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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2answers
56 views

Ground Earth Resistance explained in electrical system

I have several questions about the electrical systems used in the field and the grounding mechanisms. So, as far as I understand there are multiple systems that can be used to distribute electrical ...
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1answer
82 views

Use of choke to create analog ground: mistake?

Not infrequently I see designs that implement an analog ground like in the following schematic: This is a breakout module that includes an electret microphone module and amplifier that could feed ...
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52 views

SMPS Grounding and Earthing

I'm trying to design the isolated SMPS circuit. I'm a newbie on power electronics and I'm using a circuit design tool to design SMPS. I have confusion about grounding and earthing. My system will have ...
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4answers
109 views

electric guitar grounding for safety

As I understand it there are two reasons to ensure your electric guitar strings are connected to the common ground of the instrument. To dissipate the EMF/RF interference created by the human holding ...
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1answer
119 views

HDMI cable sparks and shocked me [closed]

I just owned a desktop PC and as display I connected my TV through HDMI cable. Today I changed the HDMI cable to one that can handle 4K resolutions. So I disconnected the old HDMI cable and then with ...
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1answer
72 views

Regulated Ground

this is more of a concept question than a physical circuit question. I am not an electronic engineer and only build electronics as a hobby in my free time so I do apologize if I am missing something ...
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39 views

Right way to couple DGND to Chassis ground

So we all know certain things: DGND (and subsequently AGND) needs to be coupled to Chassis ground, or Earth at one position, at least, in a device. The Earth is otherwise considered as a hazardous ...
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1answer
32 views

Protecting equipment submerged in water against earth fault - RCCB vs MCB

I would appreciate help understanding the difference between an RCCB and MCB in the context of the situation I'm sharing below. I have a mini fountain pump in my pond which doesn't have any earth pin (...
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3answers
64 views

Differential amplifier and different ground

I am designing a circuit to measure the voltage across the output of buck converter. With different ground for the buck converter and the micro controller, with respect to which ground will the ADC ...
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1answer
79 views

How are high voltage power lines earthed?

Most high voltage power lines run on a delta configuration with three phases and no neutral. Now if there isn’t any neutral (due to the nature of it being a delta system) then how can the power line ...
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0answers
40 views

Grounding paths of a capacitor discharge circuit

I would like to know how to properly ground the following circuit with 12V input and 390V output. Do I attach all the ground symbols to negative side of my 12V dc supply near input and all high ...
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3answers
87 views

Is this cable meant for metal case grounding?

I opened a heat pump cover and saw this little cable screwed onto the case but it appears to still be insulated from case and is supposed to be used by an electrician. Is this meant to ground the ...
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1answer
33 views

Car flasher circuit and grounding

My car flasher circuit can be simplified like so : The factory flasher unit is a standard 2 pin that plugs in series with the switch and the load (indicator lights). I'm attempting to make my own ...
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2answers
55 views

Earthing (Grounding) neutral terminals in transformer and converter

In a TN-S system and for a configuration below (single-phase isolation transformer, rectifier and single-phase DC/AC converter) what should be earthed (connected to PE wire)? I've been going through ...
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1answer
61 views

Measuring voltage drop across a 100 ohm resistor from an isolated power supply

I am new to this and i need help with a question I have in a circuit I want to measure the voltage drop across the resistor RS1. The opamp is powered by a 5V supply rail. The 50VDC is coming from the ...
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1answer
29 views

Simple ground connection when controlling with gpio different power supply

I have a STM32F4 Discovery board and I want to activate a LED connected to an external power supply. I could connect the LED to the 5V supply of the STM32F4 DISCOVERY but I'm testing this to use it ...
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41 views

Measuring technique for bridge rectifier driven by function generator

I am confused about a problem I am having measuring the output of a full wave diode bridge rectifier driven by a function generator. I am only getting half of the output as if it where a half wave ...
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2answers
46 views

Shared Transformer Grouding

I'm looking into creating positive square wave sharing same reference ground as primary on the secondary side of a transformer without using a rectifier. Assume that I have ability of providing the ...
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210 views

Why do we connect neutral and ground at the transformer? [closed]

Why do we connect neutral to ground at the transformer, why can't we just connect that neutral to the ground at our house?
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14 views

Multiple DP's- impact on grounding?

I'm working on the high level electrical system design for my future 'off-grid' PV-powered retirement home in the rural Philippines. My objective is a design which will provide maximum 'resiliency' i....
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20 views

Protecting External Connector Ground Pin from ESD

I have some TRS (stereo phone) connectors on my protable USB device (no earth ground), and I'm wondering what to do about ESD events that enter the device via the sleeve (ground) of the connector. ...
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3answers
120 views

What's the use of neutral wire in single phase home supply? [duplicate]

I am aware that the neurtal wire provides a return path for the current to the power source. But that neutral wire too, is connected to the ground at somewhere between the load and the source. My ...
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27 views

3 phase power systems

why does a phase ground fault in an impedance grounded 3 phase system lead to variation of voltage in healthy phases but this variation doesn’t happen in solidly grounded systems? I was thinking about ...
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2answers
47 views

Pre-amp connection problem

I am trying to complete the circuit shown above. I am having trouble as the ground connection is not clear to me. Please help me to complete that circuit. And also tell me how to connect C5 ground ...
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28 views

Can I use the ground wire of the grid with the power from my inverter?

In other terms : Can i connect ground wires 1 and 2 together ? EDIT : I'm in France, Grid is connected to a ground rod. System is 230v AC.
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1answer
71 views

Help explaining negative (ground) power connection through TV setup even though wire not connected?

After attempting to use a power inserted for the OTA antenna I discovered an unexpected problem. The inserter is powered by an UnGrounded Ac/DC adapter (Wal-wart as they are often called). All worked ...
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1answer
30 views

Inverting boost converter by using MC33063A/MC34063A: Where does the IC get ground connection?

