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Resistors in Series and Parallel Circuits
Resistors in Series and Parallel Circuits

... have a total resistance that equals the sum of their individual resistances, and that when resistors area added in parallel to a circuit, they have a total resistance that is less than the individual resistances. Use a voltmeter, an ameter to measure the voltage across parts of the series and parall ...
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BD244/ A/B/ C PNP Epitaxial Silicon Transistor
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... DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF FAIRCHILD SEMICONDUCTOR INTERNATIONAL. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, or (c) whose failure to perform when ...
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Heating of Conductor by Electric Current
Heating of Conductor by Electric Current

... carbonizes gradually. If you have a demonstrational ammeter with range at least 10 A, you can demonstrate the temperature-resistivity dependence of both metal and graphite. After they get hot, blow some air on them – they will get cooler. The spring conducts higher current if cooled, the graphite co ...
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... The signal bandwidth used in portable or autonomous sensor systems is often lower than 50kHz with ADC requiring about 8 to 10 bits resolution, but the consumed power must be very low: few µW or a FOM = P/(2ENoBfsampl) lower than 0.1pJ/conversion-step. To achieve this target, the successive approxima ...
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... 12. So, what else do we need? Remember that voltage is an energy difference between two points. PSpice calculates voltages at each circuit node, with reference to ground, so every PSpice circuit needs a ground. Each node has a number, and the software recognizes the ground as node 0. Go to the Place ...
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Adobe Acrobat file ()
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... The instantaneous voltage across the resistor is in phase with the current The instantaneous voltage across the inductor leads the current by 90° The instantaneous voltage across the capacitor lags the current by 90° ...
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... compensation, a comparator, and an opendrain output transistor. The comparator compares the actual magnetic flux through the Hall plate (Hall voltage) with the fixed reference values (switching points). Accordingly, the output transistor is switched on or off. The sensors of this family differ in th ...
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Resistive opto-isolator



Resistive opto-isolator (RO), also called photoresistive opto-isolator, vactrol (after a genericized trademark introduced by Vactec, Inc. in the 1960s), analog opto-isolator or lamp-coupled photocell, is an optoelectronic device consisting of a source and detector of light, which are optically coupled and electrically isolated from each other. The light source is usually a light-emitting diode (LED), a miniature incandescent lamp, or sometimes a neon lamp, whereas the detector is a semiconductor-based photoresistor made of cadmium selenide (CdSe) or cadmium sulfide (CdS). The source and detector are coupled through a transparent glue or through the air.Electrically, RO is a resistance controlled by the current flowing through the light source. In the dark state, the resistance typically exceeds a few MOhm; when illuminated, it decreases as the inverse of the light intensity. In contrast to the photodiode and phototransistor, the photoresistor can operate in both the AC and DC circuits and have a voltage of several hundred volts across it. The harmonic distortions of the output current by the RO are typically within 0.1% at voltages below 0.5 V.RO is the first and the slowest opto-isolator: its switching time exceeds 1 ms, and for the lamp-based models can reach hundreds of milliseconds. Parasitic capacitance limits the frequency range of the photoresistor by ultrasonic frequencies. Cadmium-based photoresistors exhibit a ""memory effect"": their resistance depends on the illumination history; it also drifts during the illumination and stabilizes within hours, or even weeks for high-sensitivity models. Heating induces irreversible degradation of ROs, whereas cooling to below −25 °C dramatically increases the response time. Therefore, ROs were mostly replaced in the 1970s by the faster and more stable photodiodes and photoresistors. ROs are still used in some sound equipment, guitar amplifiers and analog synthesizers owing to their good electrical isolation, low signal distortion and ease of circuit design.
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