Problems related to the connection of circuits to ground or earth references. Can affect safety, accuracy, reliability and interfacing.

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31 views

How to shield an isolated battery powered system?

I'm currently in the process of "designing" (selecting) a DC-DC Converter solution for a battery powered widget that will operate in the desert. It has to comply with various aspects of ...
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1answer
37 views

Chassis Grounding a Bipolar Floating Power Supply

I'm building a simple function generator powered from a 24V AC wall adapter. I've rectified the incoming AC to 24V DC using a full wave bridge and an LM317. I intend to split the supply into +/-12V ...
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3answers
97 views

For a 4 layers PCB (with ground plane), covering with ground polygon on Layer 1&4 necessary?

For a single or double layered PCB board, usually I will cover all the empty spaces in the layout with Ground. This is the 1st time I am designing a 4 layer PCB layout. Layer 1: top signal (high ...
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48 views

Are input and output grounds shorted in regulators/battery eliminator circuits?

I am new to electronics and I'm curious about something: Would there be any voltage between the input GND of a regulator (or a BEC), and it's output GND? In other words, is GND the same everywhere in ...
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32 views

Which Ground Should I Use for my Function Generator Circuit

The broad question is, which ground should I use for my function generator and why. Some background, I'm trying to build a function generator based on the XR2206 IC. I've looked at a few circuits at ...
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1answer
78 views

Analog & Power Ground Planes Doubts

Working on a new board, I have to face some requirements to ensure the performance of the whole system once is manufactured. PCB is a 4-layer one, and it has both analog and digital components. But ...
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1answer
72 views

What happens if there is a fault in the neutral wire between the grounding pole and the centre tap of the transformer?

I was reading through some SE questions/answers on residential power transmission and came up with two scenarios I'm unsure about: Assume that your house is wired properly (with no degradation), but ...
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1answer
45 views

Connecting grounds when using an isolated DC/DC converter

I am designing a PCB that needs to convert 24V DC to 5V DC @ 8 amps. I would like to use an off-the-shelf converter and virtually everything in that range is an isolated DC-DC converter. Is there any ...
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72 views

Using a flagpole for a Wifi antenna

I would love to use an existing flagpole as a makeshift Wifi antenna, but am not allowed to attach anything to it. I.e. no J-pole, mounted antenna or coax running down it. Will this be at all remotely ...
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1answer
100 views

Mixed signal Microcontroller grounding

I have a circuit with split ground planes one for analog, and one for microcontroller/DC-DC etc. The microcontroller will be using its ADC to sample from the analog circuitry. Ideally I would like to ...
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1answer
119 views

Measuring an analogue voltage with isolated ground

I am working with a solar EV (car), and I need to measure the throttle pedal signal. The throttle peddle is essentially a 10k ohm pot between 5v and gnd on the motor controller. (0-5V signal). As ...
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2answers
190 views

How do I increase the signal to noise ratio in a true condenser microphone?

I made a simple condenser mic as a test project for something more functional. However, when I connect my microphone I only hear the mains hum. Using a factory-made condenser I hear the mains hum ...
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1answer
35 views

Problem with the grounding of the speaker and adapter [closed]

I have a problem with my speaker, Altec Lansing iM7, whatever device(iPhone, iPod, android phone) I plug into the ports of the speaker I get a electrical shock :/ I don't know what the problem could ...
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5answers
81 views

Welding Thermocouple to Test Sample

I have a 3mm copper test sample that is going to get heated up, and I would like to know how hot it is actually getting. Previously, we have just held the thermocouple close to the sample, but we are ...
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2answers
80 views

Books on Bypassing, decoupling and Grounding [closed]

I am really sorry to ask this question but I am new to PCB designing and Its pretty challenging for me. The layout works in LAB but does not work well outside. I observe glitches in system. I am a ...
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1answer
70 views

Safe use of high voltage in laboratory environment?

I'm completing a project in the lab that requires a spark. As such I've acquired an ignition coil and can use the Lab's standard 12V DC power supply that connects to the 240V AC Mains to power the ...
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2answers
69 views

Which GND pin do I use on a DAQ?

