Timeline for Low "Hum" Frequency Detector
Current License: CC BY-SA 3.0
14 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Jun 18, 2016 at 17:07 | history | protected | Dave Tweed | ||
| Nov 25, 2013 at 20:03 | answer | added | EMF Hummer | timeline score: 2 | |
| Nov 25, 2011 at 1:36 | vote | accept | Larry Morries | ||
| Nov 6, 2011 at 7:52 | answer | added | Konsalik | timeline score: 4 | |
| Oct 10, 2011 at 1:49 | comment | added | Larry Morries | there is no electrical transformer on a pole outside. I am still trying to find how to create a device so that I can detect the source of the "low hum" sound. | |
| Oct 8, 2011 at 4:02 | history | tweeted | twitter.com/#!/StackElectronix/status/122522315727712256 | ||
| Oct 7, 2011 at 5:40 | comment | added | user6030 | Is there an electrical transformer on a pole outside? If so, consider it a possibility. You might go outside at night and check if you still hear the hum. | |
| Oct 4, 2011 at 1:02 | comment | added | Larry Morries | @Martin, If I can't build a useful directional finder for low frequencies, are there other ways to decrease that noise without spending too much resources? | |
| Oct 4, 2011 at 1:01 | comment | added | Larry Morries | @Majenko, Interesting observation you have. I was thinking of building such device so that I know where is the source of that hum sound. Right now, even I shut down all my electrical devices, I still hear it especially during night time. I just want to know where is that noise by using a device. | |
| Oct 3, 2011 at 12:13 | comment | added | Martin | In addition to the transmission through the fabric of the building, there is the boundary effect. "A boundary creates a 6dB lift at low frequencies, and this isn't limited to the back wall of a studio -- it's just where most people seem to notice it first." So you can't build a useful directional finder for low frequencies. | |
| Oct 3, 2011 at 10:26 | comment | added | Majenko | The problem with low hums is they have a tendancy to transmit through the fabric of the building. I had a pair of hard drives in a server that were resonating with each other in a sort of feedback loop and they created a low frequency wom-wom-wom noise (almost dub-step). Spent ages working out where it came from - it was louder the other end of the building compared to where the server was. Eventually found it only when I noticed the sound was gone when the server was off. New hard drives cured that one. | |
| Oct 3, 2011 at 9:14 | comment | added | Larry Morries | @Majenko, I was looking to build a detector to detect a low "hum" sound (to me, it is consider noise) but I believe it is a low frequency (you can still correct me - maybe you are the expert in this field). The objective would be to detect that sound and find where it is exactly located at. | |
| Oct 3, 2011 at 8:51 | comment | added | Majenko | How are you wanting to do the detection? Are you looking at a microphone in free-air, a direct electrical connection to some noise generating device, what? And how do you want to represent the detected frequency? Do you want to know that the frequency is there, or do you want to measure what the actual frequency is? | |
| Oct 3, 2011 at 5:36 | history | asked | Larry Morries | CC BY-SA 3.0 |