Questions tagged [grounding]

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

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23 views

Pulsed DC current measurement using arduino and shunt resistor

I am currently working on a project ( to develop a constant current pulsed DC supply) in which current has to be measured using Arduino's analog input (Upto 20A) passing through a variable resistance ...
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0answers
40 views

between earth and ground

In my 100 Watt ACI Drive circuit, I've confusion about which components will be best to connect between DC_Bus Ground & Earth? FYI: 300 VDC for Motor & 15 VDC for Logics & other ...
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2answers
27 views

Connect MIDI input shield connection to ground with capacitor. What voltage / kind?

The midi specification mentions optional capacitors between connector shield and ground for a midi input: Neither the type of capacitor nor the voltage rating is specified. I would think that the ...
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1answer
47 views

What grounding should I use for this capacitively coupled input?

I'm designing a device that will receive and digitize analog video signals. In analog video, it's recommended to capacitively couple inputs. A typical input might look like this: In this case the ...
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1answer
53 views

PCB Ground Plane and Redundant Connections to Common Ground

This is a question borne of sheer ignorance, but I'm not sure if it's a good or bad thing. I'm designing a PCB (1) that will connect to another PCB (2). The latter has all of the power, ground, IO ...
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1answer
26 views

Common ground b/w power supplies and analog pin for microcontroller

Referring to the schematic below, is it best practice to have the 5 V supply on the right powering the MC (arduino-esque microcontroller) share a common ground with the 24 V supply ? The 24 V supply ...
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1answer
72 views

Can somebody please explain to me the principle of a T-T Earthing system?

How are the transformer, consumer's side and the generator earthed in a T-T Earthing system? I seem to understand that the generator and its frame should be earthed separately; The neutral of the ...
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1answer
58 views

Floating neutral in TN-S or TN-C-S earthing system

Since neutral is bonded to ground at building distribution point in a TN-S or TN-C-S earthing system, could floating neutral happen under the following conditions: Loss of N and/or PE at transformer ...
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2answers
133 views

Separate grounding for analog and digital portions of circuitry

A datasheet suggests separate grounding for analog and digital portions of circuitry (http://www.ti.com/lit/ds/symlink/am26c32.pdf#page=12). Is this to say that the IC's outputs should have a ...
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1answer
29 views

Grounding GPIO pins during 8051 programming

I'm trying to make a programmer for the 8051 microcontroller IC's, specifically the AT89C2051. I saw a circuit online (the blowit programmer) in which the unused GPIO pins are left floating. When the ...
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1answer
76 views

Difference in current transformers conection for ground fault detection

I have seen that for detecting ground faults on a 3-phase system powered by a secondary wye connected transformer, current transformers (CTs) can be connected in several ways: On the ground ...
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2answers
116 views

Grounding of IT equipment for office ESD protection

We've been having a lot of problems in my office with ESD. People touch cubicle frames and monitors shut off momentarily, painful shocks through laptops, etc. I'm worried about equipment getting ...
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1answer
131 views

Crossing ground planes with low current low frequency signals

I have a board which has two ground planes, analog and digital, that on this board are completely separate. The grounds connect on another board, which is connected via a flat cable. All signals on ...
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5answers
578 views

How can I get ground from a NEMA 5-15R wall socket without electricity?

I have some network equipment that I want to connect to ground (they come with 2-prong wall wart PSUs and have a separate screw hole for a grounding pigtail) - but where would I get ground from in a ...
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1answer
42 views

Should I tie my various DC power supply 0 V rails to ground?

I'm putting together the controls for a CNC router table I'm building. In the enclosure I've got some DIN rail power supplies, contactors, and terminal blocks. Also in the enclosure is the VFD for ...
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1answer
221 views

Making 2 layer board, using ground pour when I already use ground plane?

I'm working on a project were we are making PCB for measuring weight with 24-bit ADC (AD7792), MCU and GSM module. Because those measurements are highly sensitive, we are considering AGND and DGND ...
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0answers
31 views

Electric Shock in Walls and Electrical Equipment [migrated]

I'm getting a shock when I touch walls, electrical equipment like a water cooler, fridge, etc in my home. I have followed this procedure as I only have a DMM with me. The readings I got after ...
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8answers
5k views

What is the right way to float a home lab?

