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The Tweet-a-watt [13] is a hacked version of the standard Kill-A-Watt Plug in Power Meter. By piggybacking on the device's on-board LM2902N op-amp chip, the creator was able to get readings for voltage and current and transmit to a computer, which then sent this to Twitter via handle @tweetawatt. [ 14 ]
The operation of a lock-in amplifier relies on the orthogonality of sinusoidal functions.Specifically, when a sinusoidal function of frequency f 1 is multiplied by a sinusoidal function of another frequency f 2 and integrated over a time much longer than the period of the two functions, the result is close to zero.
The non-idealities of the power devices account for the bulk of the power losses in the converter. Both static and dynamic power losses occur in any switching regulator. Static power losses include (conduction) losses in the wires or PCB traces, as well as in the switches and inductor, as in any electrical circuit. Dynamic power losses occur as ...
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Paul Voigt patented a negative feedback amplifier in January 1924, though his theory lacked detail. [4] Harold Stephen Black independently invented the negative-feedback amplifier while he was a passenger on the Lackawanna Ferry (from Hoboken Terminal to Manhattan) on his way to work at Bell Laboratories (located in Manhattan instead of New Jersey in 1927) on August 2, 1927 [5] (US Patent ...
Earth Sound Research specialized in electric bass and guitar amplifiers in the 1970s. [3] They also manufactured PA mixers, power amps, [4] and stand alone solid state reverb units. The company also manufactured ESR brand distortion pedals such as the Graphic Fuzz which was based somewhat on a Craig Anderton fuzz and volume pedal. [1]