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2. Computer fan control - Wikipedia

   en.wikipedia.org/wiki/Computer_fan_control

   The control signal is a square wave operating at 25 kHz, with the duty cycle determining the fan speed. 25 kHz is used to raise the sound of the signal above the range of human hearing; use of a lower frequency could produce an audible hum or whine. Typically a fan can be driven between about 30% and 100% of the rated fan speed, using a signal ...

3. Twelve-inch single - Wikipedia

   en.wikipedia.org/wiki/Twelve-inch_single

   A twelve-inch Capitol Records gramophone record. The twelve-inch single (often written as 12-inch or 12″) is a type of vinyl (polyvinyl chloride or PVC) gramophone record that has wider groove spacing and shorter playing time with a "single" or a few related sound tracks on each surface, compared to LPs (long play) which have several songs on each side.

4. Thermoacoustic heat engine - Wikipedia

   en.wikipedia.org/wiki/Thermoacoustic_heat_engine

   Thermoacoustic engines (sometimes called "TA engines") are thermoacoustic devices which use high-amplitude sound waves to pump heat from one place to another (this requires work, which is provided by the loudspeaker) or use a heat difference to produce work in the form of sound waves (these waves can then be converted into electrical current ...

5. Rotary woofer - Wikipedia

   en.wikipedia.org/wiki/Rotary_woofer

   A rotary woofer is designed to produce only frequencies lower than 20 Hz; distortion increases as the input frequency exceeds the fan's rotation rate (20 Hz would be about 1200 rpm for the fan). Fan RPM is limited to reduce the constant noise generated by the fan blades. Current models typically spin at around 800 RPM (13 Hz).

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   Discover the latest breaking news in the U.S. and around the world — politics, weather, entertainment, lifestyle, finance, sports and much more.

7. Talk:Twelve-inch single - Wikipedia

   en.wikipedia.org/wiki/Talk:Twelve-inch_single

   Indeed, the very first 12‑inch vinyl album in 1948, Mendelssohn's Concerto in E Minor featured only three tracks (one 11-minute long suite on side one, and two tracks on side two taking up 14 minutes in total) and was extended play (EP) in appearance, rather than a typical album with multiple tracks each being on average 2–4 minutes such as ...