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Set No: 1
Set No: 1

... arm bc is a non-reactive resistor R3 in parallel with a standard capacitor C3; arm CD is a non-reactive resistor R4 in parallel with a standard capacitor C4; arm da is a standard air capacitor of capacitance C2.Without the specimen between the electrodes, balance is obtained with the following value ...
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Temperature sensors and voltage references implemented in CMOS
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... emitted by the appliance and their effects onto mains: • harmonics for currents up to 16A in compliance with EN61000-3-2 • harmonics for currents from 16A to 75A in compliance with EN61000-3-12 • flicker (voltage fluctuation) for currents up to 16A in compliance with EN61000-3-3 • flicker (voltage ...
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... have a non-zero source resistance (or Output Resistance). In a similar way we can expect all real amplifiers and signal sources to exhibit a non-zero capacitance. This is called the Source Capacitance for a source/sensor and the Input Capacitance for an amplifier. From figure 13.1 we can see that 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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