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NE570 Compandor
NE570 Compandor

Detection of Atmospheric Infrasound
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... The information presented in this document does not form part of any quotation or contract, it is believed to be accurate and reliable and may be changed without notice. No liability will be accepted by the publisher for any consequence of its use. Publication thereof does not convey nor imply any l ...
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... made at more than 1000 Hz frequency getting very low dead time. The VEC205E is an economical, monoboard architecture, plug in, reliable and good performance product. The VEC205E has some incorporated functions and protections. The control signal type could be chosen when ordering. The voltage sensin ...
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Report on waist dependence of photo
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... and 10Gbps systems employing optical amplifiers. It supports data rates up to 11.3 Gbps. This amplifier provides a differential output voltage that is proportional to an applied current at its input port. This current is typically provided by a photodiode. Operating from a single +3.3V supply, the H ...
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... electronic scan switch to a CRT. The composite amplitude of the signal within each filters bandwidth is displayed as a function of the overall frequency range of the filter.  Therefore, the frequency range of the instrument is limited by the number of filters and their bandwidth. The electronic swi ...
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... 1. To determine open circuit characteristics of the given DC generator separately excited and obtain the critical resistance at its rated speed. 2. To determine load characteristics of the given DC generator separately excited. PRELAB: 1. What are the different types of DC machines? 2. What do criti ...
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... contacts depending on the desired operation.  In a smoke detector circuit the photo diode is attached to a relay switch, this switch is normally closed and attached to the fire alarm. When the photo diode conducts it picks up the relay switch, this causes the normally closed switch to open preventi ...
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... resistor near the apex of the probe tip. This resistor is incorporated into a Wheatstone bridge circuit which allows the system to monitor the resistance. The resistance correlates with the temperature at the end of the probe, which can be used to both monitor the temperature of a sample as well as ...
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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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