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January-February p48-78
January-February p48-78

... exact methods employed for a specific product. The signals may be captured by variations of the configuration of figure 2. Also, some of the units use a microprocessor to perform the analysis, while others use electronic circuitry to perform a direct analysis. The characteristics presented in this a ...
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1. Higher Electricity Questions [pps 1MB]

Beam Diagnostic Requirements for Bunched Beam Cooling Demo
Beam Diagnostic Requirements for Bunched Beam Cooling Demo

... 1D Signal Calculation for Gaussian Bunch and Ring-shape Pickup Gaussian bunch shape distribution (black) in 7ns (rms) bunch length current picked up by 50  shunt impedance’s voltage (red, calculation) and comparison to the experimental data (blue) for one of 12C+6 bunches accelerated in the CSRm r ...
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Manual MultiPlus 12 | 3000 | 120 - 50 | 120V

Two-Wire Current Loop Powered Indicators
Two-Wire Current Loop Powered Indicators

L9177 Datasheet - STMicroelectronics
L9177 Datasheet - STMicroelectronics

... The two channels injector drivers, the O2 sensor heater and two relay drivers can be controlled both with parallel input and with SPI interface. One additional relay driver and the lamp driver are controlled by SPI. The stepper motor driver is designed for a double winding coil motor, used for engin ...
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Sample 243-133-VA Electrical Technology Assessments
Sample 243-133-VA Electrical Technology Assessments

... a) If the wire is run in a room where the ambient temperature is 20°C, which copper conductor (AWG 12 or AWG 10) would you choose? Show your work. (AWG 12) b) If you were required to operate the motor in an unheated shed where the temperature could vary between -40°C and +40°C, depending on the seas ...
OBDH – PSU Interface
OBDH – PSU Interface

PARALLEL UNIT-CONNECTED GENERATOR MODEL FOR THIRD
PARALLEL UNIT-CONNECTED GENERATOR MODEL FOR THIRD

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ADM209 数据手册DataSheet 下载
ADM209 数据手册DataSheet 下载

... The EIA-232-E standard requires transmitters that will deliver ±5 V minimum on the transmission channel and receivers that can accept signal levels down to ±3 V. The ADM206–ADM211/ ADM213 meet these requirements by integrating step-up voltage converters and level shifting transmitters and receivers ...
A 175-mvV multiply-accumulate unit using an adaptive supply
A 175-mvV multiply-accumulate unit using an adaptive supply

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Evaluates: MAX17480 MAX17480 Evaluation Kit General Description Features

... The MAX17480 evaluation kit (EV kit) demonstrates the high-power, triple-output notebook CPU application circuit for the AMD® mobile serial VID interface (SVI) CPU core supplies. This DC-DC converter steps down highvoltage batteries and/or AC adapters, generating precision, low-voltage CPU cores. Th ...
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Online chapter for Alternating Current circuits
Online chapter for Alternating Current circuits

... difference across the capacitor, so these combine to 6.0 volts. The potential difference across the resistor has the opposite polarity, so we subtract that 4.0 volts from the 6.0 volts to get a net potential difference of 2.0 V, with the right end having the higher potential. Key ideas: The three di ...
ICS86004-01
ICS86004-01

... DISCLAIMER Integrated Device Technology, Inc. (IDT) reserves the right to modify the products and/or specifications described herein at any time, without notice, at IDT's sole discretion. Performance specifications and operating parameters of the described products are determined in an independent s ...
ECE 342 – Jose Schutt-Aine
ECE 342 – Jose Schutt-Aine

... In the circuit shown, VT=1 V, l=0, CoxW/2L=0.1 mA/V2. Select RD and R1 to result in midband voltage gain of –4 and VDSQ=7 V. ...
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Appendix F - Testing Results of Electrical Components
Appendix F - Testing Results of Electrical Components

... proper mechanism for opening or closing the valve required the push button be depressed for at least 5s. After completing this action, if open, the valve will close and vice-versa. This 5s delay was included as was part of a safety mechanism to avoid unwanted opening of the valve if the button was h ...
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Frequently Asked Questions About OHP Lamps

... If a large number of new overhead projectors are placed in service at the same time, most of the lamps could fail around the same point in time causing it to seem as though the new overhead projectors are using lamps excessively. After the overhead projectors have been used for some time, the lamp r ...
21 circuits, bioelectricity, and dc instruments
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Institutionen för systemteknik Department of Electrical Engineering Applications
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... low gate leakage currents for non-speed critical circuit parts. The transistors have three threshold voltage options - high, standard and low Vt . The available transistors with their main features are summarized in table 1.1. As the design of the chip is targeted towards low power supply voltages a ...
< 1 ... 507 508 509 510 511 512 513 514 515 ... 2207 >

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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