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2 - Science @ St John`s
2 - Science @ St John`s

... F Mix some hot and cold water so that the temperature of the mixture is about 10 °C hotter than the air in the room. G Switch off the circuit and carefully put the thermistor into the beaker of hot water. Take care not to spill the water onto other electrical equipment. Wait for a minute to make sur ...
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... Lawrence Technological University ...
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... CTs step the primary current down to a nominal secondary level for use by protective relays, meters, and other monitoring devices. CTs perform reasonably in most operating scenarios, faithfully reproducing primary current as a secondary current, with little distortion or error CTs for transmission l ...
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... • Using this design is more costly, larger in terms of space required but a safer design - easier to set up, more adjustable, greater tolerance to problems • This will more closely follow the MTA design, which is proven, expert advice says it should be done this way • The hybrid will isolate the amp ...
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... 68HC11’s timer/counter hardware allows TOC5 output pin to automatically toggle state after a particular period of time and generate an interrupt to schedule the next toggle point Disable & re-enable interrupts during timing-sensitive tasks ...
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... Two models are available with voltage ranges to 300V and current ranges to 3000mA. Operating modes include constant voltage or constant current with automatic crossover. In addition, the Model 250V offers a constant power operating mode. Operation may be timed or continuous. All parameters, includin ...
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... capacitance from Crss. This is done by driving the gates of cascodes J3 and J4 with a replica of the feedback signal that is fed to the gate of J2. This is referred to as a driven cascode. Although the cascode circuits illustrated here are all differen al cascodes, all of the principles and technique ...
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... is turned on. Therefore, determines the saturation characteristics of the main amplifier, which, in turn, affects gain flatness, efficiency, and linearity. Equation (3) implies that the gain ratio between the two amplifiers is and, furthermore, the gain of the auxiliary amplifier should be greater t ...
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Switched-mode power supply



A switched-mode power supply (switching-mode power supply, switch-mode power supply, SMPS, or switcher) is an electronic power supply that incorporates a switching regulator to convert electrical power efficiently. Like other power supplies, an SMPS transfers power from a source, like mains power, to a load, such as a personal computer, while converting voltage and current characteristics. Unlike a linear power supply, the pass transistor of a switching-mode supply continually switches between low-dissipation, full-on and full-off states, and spends very little time in the high dissipation transitions, which minimizes wasted energy. Ideally, a switched-mode power supply dissipates no power. Voltage regulation is achieved by varying the ratio of on-to-off time. In contrast, a linear power supply regulates the output voltage by continually dissipating power in the pass transistor. This higher power conversion efficiency is an important advantage of a switched-mode power supply. Switched-mode power supplies may also be substantially smaller and lighter than a linear supply due to the smaller transformer size and weight.Switching regulators are used as replacements for linear regulators when higher efficiency, smaller size or lighter weight are required. They are, however, more complicated; their switching currents can cause electrical noise problems if not carefully suppressed, and simple designs may have a poor power factor.
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