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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52 views

Is voltage selector on 5v or 3.3v?

I bought this USB to TTL converter and it came with the option to switch between 5v and 3.3v. I want to use it at 3.3v, but I'm not sure where the (grounder?) should be placed? Thanks, see image below....
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Printed circuit edge trace

I want to know the purpose of copper edge trace in the following circuit:
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32 views

How do I remove electrical interference when using same source power?

I have a microphone receiver and a raspberry pi. I'm trying to power them using one DC jack. The receiver uses 12v and the PI uses 5v. The PI is outputting music which goes into an IN port on the ...
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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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67 views

12 AWG galvanized steel high tensile wire okay for running 12 volt 7 A DC?

I need to run 12 VDC about 50' along a fence that already has several 12 gauge galvanized steel wires running on it. It is going to be pulling less than 7 A at most. I can make sure the lines are not ...
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62 views

PCB Layout - Transistor to convert analog signal to digital pulses - how to connect emitter GND

If have designed the following circuit to convert a certain analog signal of an amplifier to digital pulses. The circuit works well - except for one point. My prototype PCB has 4 of these amplifiers ...
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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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47 views

24v AC common/ground

I'm trying to understand what I believe to be a basic/fundamental theory, however, I seem to be over analyzing. On many hvac units the 24v or 120v control transformer common is grounded to the unit ...
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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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Why does attaching the case to the PCB ground plane cause the audio to cut out on my cassette player?

I bought a NIB (new in box) cassette recorder on eBay recently but have had problems with the audio from the start. The issue was that touching the dials could cause the audio to crackle, go quiet, or ...
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35 views

Can I connect the frame ground on a PSU to the 'ground/earth' on a UK plug?

I have a PSU which has 'FG' (Frame ground), is this just the ground which I would attach to the ground pin of the UK plug? Image of the Live, Neutral & FG : Thanks
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PCB layout - Create common ground connection for 5V signal and 12V power

For my board, which drives dc motor, I want to create a common ground that connects 5v gnd and 12V gnd, as shown in figure 1. The problem I am encountering, as shown in figure 2 is that eagle cad ...
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41 views

Oscilloscope high impedance ground more noise?

If I setup the two situations in the diagram below one where a scope is connected to the output of an SMPS, and one where a resistor is placed between the grounds of the scope and the supply (which is ...
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36 views

Starved thermal on GND or starved thermal on power

These errors can make me a short circuit in my PCB which consists of 4 layers (top, power, GND, bottom.)
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28 views

Ground pour on pcb battery holder?

I'm designing a battery holder pcb for 4 18650 Lithium Batteries in series with max output 15A. The board has 2 layers. The bottom is just a GND pour. On the right there is the "battery pack out&...
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1answer
40 views

Electret microphone to USB soundcard

I am trying to interface a suite of aviation audio headsets to my PC. The headsets use an electret microphone requiring a voltage bias of 8V - 16V for power. Each headset plugs into its own instance ...
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44 views

Wiring for industrial applications

If I am buying wire to be used in a damp environment, and I need a ground wire for an AC device, can an insulated third core act as a ground wire? I don't know what effect having no insulation has on ...
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185 views

Install grounding cable with eyelet to outlet, no center screw

I've found an ESD mat that comes with a grounding cable with an eyelet that's supposed to be screwed into the center (grounded) screw of an electrical outlet. But in my home, the outlets do not have ...
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852 views

GND pin of a RF device

I have a doubt about how to connect the following device (a RF power meter, AD8318) to the external circuitry. Let's consider the device: There is the input RF coaxial cable, the power supply ...
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71 views

Different voltage differences for a UART signal (when tested from one microcontroller, vs when tested between two microcontrollers)

I have a question regarding UART signals. I am doing a project where I press a pushbutton (BTN0, BTN1, BTN2) it registers at a microcontroller (MSP430FR6989), transmits a signal to another ...
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70 views

How does equipment ground protects us from electrical shock?

What I have always learned is current leave the source and return back to the source, forming a closed circuit, here are the two thought experiments I had and got confused: Scenario 1: Here I have a ...
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48 views

Intercepting signals from vintage computer (common ground)

I am trying to reverse engineer the signalling for a peripheral to an old 4-bit computer and eventually I want to emulate the peripheral and send the appropriate signals back to the computer. I know ...
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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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19 views

41256 / 81256 - dram power and ground confusion

I'm trying to design a memory board for an Emu Emax sampler to enhance the amount of memory. Now, when I read the Emax service manual and look at schematics over memory chip connections (in this case ...
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41 views

Where does the Panel Mount BNC Connector make the ground connection to my PCB?

