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  2. Phantom power - Wikipedia

    en.wikipedia.org/wiki/Phantom_Power

    Phantom power is sometimes used by workers in avionics to describe the DC bias voltage used to power aviation microphones, which use a lower voltage than professional audio microphones. Phantom power used in this context is 8–16 volts DC in series with a 470 ohm (nominal) resistor as specified in RTCA Inc. standard DO-214. [19]

  3. Frequency mixer - Wikipedia

    en.wikipedia.org/wiki/Frequency_mixer

    Frequency mixer symbol. In electronics, a mixer, or frequency mixer, is an electrical circuit that creates new frequencies from two signals applied to it.In its most common application, two signals are applied to a mixer, and it produces new signals at the sum and difference of the original frequencies.

  4. Douglas A-4 Skyhawk - Wikipedia

    en.wikipedia.org/wiki/Douglas_A-4_Skyhawk

    At the time, the F-4 Phantom was just beginning to be exploited to its full potential as a fighter and had not performed as well as expected against the smaller North Vietnamese MiG-17 and MiG-21 opponents. TOPGUN introduced the notion of dissimilar air combat training (DACT) using modified A-4E/Fs. Modified aircraft, called "Mongoose", lost ...

  5. Frequency changer - Wikipedia

    en.wikipedia.org/wiki/Frequency_changer

    Often airplanes use 400 Hz power so a 50 Hz or 60 Hz to 400 Hz frequency converter is needed for use in the ground power unit used to power the airplane while it is on the ground. Airlines might also utilize the converters to provide in-air wall current to passengers for use with laptops and the like.

  6. Pentagrid converter - Wikipedia

    en.wikipedia.org/wiki/Pentagrid_converter

    The pentagrid converter is a type of radio receiving valve (vacuum tube) with five grids used as the frequency mixer stage of a superheterodyne radio receiver. The pentagrid was part of a line of development of valves that were able to take an incoming RF signal and change its frequency to a fixed intermediate frequency , which was then ...

  7. Food poisoning is extremely common. But that doesn't ... - AOL

    www.aol.com/food-poisoning-extremely-common...

    Here's what causes food poisoning, when you should be worried and what can be done to prevent having to experience it in the first place.

  8. Electric power conversion - Wikipedia

    en.wikipedia.org/wiki/Electric_power_conversion

    A power converter is an electrical device for converting electrical energy between alternating current (AC) and direct current (DC). It can also change the voltage or frequency of the current. Power converters include simple devices such as transformers, and more complex ones like resonant converters.

  9. Phantom circuit - Wikipedia

    en.wikipedia.org/wiki/Phantom_circuit

    A phantom group is composed of three circuits that are derived from two single-channel circuits to form a phantom circuit. Here the phantom circuit is a third circuit derived from two suitably arranged pairs of wires, called side circuits, with each pair of wires being a circuit in itself and at the same time acting as one conductor of the ...

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