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

learn more… | top users | synonyms

0
votes
0answers
25 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
votes
1answer
41 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 ...
1
vote
1answer
35 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 ...
1
vote
0answers
57 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 ...
-1
votes
0answers
41 views

Does DC Ground Need to Be Stepped Down?

I'm pretty new to electronics and I have just a quick question about ground DC connections. If I have a device that is being stepped down from 12V DC to 5V DC does the ground wire need to be stepped ...
1
vote
1answer
58 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 ...
2
votes
1answer
40 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. ...
0
votes
1answer
25 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) ...
4
votes
1answer
396 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.
1
vote
2answers
77 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 ...
1
vote
2answers
75 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 ...
1
vote
0answers
20 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 ...
14
votes
2answers
255 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 ...
0
votes
1answer
65 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 ...
0
votes
2answers
68 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 ...
1
vote
2answers
91 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 ...
0
votes
0answers
27 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 ...
0
votes
2answers
74 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 ...
3
votes
2answers
193 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 ...
0
votes
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 ...
0
votes
0answers
37 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 ...
0
votes
1answer
67 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 ...
0
votes
0answers
23 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 ...
0
votes
0answers
46 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 ...
0
votes
1answer
72 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 ...
0
votes
0answers
20 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 ...
0
votes
1answer
74 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 ...
1
vote
2answers
116 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 ...
0
votes
1answer
78 views

Different types of grounding [duplicate]

Can somebody briefly explain the different types of grounding with examples? Chassis ground Earth ground Signal ground
0
votes
1answer
41 views

Connect ground of system A to 1v6 of system B?

I have an embedded system powered by a 3.7V LiPo battery that will be connected to an iPod's headphone out cable. The embedded system will perform some DSP on the iPod's audio out signal and use ...
0
votes
2answers
98 views

unbalanced audio - shielding and ground loop for 2 ch

I have a 3 conductor wire that are all wrapped in a foil shield with wire conductor, for a total of 4 wires. I am connecting the 3 inside wires to audio left, right, and ground. This is an unbalanced ...
0
votes
2answers
75 views

unexpected power supply behavior

I am using this large 24V power brick (rated for 9.2A) to power a small circuit (an arduino controlling some RGB LED strip, drawing less than 0.5A). If I physically pull the plug out of the wall, the ...
0
votes
1answer
32 views

PWM Return Problem

A controller send pwm signal with 2 wires 1- PWM 2- PWM Return But servo motor has 1 input pin. So is it correct to use servo supply return (28v Gnd)or servo chassis input for controller pwm return ...
2
votes
1answer
94 views

An “operation” game sensor where the stylus is NOT attached to the power source

Edit: The person operating the catheter will be wearing latex gloves. The only human tissue the catheter would touch would be that of the patient. Also, to clear up some confusion about what exactly ...
-1
votes
1answer
80 views

grounding a 220 -> 110 V transformer

i'm in brazil my house has 220V power i have a transformer that converts 220 to 110V it has 2 prong power and 2 prong power out i would like to get the output grounded. I'm hooking up things with 3 ...
4
votes
6answers
3k views

How grounding works to prevent electrical shock

Can someone please explain the how grounding / earthing to prevent a person from getting electrical shock using simple illustration of a faulty electric iron connected to the 240VAC mains? I don't ...
3
votes
2answers
157 views

Should I use a current limiting resistor for pins labeled as NC which should not be left floating?

Playing around with the 23LC512-I/P SPI SRAM chip from Microchip, I found something strange in the datasheet (http://www.microchip.com/mymicrochip/filehandler.aspx?ddocname=en559704); on page 13, ...
0
votes
0answers
35 views

External power source steered by arduino through transitors - voltage differences?

I'm trying to steer rows of leds through arduino and I came into some difficulties. My circuit is inspired by instructable: So I have something similar to this grid of resistors and transistors on ...
0
votes
0answers
67 views

DIY HV Tube Isolation Transformer

I am making a bench top tube power supply from salvaged transformers. I want to make it as safe as possible so I am checking here before the build. The two 120V/20V transformers have electrostatic ...
0
votes
2answers
96 views

Where to connect frame ground

I have to offer a "FG" connection for the product I am designing. The product is isolated in many parts, so, which part of the circuit should i connect the "FG" to? Below is rough scatch of the ...
2
votes
1answer
111 views

Ground impedance monitor circuit design

I'm trying to design a ground impedance monitor. The idea is that the equipment in question needs to disallow operation if the ground wiring is disconnected or the connection is poor quality. This is ...
3
votes
2answers
112 views

Ground Pour in Power Supply PCB

I'm designing and building a linear power supply for my tube headphone amplifier. Considering this should be HiFi, I'm trying to make it as good as it gets within "normal" building costs and without ...
0
votes
2answers
248 views

When does and when doesn't current flow to ground?

I was thinking about when current can and can't flow to ground. I came up with that current will only flow to ground when we have at least two grounds in the circuit, since then we have a complete ...
4
votes
2answers
190 views

Should I ground an aluminum front panel?

I am building a power supply and it will be housed in a plastic case with a fan. I understand the wisdom of grounding a metal case, but in my case (no pun intended) I have an aluminum front panel. ...
0
votes
1answer
83 views

How do physical connection interfaces handle floating voltages

I am sorry if this is a bit of a novice question but I am new to electronics and have come to a problem that I can't quite see an obvious answer for. A while ago I had a bit of a scary encounter when ...
5
votes
3answers
544 views

Does a Connector With Multiple GND Pins Make a GND Loop?

There are some cable standards that have multiple GND pins on the connector proper. A good example of this is the SATA connector (it has 3 of them). In reality, each GND pin has a slightly ...
1
vote
2answers
97 views

Ground island or VCC island under IC

Suppose I have a small (4cmm x 4cmm) 4-layer PCB with standard stack-up of Signal-Vcc-Gnd-Signal. The board is dominated by two QFP-100 (FPGA and uC) on both on top and bottom side of the board with ...
0
votes
1answer
72 views

Where do I connect earth wire?

I'm trying to use this delay timer to control an exhaust fan. I have a 3 pin connection (with earthing wire) powering this fan and it works fine. If I have to insert this delay timer module in ...
4
votes
3answers
381 views

Shall I connect inverter with boat GND?

A friend of mine is building a boat. On this boat, he has 12V batteries with a 230V/13A transformer. Recently somebody suggested he should connect the null with the ground. With DC, this is common ...
0
votes
2answers
100 views

Earth connection missing on electric circuit, getting lots of noise with audio equipment

I have a question today that possibly crosses to another website, but i'm interested in your expertise here. It's more or less about music, but also about noise and electric current. Basically, I ...