I'm trying to use an absolute shaft encoder with an NI MyDAQ. I'm powering the encoder using the 5VDC pin on the DAQ. Does the ground pin--AGND vs. DGND--I connect the shaft encoder to matter? I ...
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3answers
451 views

What are the different grounds on a PCB?

I am working with boost converters recently. I have problem which you can find here. After going through the datasheet several times I encountered the special focus on the ground plane. It talks about ...
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2answers
52 views

DIY Ring Light: Grounding Bulbs in Series

I'm looking at making a DIY ring light using multiple fluorescent light bulbs. I'm in New Zealand and we get 230-240V and an current of 10A. I know from this I could rig up to 24 100W bulbs in series ...
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1answer
112 views

How do I properly size components for an EMC filter for a variable frequency drive power supply?

One of the products my company designs is, essentially, common bus power supplies for variable frequency drives (VFDs). Thus far we have only sold into the United States. We are considering selling ...
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1answer
40 views

Headset input crosstalk, or how to mitigate the effects of common ground resistance

I am building a cable to connect a guitar (or a piezo) and headphones to the TRRS connector of a smartphone through 4-wires cable splitting at ~1 mt from the connector. I am experiencing a ...
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2answers
370 views

Which Earth should a chassis be connected to: supply, or local?

I have a doubt regarding the earthing of an appliance and its separate isolation transformer. Consider the following simplified schematics; this is my first guess at which earth each chassis should be ...
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1answer
160 views

Altium designer: GND plane Polygone does not reach a vias array

Here is what I always get : And here is what I want to have: I never had such an issue with my old PC, now that I changed the PC I start having bugs like this. What can I do to solve the issue, ...
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1answer
160 views

Should the unused areas on the top layer of my RF PCB have ground pours?

I realize there are some questions that are related to this topic but I didn't see any that are really RF specific. I am working on a 2-layer Bluetooth module and I have some unused spaces on the top ...
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1answer
83 views

Grounding a pcb

What are the most important rules for grounding in a pcb? Can anyone explain with reasons? We are making a pcb for electrical power systems in our project. It has high switching converters and some ...
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1answer
72 views

Why is mains voltage showing up on my oscilloscope from MagSafe shield?

I'm theoretically aware of grounding issues that can come up when using an oscilloscope [e.g. as explained in this video], but I can't make sense of this one: I have a device under test (imagine an ...
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2answers
64 views

Possible grounding issue - HDMI over CAT-6 electrical arc

I was recently asked to help with some A/V stuff at my church. The goal was simple: Display HDMI video from a laptop to two LCD TVs. Since distance was an issue, I purchased an active HDMI-to-Ethernet ...
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1answer
62 views

Is that possible to create a virtual ground,for electrical purposes? [closed]

It might sound crazy, but I have seen many houses that doesn't supplied with electrical Ground (earth), and today there are many devices exist that need electrical ground. I know that some people ...
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2answers
97 views

Why is my body the path of least resistance during a shock? [duplicate]

I must say that electricity is hard to grasp conceptually. Just when it makes sense, you think hard about it and it all becomes confusing. When someone says electricity takes the path of least ...
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1answer
95 views

Car Ground Point Requirements

I work on a car structure precisely on a body in white which include parts in aluminium and some others in carbon fiber... I wonder if there are any requirements for the location, number of ground ...
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0answers
30 views

Touch-sensitive jack chassis socket

I am building the faceplate of an analog audio synthesizer, using a set of 3.5 mm jack chassis sockets like the WQP-PJ301M-12 for CV inputs and outputs. These sockets are mounted on the faceplate ...
2
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1answer
66 views

Should I using ground pours to surround high speed lines?

Previously I've been using ground plane pours in Eagle to connect ground points and also to surround lines that I feel need protecting from surrounding noise. This is on two layer boards. By drawing a ...
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1answer
93 views

Portable device shielding & ESD

I'm working on a portable battery-powered device with a shielded I/O connector for sensors, but I'm confused about how to properly ground the shield and ESD array. Here is a block diagram of my ...
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66 views

Safety/Quality issues by modding PC PSU to be floating.

