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living with the lab - Louisiana Tech University
living with the lab - Louisiana Tech University

1. The following questions refer to the waveform shown below. a
1. The following questions refer to the waveform shown below. a

... 16. Practice Problem 9.5 from the textbook: Find the sinusoids corresponding to these phasors. (Or, stated using fancier terminology, transform these sinusoids from the phasor domain to the time domain.) (a) V = −25∠40° V ...
LP38843 3A Ultra Low Dropout Linear Reg
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... will typically also provide faster settling time on the output after a fast changing load transient occurs, but the ceramic capacitor is superior for bypassing high frequency noise. The output capacitor must be located less than one centimeter from the output pin and returned to a clean analog groun ...
A Compact High Voltage Nanosecond Pulse Generator
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... nanosecond pulser (Nanopulser) that could operate using a 9.6VDC Rechargeable Battery, with variable pulse durations of 20ns to 20μs and with variable pulse repetition rate (PRF) of 1 kHz to 6 kHz. The compact nanopulser can be broken down into three system blocks: 1) high voltage source block which ...
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HOME-BUILDING AMATEUR RADIO EQUIPMENT CHAPTER 2
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ce-b36 metal clad - Casagrande Elettrocostruzioni SpA

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Lightning Protection.. - Crawford Broadcasting
Lightning Protection.. - Crawford Broadcasting

... A good surge suppressor is the only way to minimize lightning transients on the incoming utility power. These devices range from inexpensive “kamikaze” devices that work one time and have to be replaced, to very expensive series/shunt devices. Somewhere in between is an economical device that will a ...
Direct ZVS start-up of a current
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altronic® ignition systems for industrial engines
altronic® ignition systems for industrial engines

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Spark-gap transmitter



A spark-gap transmitter is a device that generates radio frequency electromagnetic waves using a spark gap.Spark gap transmitters were the first devices to demonstrate practical radio transmission, and were the standard technology for the first three decades of radio (1887–1916). Later, more efficient transmitters were developed based on rotary machines like the high-speed Alexanderson alternators and the static Poulsen Arc generators.Most operators, however, still preferred spark transmitters because of their uncomplicated design and because the carrier stopped when the telegraph key was released, which let the operator ""listen through"" for a reply. With other types of transmitter, the carrier could not be controlled so easily, and they required elaborate measures to modulate the carrier and to prevent transmitter leakage from de-sensitizing the receiver. After WWI, greatly improved transmitters based on vacuum tubes became available, which overcame these problems, and by the late 1920s the only spark transmitters still in regular operation were ""legacy"" installations on naval vessels. Even when vacuum tube based transmitters had been installed, many vessels retained their crude but reliable spark transmitters as an emergency backup. However, by 1940, the technology was no longer used for communication. Use of the spark-gap transmitter led to many radio operators being nicknamed ""Sparks"" long after they ceased using spark transmitters. Even today, the German verb funken, literally, ""to spark,"" also means ""to send a radio message or signal.""
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