I just got myself some new toys for my lab at home like 30V DC power supply, KKmoon signal generator and a Rigol DS1052E. I want to float everything, because I don't want to spend any money on stuff ...
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18 views

Grounded outlet with load for ungrounded outlet [migrated]

Moved into a place, nearly every outlet is ungrounded with the exception of a couple GFCI in the kitchen and bath. Needed three prong for the fridge (and really didn't want the new appliance ...
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1answer
117 views

Power supply and pcb connections to ground, earth

I am planning a pcb which is powered by two switching power supplies LRS-150F-5 (230 V/AC to 5 V/DC) LRS-150F-12 (230 V/AC to 12 V/DC) . The power supplies are mounted in their own metal box and the ...
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3answers
86 views

Large Power System - Separate Earth Grounds?

I'm a EE working on a scientific instrument that is large in scale, like a building. The structure is all metal and will have many server cabinets and electronics equipment, motors, sensors spread all ...
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1answer
96 views

How should I connect the audio ground and shield wires in a Cat5 cable for analog audio?

I would like to carry 3x balanced line level (not mic level) signals to another part of my living room and I found that the cable space in the skirting boards would not allow 3x balanced cables (XLR ...
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2answers
43 views

Grounding balanced secondary isolation transformer for EMI suppression

simulate this circuit – Schematic created using CircuitLab Which is the best secondary connection to clean the main line power from EMI, line noise and HF harmonics by using an isolation 1:1 ...
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2answers
521 views

Choose proper grounding when using multiple LDO, buck, buck-boost and invering regulators

I'm a little stumped by how to avoid ground loops. I need to connect to a mostly analog external component that requires VCC_12V, VCC_5V, VCC_3V3, VCC_N7V (\$-7.0V\$) and GND. I assume the external ...
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1answer
76 views

ESD Grounding Straps with No Chassis Ground

I've got water pump device that needs to pass ESD testing (IEC 61000-4-2, 8kV contact, 15kV air discharge). On this device (as circled in red), there are these four metal inlets. At 2kV with an ...
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2answers
813 views

Confusion in grounding shield wires of transducers

There is a 6-wire Wheatstone bridge type load-cell and one of the wire is called shield and it is electrically connected to the metallic case of the load cell as below(I marked that with yellow ...
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2answers
258 views

Grounding options between three PCB's

I have a PCB (let's call it PCB #1) that has a Li-ion battery as its power source, sourcing 12V to 17V. The power from the battery is used to step down to 6V using a buck converter on PCB #1. A cable ...
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2answers
152 views

PCB grounding through screw head

Can we use zinc plated screws for PCB grounding? Means the zinc coated screw head will be in contact with copper trace on PCB for grounding. But this can cause galvanic corrosion between zinc and ...
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3answers
750 views

PCB Design/Grounding: Minimize noise

I have a question about proper grounding while measuring low voltage signals meaning how can the noise be minimized? The following schematic shows the setup: simulate this circuit – Schematic ...
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3answers
443 views

Is star grounding sources necessary for this data acquisition system?

Several single ended output and PSU powered transducers are tens of meters apart from each other outputting 0 to 10V DC like voltages. Some are temperature transducers some are force transducers ect....
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9answers
5k views

Grounding in space

I'm working on a project that will be launched inside a Blue Origin New Shepard rocket and need to know the details of how our experiment will be grounded. The experiment will have a 5 V USB 3.0 ...
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3answers
380 views

Electrically Grounding a Large Heatsink to PCB Layer Ground

I have a 100x100mm board that is directly attached to a same sized heatsink on one side (touching heat producing IC packages). The board is 4 layer, with a large ground middle layer. Is there any ...
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2answers
271 views

Chassis grounding for multiple daisy-chained units

I'm designing a system that provides power/ethernet/serial for up to 5 daisychained units. All of the boxes will be metal and my initial plan is to run power and signal ground through the 14 pin ...
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0answers
38 views

Unexplained differences in behaviour between U.FL-terminated antenna and SMA-terminated antenna

I would like your opinions/advice regarding an unexplained observation between a U.FL-terminated antenna and an SMA-terminated antenna. Both antennas are from the same manufacturer and normally tuned ...
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1answer
36 views

Grounding and shielding between isolated devices

I have a battery operated micro controller with a hall sensor, mounted on a motorbike. The hall sensor has a shielded cable to counteract spark plug induced EMI. By default, the entire setup is ...
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2answers
119 views

How does grounding prevent electric shock?

