Questions tagged [ground]

Ground or earth is the reference point in an electrical circuit from which other voltages are measured, or is a common return path for electric current, or a direct physical connection to the Earth.

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1answer
38 views

Ground Reference for multi layer board

I am currently designing a multi-layered PC board and there is situation where signals are referencing the ground plane meant to be used for the 3.3v supply. So, for example. I have a 3.3v plane on L8 ...
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3answers
91 views

Connecting analog GND and power GND

I need to connect a power ground and an analog ground. The power ground is a SMPS output. The analog side consists of 8 opamps and their resistors and capacitors. What's the best way to connect these ...
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2answers
67 views

Clean/reduce static in electret microphone caused by “dirty” Raspberry Pi pin output voltage

I'm currently trying to wire up an electret microphone to a Raspberry Pi. I just figured out how to wire it up to a button cell battery after a couple of days of struggling. Still learning electronics ...
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2answers
249 views

Old Variac — chassis ground? is it safe?

I've got an old (vintage!) GenRad Variac (below) that has two prong plug and two prong socket. I want to modify it to add a safety earth pin to both input and output. In doing so, I opened it up and ...
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3answers
346 views

Two layer FR4 PCB: should you place GND pour on signal layer?

Talking about two layer PCB's FR4 due to lower cost: I always poured ground on both layers of the PCB, I believed "the more the ground the better", but Recently I started watching altium ...
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Quick simple car lighting circuit question

I have wired up the below circuit in my car and would just like to ask if there are any issues with this circuit. The lighting in this circuit is tapped into three wires from the car's ceiling light. ...
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2answers
89 views

How does ground close the circuit, why isn't the current miniscule?

Let's say I have a 230v version of a AA battery resting on a table say, I touch the + terminal, think of me as a resistor of 1 ohm, the circuit needs to close, and can take infinitely many parallel ...
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2answers
105 views

current path into the ground?

Considering a monopolar HVDC system, with the ground as the return path. I was wondering if the current path is physically speaking like the red one or the green one in the picture? I think it is like ...
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3answers
76 views

LED Toggle switch for ground

I am in the process of doing some wiring on my car. Part of this is adding in a switch panel in. For this I have 4 LED Missile Toggle switch's. At the moment I use one for some additional lights, this ...
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1answer
96 views

What are the diode and two capacitors doing in this circuit?

I have an existing circuit from a working design that I am trying to understand in order to apply the understanding to a different circuit I'm building. We can reduce the scenario to basically two ...
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4answers
127 views

When current must flow in a circuit (loop), why does it flow to ground?

I learned that current must flow in a circuit (loop). When I swap the N-wire with the PE-wire on a light bulb in my house, the circuit breaker trips as soon as I turn on the light. This tells me that ...
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1answer
39 views

Synchro with 1 phase grounded

I have been doing some research into synchros and I know the base equations from to determine the voltage difference between phases. Those equations can be used to determine the angular position from ...
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2answers
56 views

When does separating digital and analog ground make sense, is it essential, and when is it not? Should I separate the grounds in this project?

I created a simple sequencer design based on several digital chips. The circuit is powered by a simple 7805 voltage regulator. When designing the board, I separated the analog ground of the power ...
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1answer
68 views

DC Power supply voltage swing when load turns on

Below is flow diagram of my pcb power side, the issue is when relay turn on a 12V 30 watt heater element the voltage drops (or swing) and stay down until load disables. This drop cause issue on my ...
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0answers
56 views

Oscilloscope 'ground' displaying at +2.4VDC

When ground-coupled, trace is a dead flat zero volts on the display. At 5V per division, DC or AC-coupled, with ground lead clipped to any point on circuit ground, the minimum voltage displayed is +...
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1answer
48 views

Pi Zero / GPIO Pins / +12V Power and Sharing Ground

I need a sanity check on my schematics before I pay for JLCPCB to make my PCB board. Goal: To have my Pi Zero fire a pyro charge in a model rocket. Setup: GPIO-20 Sends a signal to the MOSFET Gate, ...
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2answers
43 views

Can I use an isolated DC-DC module with breaking its isolation?

