Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [shield]

32 questions
9
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4 answers

USB peripheral: connecting USB shield to GND?

I have read through many recommendations articles, and many StackExchange questions, but haven't come up with any clear understanding as there are many conflicting information out there. The simple question is, should a USB shield be connected to…
Marek
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4
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1 answer

Connecting USB shield to system ground

I designed a PCB with an STM32 and a micro USB connector. I put a NUF2042XV6T1G between the connector and the STM32 to protect the data lines. The USB shield is connected to system ground via a 120R@100MHz ferrite bead. The board has a power…
Crazor
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4
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2 answers

Why is shielding effectiveness different for various hole geometries?

I have run into the equation below in various literature/app notes. (example). I have never seen the derivation for such an equation and don't understand why round apertures are more effective at shielding than slot apertures. Could someone clarify…
EasyOhm
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4
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1 answer

Shield in Inner Copper Layer

I have been designing second version of 4 Layer PCB. The PCB has connectors all over the PCB. In the first version, I had Copper Pour (I call it CHASSIS Ground Pour) on the bottom layer which connects SHIELD pins of SD Card Connector, Ethernet…
abhiarora
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3
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1 answer

When does UL allow a user to access the a metal component connected to AC MAINS through a Y capacitor?

This is a 1kV SMPS design and it is considered a PRIMARY CIRCUIT by UL because it connects directly to 120V AC MAINS. It does not expose its 1kV output directly to the user, but uses the voltage internally. Like many off-line SMPS designs it…
Derek Tables
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3
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2 answers

Where do I solder the shield wire on my USB C breakout?

First of all, I'm new to all this so I most probably won't understand complicated explanations. I'm planning to solder a USB-C breakout to my old keyboard's wires, but I'm not entirely sure where to solder the shield cable. I know where I should…
Zammy
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2
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0 answers

Where to connect case/USB shield to PCB ground?

I am currently designing a modular device for signal acquisition and signal generation. This is not a professional/commercial device. I am only building it out of interest and to learn. Nevertheless, the device should behave reasonably concerning…
Charly
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2
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1 answer

Cable shield connection: ground or earth

I have an analog sensor which features 3 wires: power supply +, ground (common for supply and signal output) and signal output iself. Sensor is working in industrial environment. I am using shielded cable. Know that only one end should be connected…
XgN
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2
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2 answers

Altium Designer - Shielding footprint "component clearance" violation

I'm trying to make a footprint for an RF shield. I made a footprint just putting few pads in square shape but the problem is that the Altium report me a "component clearance" violation. How can I solve that?
MrBit
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Why is the induced voltage due to the current of the phase conductor wrapped around the shield not included in the inducedvoltage calculation formula?

Why is the induced voltage due to the current of the phase conductor wrapped around the shield not included in the voltage calculation formula induced by the shield/sheath in the three-phase coaxial cable? As shown in the equation below, the voltage…
Anthony Williams
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Does filtering and protecting the ground with an inductor, capacitor, and TVS have a benefit?

Let's assume a situation where you have a symmetrical power supply with the following output (in bracket is the net name, see the picture): +15V (+15V_DCIN) -15V (-15V_DCIN) GND (GND_DCIN) Earth (GND chassis, galvanically isolated) Connected to a…
NNN123
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2 USB cable stripped wires vs black unstripped wire?

Here is my simple little project , I have bought these 2 very long cables, USB cables, but with time the micro USB side which you connect to devices has been damaged on both of them, the USB connector that connects to the adapter then the wall is…
usa alb
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1 answer

Can I plug my Arduino into my USB port and have power applied to it via add on shield board?

I'm building a digital soldering station using Arduino nano. I need to add code to the sketch for troubleshooting. I's like to add "Serial.print" statements but don't know if it's possible to run both USB power and power supply connects at the same…
Lawrence Parker
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1 answer

9 wires in a CAT5e cable?

I just cut open a CAT5e cable since I wanted it for a project which required several twisted shielded pair cables. To my surprise there were 9 wires with isolation? I was under the impression that there were 4 twisted pairs, shield and possibly a…
LukasL
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Help rewiring mouse usb-cable shield

I am an IT student and that means I do not have lots of money and I use my mouse a lot. However, about a month ago my mouse starting randomly diconnecting and it got worse and worse to the point where it would not be recognised by my computer…
Aïto Hedgestock
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