Since I don't have enough money at the moment to purchase a good bench power supply, I want to 'mod' a PSU. In the first instance not by opening the PSU, but just by making an adapter that also puts a ...
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1answer
85 views

Placing Ground Vias To Improve EMI

Placing ground vias all over the PCB (stiching) to improve the EMI. Have all ground vias to be spaced the same distance? Or may they be separated different distances if it is under lambda/8? I ...
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1answer
72 views

Grounding two boards connected to a backplane

I have a design which consists of a backplane and two boards mounted to this through some headers. The backplane provides a common 5V and ground to both boards and it also has a solid ground plane. ...
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1answer
78 views

How to properly ground chassis containing AC/DC switching power supply?

I'm planning to build a Digital Audio Converter as a hobby device and I had some questions regarding safely grounding the chassis. I want to purchase a power supply like this one: MicroMall(TM) ...
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1answer
417 views

Can the ocean be used as ground?

When grounding a tall tower in a rocky island, can we just throw a couple naked cables in the sea? If not, why not? Please provide real-world examples if known.
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2answers
169 views

How can I protect equipment plugged into ungrounded outlets?

I have an older house that does not have grounded outlets. Previously, I have used 2-prong to 3-prong adapters to plug in my equipment (which remove the grounding ability). I understand that this can ...
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2answers
81 views

Grounding a wire using a chunk of metal?

So I've made a complex LED grid and it works but has ghosting in some of the rows. I've given up trying to work out the reason why, but have noticed that when I touch the SCLK wire, or connect the ...
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26 views

Testing conductivity strength of magnesium anodes in different weights

I work for a tracer wire manufacturer for the underground non-metallic pipe utility sector, natural gas, water, sewer and telecom. We use magnesium anodes for grounding out the far end of the tracer ...
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2answers
298 views

Static shocks all over the building

I just came from the local library, it’s quite big, and most of it is made of an architectural design using mostly painted metal book shelves painted with some kind of anticorrosive paint along with ...
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1answer
99 views

Loops in ground planes

Working on a PCB layout and just did some ground plane pour. From working with tube amplifier designs I know that a good star shaped ground design helps a lot to keep hum out of the circuit. Ground ...
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2answers
73 views

reducing mechanical vibration from a PSU

I have a keyboard synthesizer which emits a 60Hz hum due to mechanical vibration of its PSU. The vibration is magnified by the metal chassis of the synth which acts as a soundboard. It’s very annoying ...
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3answers
422 views

What is the purpose of a turntable's ground wire?

EDIT: I understand that the ground wire reduces hum. I'm not looking for a qualitative answer. I'm hoping someone can break it down for me Henry Ott or Bill Whitlock style. Many turntables, such as ...
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0answers
37 views

CRT grounding question

I am going to convert a CRT monitor into a high voltage power supply. I have been watching some people do it. The problem is, you must unplug the CRT before working on it. So how will connecting the ...
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2answers
91 views

How to add ground to DC circuit?

I'm just a dabbler in electronic circuits and I'm really still kind of a noob. I am working on a project called the "Atari Punk Console" (Originally known as the "Stepped Tone Generator") but there ...
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2answers
361 views

Why do some electrical devices have a ground and others don't?

I noticed in my kitchen that the toast oven and the range hood had a ground fault, first by using a voltage detector pen, when getting near it the pen would activate from a distance (around 5cm ...
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1answer
39 views

Grounds on an Evaluation Board

For testing purposes, is it ok to assume that every ground pin on the EV board is the same? even if not connected to each other explicitly? i.e. when using measurement probes is it ok to stick the ...
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47 views

Sense continuity in cable and lock with MCU

I'm building a "smart" cable lock system where the user will put a steel fitting attached to the end of a steel cable into a lock aperture, after which the presence of the steel fitting needs to be ...