I'm in need of a DC-DC module on a project. The DC-DC module I have is here. This is an isolated module but in my situation its input and output is going to be on the same ground. Will it cause a ...
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1answer
64 views

Analog and digital ground plan with isolated DC-DC converter

I use two isolated DC-DC converter in parallel from 24V One TDN 3-2411WISM (single output) to create 5V for the "digital world" followed by LDO to create 3V3 and GND for the VDD (+Vout) and ...
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0answers
22 views

Need to build custom cable for Xilinx Programming

I need to build a cable that will connect 15 signals between two PCB boards. This will allow me to program a Xilinx FPGA over the select map interface (clock, data rw, cs). Since these signals are all ...
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2answers
45 views

Nixie tube clock circuit schematic

I recently found out about Nixie tubes, how to implement the decoder, microcontroller, as well as the power management. I have one big problem. I don't really know if ground = ground. On the schematic ...
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3answers
1k views

What is the danger of using ground as the return path in normal use?

I watched a video in which a man showing how to save money by only spanning a single cable as follows. The ac current passes through the single 30 meter long cable, a breaker, a lamp, and return via ...
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1answer
73 views

Is it OK to allow to more than 16mA (say 1A) to flow through Raspberry Pi GND pin?

I am fairly new to electronics and I'm designing a circuit which has two electromagnets (in my diagram I've used bulb symbols as I couldn't figure out how to represent the resistance of the component ...
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43 views

MAX608 boost converter stopped working, the OUT pin is shorted to ground

I was working on a little project to convert 3.7V from a lithium ion cell to 5V using a MAX608 boost convertor IC. I put the required components according to page 7 of the data sheet and everything ...
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5answers
400 views

Professor said no current flows to ground

According to the professor, adding the ground at 0V has no effect on the current flow and current flows in this circuit as if the grounding point did not exist so the answer is E. How have people died ...
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1answer
56 views

why does my USB 5V power supply not need a mains ground?

Every small 5VDC power supply (wall wart style) I see has the standard 2-prong Europlug, i.e. no ground. Even those with a British 3-prong plug just use a plastic prong for ground. Background - I am ...
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1answer
45 views

Does my signal generator's ground need buffering?

I have an AD9833 signal generator (sorry I mislabeled it in the diagram as an AD9388) whose output is fed into a unity gain buffer, see picture below. The output is then passed into various materials ...
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1answer
41 views

Solder station grounding setup

I have a Sugon T26 soldering station. It has an European 2 pin plug, I have a 3 pin adapter for it. As far as I am aware there will be no ground connection using this method. It comes with a ground ...
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1answer
62 views

Does my IR LED need a ground?

I have a circuit that connects an IR led to my Arduino. The positive leg goes to +5v and the negative goes (via a resistor) to a digital pin. However, I have since seen some pictures of IR circuits ...
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1answer
24 views

Using LCD and other modules with external regulated source and common ground

I am designing a circuit where I want to interface various modules with Arduino Mega. The way I want to do it is use an external regulated power source for the individual modules, instead of powering ...
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0answers
38 views

isolated Ground

I have a question regarding the ground connection of two isolated DC-DC converters. Is the connection advisable considering ground loops? Does it affect the safety? It is about the circuit seen below. ...
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0answers
65 views

How can I get rid of noise from leds on an audio line

I am working on a project which involves 8 sets of LEDs being controlled by a micro-controller. The micro-controller is also communicating with an IC which is sampling an audio signal. The audio ...
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1answer
89 views

How to properly split grounds

I'm currently redesigning a board that has a high failure rate. The design consist of three power rails 3.3v 12v and 24v 3.3v is coming from an USB powered Nucleo STM dev board 24v is my input power ...
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0answers
32 views

Ground layout between two data acquisition boards

I'm designing a two-board data acquisition system for resistive and capacitive environmental sensors. Board 1 hosts the sensors on a mezzanine daughter board (dashed lines) and contains the ADC for ...
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2answers
72 views

Is the Arduino ground or the common ground the same as Earth ground? Why or why not?

