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

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34 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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0answers
64 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
77 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
102 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
168 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
74 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
76 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
69 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
63 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
440 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
42 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
90 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
26 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 ...
7
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2answers
357 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
148 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, ...
7
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1answer
136 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
82 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
55 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
57 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
59 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
93 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
89 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
29 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 ...
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1answer
64 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
74 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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0answers
65 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
77 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
62 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
60 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
415 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
126 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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0answers
24 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
284 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
91 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
72 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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2answers
188 views

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

Many turntables, such as the ever popular Technics SL-1200 mk2 have a separate ground wire which attaches to the chassis of the mixer or preamp you have your turntable connected to. It's also a ...
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0answers
35 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
88 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
303 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
38 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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0answers
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 ...
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1answer
73 views

Should ground be shared between MOSFET gate, draing and source?

I'd like make a voltage buffer with MOSFET STD12NF06L-1 IPAK - STMicroelectronics Configuration of Gate and ...
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0answers
28 views

Connecting signal and amplifier grounds

I am building an amplifier for my radio. They will both operate from the same battery pack, but will be around 10 meters apart from each other. The output from the radio will be connected to the input ...
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0answers
50 views

Do I need to insulate the inner box?

I am currently putting a transfotmer inside a metallic case. The transformer has to be grounded so does the metallic case. Looking inside the box, my frnd suggested that I might need to put a ...
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1answer
117 views

AC->DC Power supply ground and probing

I'm learning electronics and I have an old C64 power supply which was made at our local electrical shop back in the 80s. I'm taking a look at it to try and understand how it works. What I don't ...
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24 views

Mixing High Resistance Grounding and Solid Grounding Systems

I recently visited a plant that utilizes a HRG system but the backup generator uses a solid ground system. The plant is experiencing a high amount of equipment failures of VFDs, Communication cards ...
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1answer
83 views

Can 0V from an isolated source arc to earth ground?

I have a high voltage bus bar (~300-400VDC) that is powered by a variac. This sits in a case that has other electronics that are powered by a step down transformer (120VAC to 24VAC, then rectified to ...
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2answers
125 views

DO we have to ground transformer?

I am using the transformer (a ballast), and its specfication sheet could be found here ballast specification. But on the data sheet, it doesn't says where we need to ground it. Usually, we would ...