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Questions tagged [shield]

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4 answers
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Use of TX/RX on Wemos Relay Shield

I am using this relay shield in a project and I am curious of the use of the TX/RX pins for this component. There are quite a few pins on this shield when D1 is all that's needed to trigger the latch....
aaries's user avatar
  • 1
2 votes
1 answer
255 views

1Gbps Ethernet : use shield for slow signal?

Short version : Is it OK to use the shield of an Ethernet cable to carry a very slow analog signal (100Hz bandwidth is great, 1Hz is OK)? Nb : I don't care if I get some >1MHz noise on my analog ...
Sandro's user avatar
  • 7,697
-1 votes
1 answer
140 views

What wiring diagram symbol is shown in this image?

What wiring diagram symbol is shown in this image? This is from my automotive electrical class.
Geneva's user avatar
  • 7
0 votes
1 answer
150 views

Is there multipath inside a shield box?

Since metal surfaces reflect EM waves, if I put a transmitting antenna inside a shield box will the transmitted RF signal scatter everywhere inside the box?
Thanos's user avatar
  • 137
11 votes
4 answers
3k views

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 ...
Marek's user avatar
  • 163
0 votes
2 answers
533 views

ESP and a metal cover (but not on every devboad) cover under which it hides

This is regarding the metal cover on the ESP devboards, which covers, among others, the ESP itself, flash memory, etc.: This topic has been discussed here before, and the reason for this cover is ...
Karlsson's user avatar
  • 113
1 vote
0 answers
69 views

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 ...
Anthony Williams's user avatar
3 votes
1 answer
89 views

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 ...
Derek Tables's user avatar
1 vote
0 answers
76 views

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 ...
NNN123's user avatar
  • 103
2 votes
0 answers
122 views

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, ...
Charly's user avatar
  • 752
0 votes
1 answer
137 views

Isolation for a long distance industrial CAN + audio box

I am working on an industrial control board + node network system. This system needs to be very robust, both for signal integrity as well as protection from transients. The basic setup is shown here: ...
Kyle Hunter's user avatar
1 vote
0 answers
232 views

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 ...
usa alb's user avatar
  • 11
1 vote
1 answer
44 views

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 ...
Lawrence Parker's user avatar
2 votes
1 answer
689 views

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 ...
XgN's user avatar
  • 31
1 vote
1 answer
709 views

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 ...
LukasL's user avatar
  • 128
0 votes
1 answer
74 views

Driving 2 Stepper Motors using a Quad Motor Driver Shield

I've tried driving two Size 8 Bipolar Nema Stepper Motors using a Quad Motor Driver Shield from DFROBOT. I get vibration and noise through the motor but can't get it to move. Is it possible to use ...
StepperMotor123's user avatar
3 votes
2 answers
2k views

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 ...
Zammy's user avatar
  • 31
2 votes
1 answer
5k views

Shielding with Aluminium Foil

I want to shield a capacitive touch sensor circuit from external EMI/RF noise. It's for a commercial product meant to be used in every kind of reasonable environments. I don't have a specific ...
Fredled's user avatar
  • 2,360
4 votes
1 answer
1k views

Connecting USB shield to system ground [duplicate]

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@...
Crazor's user avatar
  • 435
1 vote
0 answers
481 views

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 ...
Aïto Hedgestock's user avatar
0 votes
1 answer
321 views

Powering an L298N's IC and an Arduino Uno R3 using an LM7805

Before i start i would just like to say that i am an absolute beginner at this, and this question might be a little silly. I'm trying to make a shield that'll go on top of an arduino uno. The shield ...
Myadra22's user avatar
0 votes
1 answer
164 views

RF shield needed for BLE SoC in PCB design

I´m checking the implications of using BLE in a new design. This design will include in the same PCB a BLE SoC, the specific matching network and an anetnna (still checking if I´m going to use a ...
LazyTurtle's user avatar
0 votes
0 answers
47 views

Shielded Cables in Redundant Links

In the following diagram from a Redundant Emergency Stop (p.356 ref), there are two pairs of shielded cable. At the (1) end, the two individual shields are grounded. At the (3) end, after the Z ...
Brethlosze's user avatar
  • 1,427
0 votes
1 answer
59 views

Flexible GPIO routing Arduino shield

I want to make a combined MIDI In/Out/Thru + MDX Output shield, so I can order/design just one shield for all my needs. It is intended to use the shield for Arduino Mega which has 4 UARTs, and I want ...
Michel Keijzers's user avatar
0 votes
0 answers
99 views

What kind of material is this and what is the purpose of this?

In 500 GB or higher capacity HDD's, you can frequently find these black things (see photo below). It is made from a very weird feeling material. It is not made of plastic, it has a dull glass sound ...
Codebeat's user avatar
  • 1,367
1 vote
2 answers
501 views

How I can simply measure interwinding capacitance in a transformer with electrostatic shield

I want to measure which is the effect of the connection of the electrostatic shield (between primary and secondary) to ground (or to neutral) in reducing the interwinding capacitance in my transformer....
Gianluca G's user avatar
0 votes
0 answers
200 views

Wire shield when using connector for strain gauge sensor

I have made strain gauge sensor with 1 strain gauge. Thet gauge is in "bottom" part of Wheatstone brigde (one strain gauge terminal is signal, second is connected to ground). I'm using Sommer CICADA ...
xkam555's user avatar
  • 133
4 votes
2 answers
619 views

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 ...
EasyOhm's user avatar
  • 4,669
4 votes
1 answer
1k views

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 ...
abhiarora's user avatar
  • 962
1 vote
1 answer
330 views

Lightning protection for Antenna Connector

I want to add lightning and ESD protection for the antenna used with my PCB (Wireless Gateway). The antennas that will be used with my PCB are Pole Mount Antenna. There are three different types of ...
abhiarora's user avatar
  • 962
1 vote
1 answer
114 views

Double Shielding -- Insulator between shields?

To minimize RFI and provide maximum shielding on an enclosure, a double shield will be used. I need 120dB of isolation over a certain range of frequencies and will be testing using a reverberation ...
skyler's user avatar
  • 10.2k
1 vote
3 answers
1k views

RS485: Where to connect the cable shield in a battery-powered system?

I have implemented a Modbus with the RS-485 bus. The length of the bus is about 80 meters and I have connected the master and 10 slaves. The system is battery-powered and will be outdoor. My question ...
FranMartin's user avatar
2 votes
2 answers
939 views

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 ...
MrBit's user avatar
  • 2,053