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Chapter 6: Transistors and Gain
Chapter 6: Transistors and Gain

... Bipolar transistors are essentially two diodes placed back to back. This may seem like a silly thing to do but the diodes are not the same. When current flows through one diode it provides carriers to carry current through the other part of the element. Thus, in its most basic form, a transistor is ...
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... For the capacitive circuit: vC = 362 sin (ωt - 33˚) V iC = 94 sin (ωt + 57˚) mA C = 2.2 μF Determine the frequency ...
Load-commutated Current Source Inverter (CSI)
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... transistor. With a properly selected resistor R1, the voltage at the base of the transistor in the dark state is less than 0.7 V, and therefore the transistor is in the cut-off state. As the photoresistor’s resistance decreases (as the result of an increase in light intensity), the base voltage incr ...
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... Limiting values are given in accordance with the Absolute Maximum Rating System (IEC 134). Stress above one or more of the limiting values may cause permanent damage to the device. These are stress ratings only and operation of the device at these or at any other conditions above those given in the ...
Constant Current Power Supplies
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... Rg, is very low when compared to the load, then it is said to be “stiff” and approximates a pure voltage source. Voltage drop across Rg is negligible underload . If Rg is very large compared to the load resistance RL, and the source voltage is increased, a changing load resistance will have very lit ...
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... protection) are in force for equipment employing products listed in this datasheet. 4. The products in this datasheet are not developed, designed, or approved for use with such equipment whose failure of malfunction can be reasonably expected to directly endanger the life of, or cause significant in ...
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Application of photodiodes - Biosystems and Agri Engineering

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TRIAC



TRIAC, from triode for alternating current, is a genericized tradename for an electronic component that can conduct current in either direction when it is triggered (turned on), and is formally called a bidirectional triode thyristor or bilateral triode thyristor.TRIACs are a subset of thyristors and are closely related to silicon controlled rectifiers (SCR). However, unlike SCRs, which are unidirectional devices (that is, they can conduct current only in one direction), TRIACs are bidirectional and so allow current in either direction. Another difference from SCRs is that TRIAC current can be enabled by either a positive or negative current applied to its gate electrode, whereas SCRs can be triggered only by positive current into the gate. To create a triggering current, a positive or negative voltage has to be applied to the gate with respect to the MT1 terminal (otherwise known as A1).Once triggered, the device continues to conduct until the current drops below a certain threshold called the holding current.The bidirectionality makes TRIACs very convenient switches for alternating-current (AC) circuits, also allowing them to control very large power flows with milliampere-scale gate currents. In addition, applying a trigger pulse at a controlled phase angle in an AC cycle allows control of the percentage of current that flows through the TRIAC to the load (phase control), which is commonly used, for example, in controlling the speed of low-power induction motors, in dimming lamps, and in controlling AC heating resistors.
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