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TM_403
TM_403

... a.c., i.e. it can flow from the live wire through the appliance to the neutral wire and vice ...
BAW56 Small Signal Diode
BAW56 Small Signal Diode

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COOPER LIGHTING - SURE

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PPS 6 - Devchand College
PPS 6 - Devchand College

... illuminated, the LDR has a resistance of more than 100KΩ( known as dark resistance). When illuminated, the resistance falls to only a few hundred ohms. These resistors are used in photoelectric counter, light meter, as on-off switch & in photoelectric relay circuit. It is also used in voltage regula ...
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ADP3334 数据手册DataSheet 下载

... values for the output capacitor because they are difficult to stabilize due to the uncertainty of load capacitance and resistance. Moreover, the ESR value, required to keep conventional LDOs stable, changes depending on load and temperature. These ESR limitations make designing with LDOs more diffic ...
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Alternating Current and Voltages

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This is a first-order filter design problem. Firstly, we need to find the

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NSS35200MR6 - 35 V, 5 A, Low VCE(sat) PNP Transistor

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Chapter 3 - Lab 2: Filters and Operational Amplifiers

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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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