Questions tagged [ground-loop]

For questions about ground loops, which occur when multiple ground nodes in a circuit (which should be at the same potential) actually have a potential difference between them. This is usually caused by a significant current flowing between the ground node(s), thus producing a voltage between them. Ground loops cause various problems in a circuit.

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Why is single-point series grounding avoided in resolving ground-loop problems?

It appears that using single point series grounding, there is some additive effect $$ V_{c}-\mathrm{what's\;accounted\;from\;Circuit\;1\;and\;2} $$ My question is if this approach is closest to what ...
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common ground issue in signal transmission?

I am designing a device that output analog voltage in the range of -5 V to +5 V representing a certain measurement (single-ended earth grounded). My plan is to use a regular BNC cable, (earth ...
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Can I use 2 different power supplies to power the electret mic and op amp separately?

the power supply is a placeholder and it will be rated 12v to power the ne5532 op amp since 5v cannot power the op amp. The 5v dc will come from the same usb as the sound card which the electret mic ...
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Can a ground loop occur if everything is sharing a single socket?

In a system where all devices that are connected ultimately share the same wall-socket, is it possible for a ground loop to occur. For example: A strip cable plugged into a socket powers a computer ...
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Could the grounding of this circuit cause any issues or be improved?

These two boards are supplied from a 24 V power supply like in the picture shown. I didn't design any of them. The first board cannot be modified at all, the second board can be modified completely. ...
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Use TRS jack as Mono + 5V power input

I'm trying to change this guitar wireless transmitter so that the audio input jack also becomes a charging/power source. The charger will be a separate box with "stereo" input socket. ...
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4 answers
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How did using the shield as signal return end up as a common practice in audio?

Or in short: was cost the only motivation? Because the major reason against this practice must have been already plain obvious in the mid of last century. Namely, using the shield of a cable as signal ...
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How to implement a ground loop isolator in an audio circuit that connects to USB and line out of a laptop?

I'm working on an audio interface that utilises a microcontroller and a CS42448 audio codec. When receiving USB power and receiving audio from a laptop, there is a ground loop. Otherwise, it works ...
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7 answers
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How does the current of RS485 signals return from the receiver to the sender?

I am planning a system consisting of 1 master device which is connected to 19 slave devices using RS485 transceivers. Also, all devices are powered by 1 PSU. A simplified schematic is shown below. As ...
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Why is ground meaningless in high speed circuits whereas more important is the path of return current?

I know everything about this topic but I don't know why ground is meaningless in high speed circuits. So basically in high speed circuits these are the factors we need to consider-: Decoupling caps ...
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Ground loop between two devices powered by the same power supply

I'm working on a project with a Raspberry Pi and a Bluetooth receiver which are sharing the same ground and the same power supply. The wireless receiver gets the signal (audio content) and sends it ...
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Isolated DCDC converter bonding to ground

Is it okay to short input and output negative terminal of an isolated DC-DC converter? This kind of situation is not mentioned in the datasheets. The problem arises when a load has negative terminal ...
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Single Ended Signal Ground In a Loop

I have ten devices that I need to connect in a loop so they can send data from one device to the next until it returns to the original device. The devices are about 5 inches apart. They are all 5V ...
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8 votes
4 answers
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Why does analysis indicate that ground lifts do not fix ground loops?

Note: "Ground loop" in this question refers to a ground loop caused by linked magnetic fields. (Sometimes ground loop refers to slightly different scenarios.) Recently I've been looking into ...
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3 answers
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Can Bussed Grounds in Audio Patchbay Create a Ground Loop

I am working on a project to create a patchbay style interface for guitar pedals, wherein a set of guitar pedals can be routed in different configurations using TT cables (like the patchbay interfaces ...
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1 answer
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Grounding concept for an electrical machine test rig

I'm tasked wich building a test rig for electrical machines which consists of Machines mounted on top of a large ground plate which is connected to PE through a thick cable A torque transducer: The ...
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2 answers
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CAN Bus ground wiring

I am trying to create a concept for a system containing a 36 V battery, a 12 V battery, an Nvidia Jetson AGX Xavier, a CAN transceiver and two motor controllers. I am struggling to make the correct ...
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Voltage difference between grounds

I built the following circuit on a breadboard There are two power sources involved in the circuit, one for the Arduino (5V) and the other is the battery (3.5V) and all the components share a common ...
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4 votes
2 answers
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RS-485 Connecting 100 devices - Avoid GND Loop

I'm new to community and it's my first question, so please forgive me for mistakes I could do referring to adding pictures and descriptions. I plan to use 100 devices and connect them via RS-485 in ...
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Noise from switch mode power supply and ground loops

I've got a piece of equipment that has pretty severe noise on it that I'm trying to improve. It's an older system (built in '96 but a lot of the design is probably late 80's) and is mostly bundles of ...
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Isolated balun questions

Please see this diagram: On the left is a fairly typical unbalanced to balanced circuit featuring 2 opamps. The signal is then passed over a shielded twisted pair. On the right, I want to use a ...
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How to mitigate an unavoidable ground loop in a vehicle?

We have a display and a sensor that are installed in vehicles. The sensor is in a metal TO Can, and the manufacturer shorts the ground pin to the TO Can body for shielding. We mount that can in a ...
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Avoiding ground loop through d-sub like connector shield over metal enclosure

I have to pass a couple of analog signals between separately grounded systems over a HPDB68 cable. Ground loops have been a major issue previously, so the signals are passed differentially and ...
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Instrumentation Amp design for breaking ground loops between systems

We're in the midst of designing a device for measuring analog signals and have been testing our initial prototype. We had a single-ended gain stage before the ADC, but due to the connections in the ...
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1 answer
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Guitar Amp Humming (interference?)

