The groundloops tag has no wiki summary.
3
votes
1answer
109 views
Inter-PCB Ground Loops
I have designed a mezzanine PCB that will sit on top of a main PCB connected via two connectors on either end of the mezzanine PCB.
If I connect the grounds on at both connectors (And thus at both ...
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0answers
149 views
Separate grounds on connector. Common ground plane on PCB?
Further to this question: Best way to group power pins on a connector? where I was advised to keep the ground pins for different power supplies separated on the stacking connector.
And bearing in ...
4
votes
3answers
389 views
Ground loop problem with Power over Ethernet
I am trying to build a weather station, powered using Power over Ethernet.
Originally I planned to use a Nanode as the microcontroller, but since the Raspberry Pi is so cheap, I decided it was much ...
0
votes
1answer
103 views
SMPS power supply shows strange AC voltage output
Hi I have been using a simple laptop power adapter (15V) for my electronic
lab-works. And today I'm troubleshooting some RF circuits, and I found a little guilt
about ground loops, So I check ...
0
votes
2answers
144 views
Should old electronics be polarized?
On old electronics that don't have a polarized power cord, what would be the benefits of adding a 2.2Mohm resistor from one side of the a/c to the chassis and switching out to a polarized cord ...
8
votes
1answer
361 views
To “ground fill”or not to “ground fill”?
I have been reading up on the EMI issues in Electromagnetic Compatibility
Engineering by Henry Ott. (wonderful book btw).
One of the topics "PCB Layout and Stackup" (aka Ch 16) there is section about ...
3
votes
2answers
501 views
Power supply noise in audio
I have what is surely a classic problem with regard to power supply switching noise and audio but I am unable to sort myth from reality with regard to what I found so far on the topic.
Setup:
I ...
2
votes
2answers
344 views
USB port and bench power supply ground difference
So I recently coughed up the $250 for a semi decent bench power supply, the thing that got me though is when powering a circuit from this unit and connecting the BusPirate via USB is that the ground ...
5
votes
2answers
680 views
Why we use ground
I have been wondering this for a while, so I did some digging, and as usual, wikipedia was the most illuminative. It looks like the telegraph was the first time ground was introduced to complete a ...
6
votes
2answers
383 views
Shielding and Ground loops
I have various pieces of equipment that all need to be connected to GND (Chassis GND). The issue I'm having is that I'm connecting an ADC card inside a computer through a metal box with custom ...
7
votes
2answers
467 views
Grounding of ADC grounds
Fast, high resolution ADCs, especially ones that have parallel output, usually have a separate supply pin (DRVDD, (drive vdd) or OVDD (output vdd)) presumably because they don't want to couple noise ...
3
votes
1answer
1k views
Dc isolation (transformer?)
I need to isolate the dc input from the dc current inside the circuit (both 9v), in the same way as a 1:1 transformer isolates the AC current inside the circuit from the input AC. I already found out ...
2
votes
3answers
2k views
Ground loop? Switch mode power supply noise
I have a single 12V supply powering a 12V class D audio amplifier (Tripath TA2020 based, model 'SMSL SA-36') (C) and a very cheap 12V to 5V 2A rated switch mode converter (A). The 5V is used to power ...
2
votes
2answers
399 views
Connecting Different Devices via RS232 - Worried about Ground Loops
This is sort of a follow up to my previous question regarding power supply for my telescope. The general advice I got was that I should just ditch regulation and connect the lead-acid battery directly ...
1
vote
3answers
377 views
Do I have a ground loop or another problem?
Okay, I know this is an electronics Q&A site, and this question is mildly computer related. But I've got this problem with my VGA monitor, a graphics card and a computer. The problem is the video ...
7
votes
4answers
405 views
Communication between microcontroller and separately powered PCB
On one board I have a microcontroller with one power supply and on another I have a Flip Flop with a separate power supply. I want to connect a pin of the microcontroller to the reset pin of the flip ...
4
votes
1answer
788 views
Isolation Transformers (Capacitive Coupling)
In my application I have an issue with ground loops and to solve this I require to have devices isolated from their drivers.
The system operates with a 13.56MHz signal and a wide bandwidth is not of ...
