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Bourns® Chip Resistors
Bourns® Chip Resistors

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Next generation of quantum voltage systems for wide range
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... changes direction, it is called alternating current, or a.c.. • Mains electricity is an a.c. supply, with the UK mains supply being about 230V. • It has a frequency of 50Hz (50 hertz), which means it changes direction, and back again, 50 times a second. • The diagram shows an oscilloscope screen dis ...
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Click here for presentation material

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... load current. f is divided from the base clock, half for G=1/2; one-third for G=2/3; and LDO control for G=1. In other control methodology, such as PFM and PWM, d or f varies with both input voltage and load current, it can not achieve small ripple under all conditions. But when the load resistor be ...
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... bypassed error amplifier. With the regulator input voltage of 26V and full load on all outputs, the frequency response has a crossover frequency at 1 kHz and phase margin of 90˚. The flyback regulator’s mode of operation is continuous, so a large primary inductance (LP = 300 µH) is needed for the tr ...
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... If electricity companies transmitted electricity at 240 volts through overhead power lines there would be too much ______ loss by the time electricity reaches our homes. This is because the current is ___. To overcome this they use devices called transformers to “step up” the voltage onto the power ...
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... This is clearly not suitable as a DC power source since the load is looking for a constant DC value. This is where the capacitor, C, and the LM78XX voltage regulator of Figure 1 become important. A typical voltage regulator requires that the voltage on the input pin maintain a certain margin above t ...
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Electrical ballast



An electrical ballast is a device intended to limit the amount of current in an electric circuit. A familiar and widely used example is the inductive ballast used in fluorescent lamps, to limit the current through the tube, which would otherwise rise to destructive levels due to the tube's negative resistance characteristic.Ballasts vary in design complexity. They can be as simple as a series resistor or inductor, capacitors, or a combination thereof or as complex as electronic ballasts used with fluorescent lamps and high-intensity discharge lamps.
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