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Electric and Magnetic Fields - Homework 5
Electric and Magnetic Fields - Homework 5

... (a) Explain why a wire can only carry a current if it is part of an electrical circuit. (b) State Kirchoff’s laws for electrical circuits, and describe which physical principles underly them. (c) Consider the set of resistors shown in figure 1. Show that the effective resistance of this configuratio ...
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... enables designers to build multistage filters in single-supply systems and to maintain high signal-to-noise ratios. The OP191/OP291/OP491 are specified over the extended industrial –40°C to +125°C temperature range. The OP191 single and OP291 dual amplifiers are available in 8-lead plastic SOIC surf ...
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Valve RF amplifier



A valve RF amplifier (UK and Aus.) or tube amplifier (U.S.), is a device for electrically amplifying the power of an electrical radio frequency signal.Low to medium power valve amplifiers for frequencies below the microwaves were largely replaced by solid state amplifiers during the 1960s and 1970s, initially for receivers and low power stages of transmitters, transmitter output stages switching to transistors somewhat later. Specially constructed valves are still in use for very high power transmitters, although rarely in new designs.
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