A quick video dealing with claims that a power cord that is not driving something can't be source of AC interference:
-
WANTED: Happy members who like to discuss audio and other topics related to our interest. Desire to learn and share knowledge of science required. There are many reviews of audio hardware and expert members to help answer your questions. Click here to have your audio equipment measured for free!
Testing Open Power Cord interference in Interconnect Cables (video)
- Thread starter amirm
- Start date
OP
- Thread Starter
- #3
Good feedback. Bonus is that it is easier for me to produce them as well.
Love these “Schooling” Videos. We learn so much and disprove all the myth’s and magic sauces that are used by Sales and Marketing people to sell us crap we don’t need and does nothing except extract money from us. Keep them coming! 
fieldcar
Addicted to Fun and Learning
This reminds me of how home wiring can have a phantom voltage when the switch at the wall is off and you've unwired the line from the device. There is often up to 120VAC, but if you short it to ground, you quickly find that there was never any current behind it, and it was simply created by induction of a parallel run from a nearby live wire. This is why some electrician meters have a Lo-Z mode.
Vive la dissonance!
Member
I'm going to be contrarian guy and say I'd rather read it. I love reading, and for me reading is way, way faster than the time a video of the same content requires.Thanks for the quick vid. This format is more attractive to people who don't want to dive to deep (or dislike reading in general) and could definitely help some folks save their money in the future
Usually iam on your side, reading is great. But sometimes a video is just greater.
Vive la dissonance!
Member
It's not an impossibility.
Didn't watch the video (can't at work), but who made the claim a power cord could not be an interference source unless it was driving something? Plug it in, and there is a voltage field created, even if the current is practically zero, and you have a 60 Hz (or whatever) high-voltage source plus whatever noise is on the line.
- Joined
- Oct 25, 2019
- Messages
- 11,898
- Likes
- 16,285
The guy from GR Research. Beef!
Ah, 'nuff said. Doubters could just take an extension cord, plug it in (to the wall, no load), and wrap it around an AM radio to see what happens.
Danny @ GR Research.
Freeway
Senior Member
- Joined
- Apr 10, 2021
- Messages
- 325
- Likes
- 385
Haha who had thought that testing a yeah lets say "a not so good speaker" could be a inspiration for such a good video?
Prominently displayed in the background is it?
HansHolland
Active Member
The open mains cable is just an antenna.
Ok, a bad antenna.
Ok, a bad antenna.
hoverdonkey
Active Member
- Joined
- Oct 6, 2019
- Messages
- 133
- Likes
- 91
azzy_mazzy
Member
- Joined
- May 31, 2020
- Messages
- 79
- Likes
- 88
i agree, for me its the better format.Thanks for the quick vid. This format is more attractive to people who don't want to dive to deep (or dislike reading in general) and could definitely help some folks save their money in the future
^^^This is Professor Bit-perfect Amir, preparing to Cast a Stupify spell with a Power Wand!^^^
Please don’t try this at home.
Someone please turn this into a gif!
Parasitic capacitance! This also explains why "zero crosstalk" is a myth in HiFi, and part of why we see a rising trend curve on crosstalk vs frequency graphs (because capacitive reactance is inversely proportional to frequency). Fun!
Similar threads
