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Electronic Metronome
Electronic Metronome

clampers - Book Spar
clampers - Book Spar

T3000 Frequency Relay
T3000 Frequency Relay

www.physicspaathshala.org
www.physicspaathshala.org

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Paper - Colorado State University College of Engineering
Paper - Colorado State University College of Engineering

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Unregulated Power Supply Tutorial: Hey! Why is my 9V wall
Unregulated Power Supply Tutorial: Hey! Why is my 9V wall

... mounting holes in the PCB for what seems to be a bridge rectifier for higher output voltages using the same transformer. In addition, there is a simple filter capacitor to smooth the rectified signal. Why do get 10 Volts on a 6VDC supply? In short, when you measure the open circuit voltage of this e ...
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... An embedded microprocessor consumes 0.72 mW/MHz (excluding leakage power) when fabricated using a 0.18 µm process. With typical standard cells (gates), the area of the processor is 2 mm2. Assume a 600 MHz clock frequency, and 1.8 V power supply. Its leakage power is 50µW. Assume short channel devic ...
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Lecture 9: Limiting and Clamping Diode Circuits. Voltage Doubler
Lecture 9: Limiting and Clamping Diode Circuits. Voltage Doubler

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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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