Timeline for High frequency mains transmission
Current License: CC BY-SA 2.5
11 events
| when toggle format | what | by | license | comment | |
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| Jan 1, 2021 at 2:11 | comment | added | alejnavab | "But imagine all the appliances in your house buzzing at 1 kHz" // It would hum at twice that frequency, 2 kHz. en.m.wikipedia.org/wiki/Mains_hum | |
| Nov 25, 2010 at 22:12 | vote | accept | Thomas O | ||
| Nov 23, 2010 at 4:18 | comment | added | W5VO | Switch mode power supplies use frequencies 50kHz - 1MHz+ to reduce the size of transformers and inductors. | |
| Nov 23, 2010 at 0:42 | comment | added | markrages | read the chart more carefully. The Y-axis is SPL and the lines are equal loudness. So a 20 dB SPL at 1 kHz sounds as loud as a 57 dB SPL at 60 Hz. | |
| Nov 22, 2010 at 22:56 | comment | added | Thomas O | The chart seems to indicate 1kHz AC or so would actually be quieter than 50/60 Hz. | |
| Nov 22, 2010 at 20:24 | history | edited | markrages | CC BY-SA 2.5 |
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| Nov 22, 2010 at 20:20 | comment | added | Kortuk | @Markrages, nice, most people do not understand that our ears bias certain frequencies. | |
| Nov 22, 2010 at 20:19 | comment | added | Jesse | A lot of inexpensive clocks count the cycles from their mains supply to use as their timebase. Turns out that while not super-precise over short time spans, the mains supply is very accurate when measured over days. They have to keep precise frequency to aid in load balancing and synchronizing generators. | |
| Nov 22, 2010 at 19:58 | history | edited | markrages | CC BY-SA 2.5 |
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| Nov 22, 2010 at 17:21 | comment | added | Thomas O | Cheap alarm clocks I've found use transformers. Also, an older scope I had used one. But SMPS supplies are becoming cheaper than transformers nowadays so you see them more. | |
| Nov 22, 2010 at 16:31 | history | answered | markrages | CC BY-SA 2.5 |