Questions tagged [shield]

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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 ...
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1answer
67 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 ...
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1answer
36 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 ...
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0answers
58 views

How to power multiple Wemos D1 Mini

I’m planning on making my bay window blinds tilt automatically with Alexa. I've done plenty of research but can’t find my answers, hence the question. I have 4 individuals blinds which all need ...
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0answers
33 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 ...
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1answer
36 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 ...
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0answers
89 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 ...
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2answers
59 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....
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44 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 ...
4
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2answers
86 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 ...
4
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1answer
376 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 ...
1
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1answer
115 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 ...
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1answer
64 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 ...
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3answers
410 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 ...
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2answers
516 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 ...