a cable box there exists a singular coaxial cable that is meant to be plugged directly in the back of the TV. The TV must be set to a ...
12
votes
2answers
253 views

Terminating shielded/screened twisted pair correctly

Theoretically, I can't see a problem if the twisted pair has an end of cable termination that is: - A single resistor (R) that matches the characteristic impedance of the cable placed across the two ...
9
votes
5answers
796 views

Apple power supply: thick AC cable, thin DC cable - why?

Apple power supply consists of a very thick, inflexible AC cable (wall outlet to converter) and a very thin, flexible DC cable (converter to computer): Why? The currents through the cables should ...
3
votes
2answers
169 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. ...
1
vote
2answers
90 views

What kind of cable can be used to power a mobile electric machine running of 6 kV AC?

I'm looking into the specifications of Hitachi hydraulic excavator model EX8000E-6 with electric motor. The spec says the motors are of type HITACHI TFOA-KK and run off AC 6 000 - 6 600 V / 50 Hz, ...
0
votes
1answer
104 views

Can someone identify these cable connectors?

The cable that i have attached in the pictures below need to be replaced. I don't know the names(types) of the two connectors so i need your help. The device i need to connect:
1
vote
1answer
113 views

Where can I buy a thin metal cable?

I need conect two small printed circuit board. I can use any metal cable (what is the correct name for it?) so I buy this. It use the number "NU 30" but I don't find this number in other place and it ...
0
votes
1answer
112 views

cable losses per meter (voltage > 400 and frequencies [50 Hz … 60 Hz])

If I compute I * I * R I obtain the loss of the conductor in Watt. Is this per meter similar to the dielectric loss (see IEC 60287-1-1)? I am also wondering about the loss factor of sheath and ...
29
votes
7answers
1k views

Why were coax cables used for networking?

Often, if older standards become obsolete, it's because they are superseded by newer technologies. In the past networking was done using coax, instead of the twisted pair used today. Why did they use ...
2
votes
2answers
199 views

Why a wave does not enter a cable? Understanding TDR (Time Domain Reflectometry)

I have been doing some TDR (Time Domain Reflectometry) measures which involves sending gaussian pulses through a cable and measuring the s11 (reflection) parameter. In this measure, I could see that ...
1
vote
1answer
116 views

Reflection coefficient VS frequency

I was trying to look for the answer of what I think it should be quite a simple question but I haven't found any nice answer (at least any that has convinced me). Here it is: Through a cable ...
0
votes
2answers
99 views

TV and PC power cords [closed]

I have a Samsung PS43E450 TV (pic here). I lost the power cord. Can I just use the power cable from my PC (since it fits in the slot), or will it blow up?
8
votes
2answers
426 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 ...
3
votes
1answer
124 views

Voltage drop on cable

I was trying to measure voltage drop caused by length of cables. I generated short high frequency voltage pulse (>200kHz, 70V) and compared the voltage on the generator with the voltage at the end of ...
1
vote
2answers
145 views

How do I interface to this flexible flat cable connector?

I've noticed this connector on a lot of boards, and I was wondering if anyone knew where to source them? I can't seem to find them on digikey.com anywhere. What I'd really like is to get a male ...
30
votes
4answers
993 views

Securing electrical cables to holes in enclosures?

Suppose I would like to insert data-cables of varying diameters -- e.g., a cable of 5 mm diameter -- into the 6 mm diameter hole of a plastic enclosure. The wires within the cable are terminated via ...
5
votes
2answers
1k views

How does a ferrite core wire terminator work to reduce EMC?

The following question was asked on superuser: What is that cylinder on cables? How does that cylinder work? As far as I can tell, even if you put one on either end of the cable, any HF signal should ...
1
vote
2answers
72 views

DD50 equivalent?

I've been looking around and can't find a definitive answer, so I figured I'd ask here. I'm completely new to electronics. This past Fourth of July I made a simple firework launcher using DB15 as the ...
6
votes
2answers
312 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 ...
2
votes
1answer
101 views

SMA to rp-SMA cable selection

I need to buy a 6-7m long SMA to rp-SMA cable to connect a Wifi radio unit (2.4 GHz and U.FL connector) and an external antenna ...
3
votes
3answers
717 views

Bring 5V DC 20 meters away

Sorry if my question is stupid but I'm an electronic passionate only during the weekend. I had a talk with a friend, we want to bring the power supply to a box containing a microcontroller inside a ...
0
votes
1answer
79 views

What is Atmel's 2x5 ICSP connector called?

I'm looking for a male connector that fits in the left female connector shown in the image. My goal is to break each lead out to holes on a breadboard. What is that kind of 2x5 connector called? ...
31
votes
2answers
2k views

In a USB cable, is it OK to swap the D+ and D- wires?

I heard that D+ and D- are differential signals, does it matter if I swap them when connecting a USB device to the computer?
2
votes
1answer
203 views

AMW ribbon cable

I'm a software developer with a little hobby project involving an embedded system. I have a debug board hooked up to another printed circuit board. The connection between the two boards is via this ...
1
vote
2answers
474 views

How to identify orphaned power cords?

We are doing a massive purge of "stuff" from home and storage. I am accumulating a large quantity of random, unmarked power cords. Some will have "Nintendo" or "Norelco" on them - so I know to go ...
-2
votes
1answer
191 views

4-pin Hirose connector to BNC

Is there any way to convert n 4-pin Hirose connector to BNC ?? With this camera the the trigger is 4 pin hirose connector. But the trigger from my data generator DG2020A is 2state (0-5V) and a ( BNC ...
4
votes
2answers
202 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 ...