I want to design an inverting boost circuit by using MC33063A. I want to generate -5.75V from a +5V supply. My question is, how does the IC connect itself to the ground? The 4th pin is the ground pin ...
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2answers
42 views

Audio ADC - grounding problem

I searched through the internet but couldn't find an answer to my question. Maybe I just don't know what to search for. I want to convert an audio signal coming from a stage box from analog to digital....
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57 views

Single wire earth return system

So, in a single wire transmission system, the earth acts as the return path for current to "flow back to source". Would this work for anywhere on earth, say, if we transmit current on a single wire ...
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2answers
102 views

Floating battery negative terminal [closed]

I am building a circuit that uses an op amp comparator stage to control the circuit shown. The op amp circuit will switch on or off the transistor to drive the motor supplied with a set of AAA ...
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0answers
38 views

Is there a potential earth leakage or is it something else?

I'm facing an issue in my house since last Christmas. When the lights or appliance with motor in any room are turned off/on the TV would go out and come back on in a short span (as if the power went ...
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28 views

Do I need to ground this circuit board inside my 3d printed case?

I bought a microphone amp system that has 2 mics and then outputs the audio via aux cable. I am using it for a project and 3d printed an enclosure for it and took out the circuit board from the ...
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1answer
69 views

Will this design cause corrosion from a ground loop?

simulate this circuit – Schematic created using CircuitLab The design is an undersea light. The connector provides the customer ground-line-neutral. The line and neutral are connected to an ...
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1answer
76 views

Connection between Chassis GND and Circuit GND for ESD/transients

In Henry Ott's Book, Electromagnetic Compatibility 2009, it has the following: Figure 14-14 seem to be in conflict with Figure 3-24 and 15-15. The circuit GND is connected through a TVS to chassis ...
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2answers
77 views

What is counterpoise?

I was reading about the radio telescope - Murchison Widefield Array (MWA) situated in western Australia. Antennas of this telescope are quite unique and different from usual dish radio telescope. In ...
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2answers
60 views

joining signal and power grounds together

I've read some questions and answers here about making 2 separate grounds - one for signal, second one for power. Every question was about the case where the grounds meet each other in one point. I ...
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23 views

TN-S system neutral point earth resistance

According to many sources on the internet, a secondary neutral earth resistor is added at the distribution stations (transformers) to reduce the earth fault current. My question is when using a TN-S ...
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2answers
27 views

Grounding Distribution Panel Earth Busbar using 'split' cable?

I'm pre-wiring a distribution panel for future installation into my retirement home in the Philippines. I've read that grounding the DP to an earth rod or equivalent should require a minimum 6AWG/...
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3answers
2k views

Why would this microphone only work while touching the volume control?

My son bought this USB microphone for his computer. It only works if you keep your hand on the volume knob. I assume this is a grounding problem. I took it apart. It looks like the copper wire ...
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1answer
64 views

What effect does the internal re-arrangement of charges have on the existing current? [duplicate]

In the figure, the circuit is physically isolated from Earth (The black line at the bottom). The red capacitors are parasitic capacitors. Under switching conditions the node voltages relative to the ...
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2answers
81 views

Schematic representation of AGND and DGND in a shared ground plane design

I've seen many questions asking how to connect AGND and DGND in a schematic, and the usual answer is to use some kind of net tie component with a physical footprint (and to approve the resulting ...
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2answers
145 views

Is this internal rearrangement of charges in a circuit a current and is this current different from the “normal” current of the circuit?

In the figure, the circuit is physically isolated from Earth (The black line at the bottom). The red capacitors are parasitic capacitors. Under switching conditions the node voltages relative to the ...
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0answers
49 views

Non Inverting op-amp grounding

I have this LM358 op amp as a non inverting amplifier used for high side current control. I feed this ic with 5v on pin 8 and ground is pin 4. Pin 2 and 3 are the inverting and non inverting inputs. ...
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2answers
62 views

YM3012 Analog Ground

I am trying to build a circuit using Yamaha Sound chip YM2151 with Yamaha DAC YM3012. This is my first attempt in doing anything with analog signals, so there is much to learn! While reading a ...
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1answer
4k views

PCB Crystal Layout

I'm designing PCB with 16MHz crystal for ATMega328p. Right now that is my layout. VIAs ring around edge of board is to stop EMI radiation from edges. There is no Ground plane under capacitors and ...
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2answers
73 views

RCA shocking myste [closed]

I got a zap from the shield of a RCA cable from my TV to DVD player(both TV and DVD do not have a ground terminal on the outlet plug). I measured the metal case to ground and I got a reading of 50V. ...
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29 views

Making an external Power supply from a internal power supply

I have a old Drum Maschine and want to remove the internal power supply to make it external. The transformer is grounded to the chassis of the drum Maschine ..... If I make an external How should I ...
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1answer
30 views

Earthing when Two Objects need to be Earthed

I recently bought a ‘Push To WAIT’ unit from the Highways Agency. It has a transformer that converts 240V to 48V which goes to the unit. The trouble is, the transformer and the Push to wait Unit both ...
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1answer
95 views

How can I accurately and precisely measure current in a 110V AC circuit, with a 1kohm-50kohm load, using an oscilloscope?

I need to measure the electrical resistance of a volume of ground. To do this I need to cause a current to flow between two metal electrodes pushed into the soil (let's call them the "current" ...
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1answer
22 views

How to Ground DC 12V Battery, Charge Controller and Solar Panel?

In my shed, i've got a 12V 120AH leisure battery and 30A MPPT solar charge controller, on the shed roof there are three 100w 12V solar panels. I wonder if I need to ground any of those? If yes what ...

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