So my amp worked perfectly fine in my old setup in another part of the house, but in my new setup it buzzes when I connect a cable, and with a guitar. I thought it was a grounding issue, but it didn't ...
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DIY radio burns components when using shared power source

first of all: noob disclaimer: sorry for the unprofessional sketch and my limited understanding of what I'm doing. I'll try my best to make myself understandable. I'm trying to make a radio receiver ...
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2 votes
3 answers
253 views

How to properly couple an audio (headphones) signal from a big/unknown system (worried about short circuits and ground loops)

I want to make a cockpit voice recorder for small GA planes. Typically the headphones of such aircraft are stereo, e.g. left is coming from the radio (ATC), and right is the in-cabin intercom. I want ...
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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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Probing an externally powered circuit using MSP432 connected to the PC

I have an circuit powered by an external SMPS and I'd like to debug it using a TI MSP432 MCU. The MCU is connected to the PC and I'll use TExaS Display software (it basically works as a cheap low-...
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1 vote
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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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Improving Stereo PCB Design

I just made my first attempt at making a Bluetooth Stereo PCB, and it was okay. This is a Class D Audio Amplifier, with the main IC being the TPA3122D2. O was planning on powering it through USB C, ...
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Determine ground Loop

I have designed a board that is acting weird when you touch the touch screen, turn on and off relays, and even if you touch any wire specify ground(on jacket of wire). I want to know how can I ...
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Is an inductor in a necessary ground loop useful for limiting noise in ground loops?

I am looking to ground several devices together that all ground to a common PC, and want to at least eliminate any HF noise between the grounds. It occurs to me an appropriately sized inductor series ...
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6 votes
3 answers
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What is the exact definition of a ground loop? Does a ground loop always have planet Earth in series?

I'm confused as to the exact definition of ground loops. It seems to me that there will ALWAYS be a ground loop if you have: 2 devices (both grounded). a data cable between them. You now have a loop ...
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5 votes
7 answers
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Frame grounding, data & power - EMI

I'm looking into building some large robotics with (ofcourse) a frame, (shielded) data/communication cables - EtherCAT, and power lines. Now different 'experts', websites and people say all different ...
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How can a ground loop cause a OSD to flicker / dissapear without affecting the rest of the video?

I don't know if it is best to ask this question here, or on drones.stackexchange.com, but I think that I am more likely to get a good answer here even if i might have to provide a bit more background. ...
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1 vote
2 answers
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Optocoupler to switch 24V using Arduino

I am currently redesigning a circuit to switch a spring applied brake using an Arduino Micro. The current circuit looks like this (please excuse if I'm using wrong symbols, I'm learning by myself): ...
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7 votes
2 answers
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Ground loops in a PCB with large hole in the middle

I'm designing a board for a client with some unusual constraints. My question is well illustrated with the following simplified example. Assume the positions of everything are fixed. Let's also ...
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1 vote
4 answers
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Why does this connection not become a low impedance between Positive (Isolated system) and Ground (Earth)?

I was going through a lecture regarding oscilloscope grounding methods and saw this image. Assume I have the isolated widget powered by an external battery. Now, I am going to measure the signals ...
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Grounds in a linear bipolar power supply for audio?

I've purchased a linear power supply, as surplus, from a local electronics dealer. It's a Condor AA15-0.8, made to supply ±15VDC at 0.8A or ±12V at 1A; as far as I can tell, it's a standard regulated ...
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Ground loop problem

I have two PCB : #1 and #2. #1 is receiving DC supply. #1 routes the DC supply to #2 with two wires (+5V and GND). There is an (non differential) analogic signal which must go from #2 to #1 with ...
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2 votes
2 answers
284 views

Trace Inductance when routing power nets for PCB

I have a situation where I have Analog and digital grounds. In the picture below the white traces are AGND and the Green DGND. The grounds split where the external supply contacts the board. I am ...
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1 vote
1 answer
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How to share a digital signal between circuits?

Please see this : The Task I'm trying to create a single module which can safely share a single digital signal. The idea is that each (identical) module can monitor the status of the signal, and can ...
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1 answer
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Connecting sensor and avoiding ground loop

I want to monitor the output from a motor encoder inside a machine, but I am worried about blowing up my Arduino. Can I connect the outputs from the encoder directly to the input pins of the Arduino ?...
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Noise caused by the separate power supply of the sensor?

For my experiment I built a circuit to record long-term vibration data. It consists of two types of sensors (proximity revolution and MEMS acceleration), Arduino, Raspberry Pi and power supplies, ...
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What are the types of devices that should use analog ground?

As the title says, what are the components that require a separation from the digital ground? For example, currently, I have a PCB where the microcontroller is powered and grounded to analog ground ...
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2 votes
1 answer
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Protection and termination of an outdoor underground Ethernet cable

I have quite a quite long outdoor FTP Cat 5e Ethernet cable (just shorter than 90 meters) that will be used to connect 2 buildings, buried 1 meter underground. As I understand, for a proper operation ...
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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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2 votes
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STM32F103 random reboots

we have made a 2 layer board for a STM32f103, and apparently it works fine but we get a random resets now and then. When that occurs there is a 1 in the Bit 27 PORRSTF: POR/PDR reset flag and Bit 26 ...
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2 votes
1 answer
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Low Side Current Sensing Grounding Question

I recently made a low side current sense circuit to test a power supply. It works well, but I am trying to understand the strange behavior that happens when I apply the negative lead of my probe to ...
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