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WCL488 Series 402828 Rev B1
WCL488 Series 402828 Rev B1

... device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference when equipment is operated in a commercial environment. This equipment generates, uses, and can radiate radio frequency energy; and, if not installed and used in acco ...
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... accurate record of available charge in Li-ion or Li-polymer batteries. The bq2084-V150 monitors capacity and other critical parameters of the battery pack and reports the information to the system host controller over a serial communication bus. It is designed to work with the bq29312A AFE protectio ...
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Everything you wanted to know about optical networking
Everything you wanted to know about optical networking

... • The signal is inversely proportional to the distance squared. • A signal travels distance X and loses half of its intensity. • The signal travels another distance X and loses another half. • After 2X only 25% remains, after 3X only 12.5% remains. ...
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... transmission lines must have symmetry: all the conductors must have the same resistance and their spatial disposition is such that when the conductors are traversed by a balanced set of currents, ab, bc, ca constitute a balanced set of fluxes as well. This happens when the line has physical symme ...
2. octopus system installation
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... 1. Determine the number of conduits to be connected to the Octobox. For example, this could be eight (8) conduits (7 letters plus 1 MPS, as in Figure 14). 2. Remove the appropriate number of knockouts. 3. Determine the length of metal conduit required from the back of the channel letter. 4. Cut the ...
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... • The signal is inversely proportional to the distance squared. • A signal travels distance X and loses half of its intensity. • The signal travels another distance X and loses another half. • After 2X only 25% remains, after 3X only 12.5% remains. ...
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... three protocols to be used interchangeably over a single cable or connector with no additional switching components. Full operation requires only four external charge pump capacitors. The RS-485/422 modes feature one driver and one receiver (1TX/1RX) in both half and full duplex configurations. The ...
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... capacitor with a constant current. The oscillator output is input to the timing signal generator circuit, which produces the LED drive pulses and the timing pulses used for digital signal processing. (b) LED Drive Circuit This circuit uses the LED drive pulses produced by the timing signal generator ...
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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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