Is the Arduino ground or the common ground the same as Earth ground? Why or why not? Is the Arduino ground or the common ground the same as Earth ground? Why or why not?
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69 views

Why do we need 2 different grounds for connecting 2 thyristors back to back?

As seen above, these thyristors are connected back to back to resemble a TRIAC, but for high power applications. People say because they get shorted, but how exactly? Thank you.
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51 views

Low side MOSFET switch disconnecting charging

I have a problem with the design of low side MOSFET switch, that would be implemented in my electrical system to disconnect PV panels from a battery. This switch would be controlled by Controlling PCB....
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3answers
109 views

Is any signal ever one way

I am trying to confirm a suspicion/understanding about electrical signals, and especially One-way CONTROL signals i.e. specifically NON-Power type signals in electronics like, Trig/Echo pin in ...
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1answer
66 views

audio jack ground to main earth ground, safe or not?

My audio amplifier got some unclear noise from ground. amplifier ground is connected to player, and use some decent RCA cables, also tried to add ground loop isolatior to RCA cables. None of them ...
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4answers
571 views

How do you calculate negative and postive voltages in a grounded circuit?

This may be a vintage question, I'm not sure. I am self-studying electronics using some old books and came upon the problem below from "Basic Electronics" by RCA Institutes, 1965. The book ...
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4answers
1k views

Why attach sensor output to ground?

I'm getting into electronics (so my terminology may be a little wonky in places), and I'm trying to create a simple setup using a Raspberry Pi 4B, a GPIO extension board, a HC-SR04 sonar sensor, and ...
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0answers
68 views

Audio Signal ground to earth ground?

I have a NAIM amp (some audio amp) working very well. Recently, added a ARCAM phono preamp (some pre-amp for turntable) to it. Once the phono preamp is connected to NAIM amp, there will be clear buzz ...
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1answer
67 views

Is there a commonly used name for a “local ground” or “local common”?

Suppose we have a circuit that measures some external voltage like so: simulate this circuit – Schematic created using CircuitLab We will assume that the circuit is powered by batteries, and ...
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1answer
72 views

What happens if the ground of a PCB touches the earth?

I know that if an object is significantly more/less charged than another object and goes near it, an ESD can appear and then both objects would become balanced. This can happen when a human touches ...
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1answer
62 views

Where do I solder the shield wire on my USB C breakout?

First of all, I'm new to all this so I most probably won't understand complicated explanations. I'm planning to solder a USB-C breakout to my old keyboard's wires, but I'm not entirely sure where to ...
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2answers
106 views

Sharing ground between two fully bridge rectified AC signals

I am designing a device which has two AC input signals. The Input signals are as follows. A - AC Signal A B - AC Signal B Com - Shared Neutral for above inputs ...
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1answer
25 views

How to determine max amps over a common ground between AC-to-DC Adapters?

How can I determine the expected and max current running over a common ground wire between DC of AC/DC converters? Should I fuse the wire? I have two 5V/40A AC-to-DC adapters (AC is 3-pin each) for x-...
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1answer
62 views

Avoiding ground noise in analog circuit pcb design

Below single layer PCB is a constant current sink circuit (electronic load), it's pure analog supplied with ±12 V and consumes very low current (~50 mA) except the transistor control part (which ...
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1answer
352 views

What is the purpose of resistance R1 and R2 in this circuit?

I can't understand why the Resistance R1 and R2 are used in this circuit and why is the ground at position A fixed?
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6answers
2k views

When we can say 0 and 1 in digital electronic?

I'm confused when seeing wires contain GND and VCC in a schematic. Mainly their flows. I never confused when see in digital logic wires schematic like logic gates. I understand flows in digital ...
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1answer
47 views

How are ground wires and OPGW connected to ground and neutral point of transformer, and to the com.system?

Note: This question is about power systems in the kV, MVA range. Many distribution and transmission systems are impedance grounded, which means that (some of) the transformer neutrals are connected to ...

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