I understand that an electrical appliance will be connected to ground to provide a path back if there is a fault and a live wire touches the case. However if a person is also touching the case at ...
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3answers
71 views

Line to ground faults

I am having a trouble understanding the concept of line to ground faults,and ground in general. In this simple single phase circuit, does current reach the load and the circuit operates normally? ...
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1answer
81 views

why is it bad if a coax cable (used for antenna cable) has multiple paths to ground?

I have an Internet modem/router device connected to a 20 foot LMR400 coaxial cable which uses N-to-N type connectors to connect to a 10 foot LMR400 cable, which is then connected into an ...
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1answer
245 views

SiPM Array, High Speed Layout

I'm working on an prototype array of Silicon Photomultipliers using the Sensl MicroFJ-60035 TSV device. It's a small 6 mm by 6 mm square-shaped BGA photomultiplier. Think of a 6x6 BGA array with the ...
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0answers
42 views

Why is there a positive body voltage when grounded, but none when not?

So after reading about earthing and earthing mats, I decided to make myself a very basic one for cheap to test the concept before jumping in with purchasing more sophisticated products. Here's what I ...
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2answers
129 views

What are the errors with using only the line from a socket to power an appliance?

In the diagram below, the image on the left shows how a plug is normally connected to an outlet. The image on the right shows how the socket is replaced by a new configuration. One of the holes on ...
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2answers
136 views

Connect IR Emitter (+) to IR Receiver (+)?

I have a vehicle stereo deck that has an IR receiver input (+) and a steering wheel control module that has an IR emitter LED (+/-). The steering wheel control module, "translates" (using a mapping ...
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2answers
57 views

Earth line safety [closed]

I am working with a conductive appliance that a user will be in constant contact with over extended periods of time and the appliance is constantly earthed. These two facts cannot change, other than ...
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1answer
24 views

Do the dipole antenna edges have earth potential or is it a closed circuit made of co-axial cable?

I understand the shape of the dipole antenna, but how is it fed so that the current only flows through one direction during the half cycle? Even in a normal pole antenna, is there a ground at the edge ...
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1answer
36 views

Is it right to define ground as a pool of surplus free electrons, like a metal?

In a dipole antenna or any other pole like antenna, there is supposedly a ground on one side causing the current to flow away and towards the ground towards the feed, but if the whole antenna itself ...
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1answer
126 views

Grounding PCB Within Aluminum Enclosure

I have been doing some research on this question and, while I found a number of questions here asking something similar, I don't quite get the side-by-side comparison I am looking for. Therefore I ...
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1answer
49 views

LCD suddenly stops displaying

I am using a PC2002LRU-BWB-H-Q LCD with a STM32F4 micro and is powered through a TMP10424. There is also some 3V3 and 5V modules to. The problem is that the LCD is displayed fine for over days and ...
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1answer
117 views

Can a house battery share common ground with the starter battery without interference?

I am quite new at this so bear with my questions. I have purchased two 12 volt batteries which I will connect in series for 24 volt and to be used as house batteries. I drive a truck which has a 24 ...
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0answers
62 views

Does regularly spaced via stitching contribute to standing waves on an RF PCB?

Should vias be irregularly spaced? Can consistent spacing between ground vias create standing waves. Has anyone ever heard of this? I've been doing this for awhile and I've never heard this and ...
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2answers
8k views

Am I supposed to ground the inverter or the battery? Or both? To vehicle chassis

I am setting up a solar system in a vehicle. I have 400W solar panels, a 12V battery bank, and a 2000W inverter. I've looked at the manuals and read online to figure out the wiring diagram below. ...