This may be a dumb question, but where does the PCB make a connection with the signal ground on this BNC connector? All I see is the signal pin that is soldered on (via solder cup) and no where is ...
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40 views

Connecting USB shield to system ground [duplicate]

I designed a PCB with an STM32 and a micro USB connector. I put a NUF2042XV6T1G between the connector and the STM32 to protect the data lines. The USB shield is connected to system ground via a 120R@...
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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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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
55 views

Should via use be used when it is not essential?

I am working on characterising a transistor at approximately Vds=1000V and Ids=100A pulsed at around tON=20ns. Should the power and ground paths (Top and Bottom layers) have vias connected to the ...
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76 views

Observe if terminals on a PCB became connected. Know nothing about the PCB, except it is powered with the same power supply transformer

I have a PCB with terminals I have access to, otherwise it's an unknown. I want to observe with my microcontroller (uC) if they become (dis)connected. The PCB is powered by a 24 VAC transformer, the ...
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81 views

Altium Simulation Reference Ground

I have a question about Flyback converter simulation on Altium. I set my reference ground GND. When I try this schematic with all grounds as GND like below Simulation is working good as you can see ...
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63 views

Ground vias use on no-trace areas at a 4-layer PCB

Background info: I am using a 4 layer PCB stack: Signal, Gnd, Signal+Power, Signal (mostly ground). To avoid out of question issues, I use this set-up due to a reference design on Texas Instruments as ...
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78 views

Ungrounded Simulated Inductor

Is there a way to make an ungrounded simulated inductor? The figure below shows a grounded simulated inductor. I was wondering if this circuit could be altered to simulate an ungrounded inductor.
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92 views

Buck Converter PCB Planes

I have a question about PCB copper planes with buck converters. For reference, I'm using the LM2673/LM2679. The parts are identical in layout, utilizing the DDPAK/TO-263-7 with the PCB tab being ...
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Why a capacitor is connected between two ground terminals and what difference does it make?

I was referring to a datasheet where I found a capacitor is connected between two ground terminals. Are these really ground terminals or am I reading the datasheet in the wrong way? Can someone help ...
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80 views

PWM Ground Modulation: is this circuit going to affect my other ICs?

I have designed a fan controller circuit based on the MIC 502 fan management IC: UPDATED SCHEMATIC QUESTION #1: The schematic (for the top part) is basically the one available here: https://bit-tech....
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161 views

Where to connect GND on keyboard multiplexer circuit?

Hi all, I'm making a project to read my old calculator's keyboard with an arduino and I've decided to design a new PCB and change it with the original one, as it's easier than trying to hook into the ...
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42 views

Recording IR data directly from Remote Control

I am trying to record the IR codes from my projector's remote. Nothing seems to be working and I need some help. I want to be able to directly record the IR signals that my remote is putting out when ...
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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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1answer
86 views

ATX PSU turns itself off when uploading sketch to Arduino

I'm trying to power a stepper motor with the 5V rail of an ATX PSU and control it using arduino. To keep the PSU running, I have shorted the PS_ON pin to ground. ...
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30 views

Sharing ground with high current circuit

I'm designing an electrolysis machine controlled by an ESP8266 that also monitors the current and voltage of the electrodes with an INA226. There are two separates power supplies, 3.3V,1A power supply ...
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1answer
32 views

How to make sure you have “adequate” ground in a self-enclosed portable circuit?

How to make sure you have "adequate" ground in a self-enclosed portable circuit? I read that a good ground ensures steady signals. But, if you run a circuit from a battery it is not connected to ...
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3answers
84 views

Daisy chaining ground to buttons

I am building a small controller box based on an Arduino or similar MCU board. There are upto 6 buttons on the controller. In regards to ground, can I daisy chain the ground round all switches? ...
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1answer
56 views

Plane Chassis Grounding

I'm having a hard time understanding Chassis Grounding. From my understanding, the frame of a plane is used for that and all of it can return to the batterie. Given my understanding, it remains a ...
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40 views

Can available -ve supply somehow used for an IC requires positive voltages?

This is a doubt related to a charge sensitive amplifier. Amplifier specification says: Power consumption approx. 80 mA at -20V at 60Ω. Does it mean that the amplifier operates in -20v / GND supply ?. ...
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64 views

Capacitor loading lets Atmega4809 die

I have an Atmega4809 (Arduino Nano Every) connected via UART (Rx,Tx,5V,GND) to a BLDC controller. Then I have connected a little display (Rx,Tx without GND.) When it is connected everything works ...
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62 views

4 Layer PCB Altium - 2nd Layer Ground, others Thermal

I read since a long time but never had an account, now its my turn to ask a question on here: I have an idea but currently unsure if that works technically or if it is good design: 1st (Top Layer) : ...
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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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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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63 views

How do I decide on a proper PCB ground layout?

I'm trying to figure out best practices regarding ground layout, but it seems the more I read the less I understand about the subject as many recommendations seem to contradict themselves. So far I ...

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