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  2. Scientific pitch - Wikipedia

    en.wikipedia.org/wiki/Scientific_pitch

    Scientific pitch, also known as philosophical pitch, Sauveur pitch or Verdi tuning, is an absolute concert pitch standard which is based on middle C (C 4) being set to 256 Hz rather than ~ 261.63 Hz, [a] making it ~ 31.77 cents lower than the common A440 pitch standard.

  3. Crystal oscillator frequencies - Wikipedia

    en.wikipedia.org/wiki/Crystal_oscillator_frequencies

    Digital signal generator Exact frequency is 2^28/10 Hz. Used to drive a DDS synthesizer with 28-bit accumulator; gives output from 0 to 2.68435 MHz in 0.1 Hz steps. Instek SFG-1000 series is one example. 26.975 RC 27 MHz band, band 0/1 (grey/brown), "split" frequency; radio-controlled models of cars, boats, aircraft [29] 26.995 RC

  4. Induction generator - Wikipedia

    en.wikipedia.org/wiki/Induction_generator

    Prime mover speed should be used to generate frequency of 60 Hz: Typically, slip should be similar to full-load value when machine is running as motor, but negative (generator operation): if Ns = 1800, one can choose N=Ns+40 rpm Required prime mover speed N = 1800 + 40 = 1840 rpm.

  5. Signal generator - Wikipedia

    en.wikipedia.org/wiki/Signal_generator

    A signal generator is one of a class of electronic devices that generates electrical signals with set properties of amplitude, frequency, and wave shape. These generated signals are used as a stimulus for electronic measurements, typically used in designing, testing, troubleshooting, and repairing electronic or electroacoustic devices, though it often has artistic uses as well.

  6. Amazon Prime - Wikipedia

    en.wikipedia.org/wiki/Amazon_Prime

    Amazon Prime electric delivery vans in north London. In 2005, Amazon announced Amazon Prime as a membership service offering free two-day shipping within the contiguous United States on all eligible purchases for an annual fee of $79 (equivalent to $123 in 2023) [4] and discounted one-day shipping rates. [5]

  7. List of Amazon products and services - Wikipedia

    en.wikipedia.org/wiki/List_of_Amazon_products...

    In 2005, Amazon announced the creation of Amazon Prime, a membership offering free two-day shipping within the contiguous United States on all eligible purchases for a flat annual fee of $79 (equivalent to $123 in 2023), [14] as well as discounted one-day shipping rates. [15]

  8. Audio frequency - Wikipedia

    en.wikipedia.org/wiki/Audio_frequency

    An audio frequency or audible frequency (AF) is a periodic vibration whose frequency is audible to the average human. The SI unit of frequency is the hertz (Hz). It is the property of sound that most determines pitch. [1] The generally accepted standard hearing range for humans is 20 to 20,000 Hz.

  9. Frequency synthesizer - Wikipedia

    en.wikipedia.org/wiki/Frequency_synthesizer

    A frequency synthesizer is an electronic circuit that generates a range of frequencies from a single reference frequency. Frequency synthesizers are used in devices such as radio receivers , televisions , mobile telephones , radiotelephones , walkie-talkies , CB radios , cable television converter boxes , satellite receivers, and GPS systems.