• Study Resource
  • Explore Categories
    • Arts & Humanities
    • Business
    • Engineering & Technology
    • Foreign Language
    • History
    • Math
    • Science
    • Social Science

    Top subcategories

    • Advanced Math
    • Algebra
    • Basic Math
    • Calculus
    • Geometry
    • Linear Algebra
    • Pre-Algebra
    • Pre-Calculus
    • Statistics And Probability
    • Trigonometry
    • other →

    Top subcategories

    • Astronomy
    • Astrophysics
    • Biology
    • Chemistry
    • Earth Science
    • Environmental Science
    • Health Science
    • Physics
    • other →

    Top subcategories

    • Anthropology
    • Law
    • Political Science
    • Psychology
    • Sociology
    • other →

    Top subcategories

    • Accounting
    • Economics
    • Finance
    • Management
    • other →

    Top subcategories

    • Aerospace Engineering
    • Bioengineering
    • Chemical Engineering
    • Civil Engineering
    • Computer Science
    • Electrical Engineering
    • Industrial Engineering
    • Mechanical Engineering
    • Web Design
    • other →

    Top subcategories

    • Architecture
    • Communications
    • English
    • Gender Studies
    • Music
    • Performing Arts
    • Philosophy
    • Religious Studies
    • Writing
    • other →

    Top subcategories

    • Ancient History
    • European History
    • US History
    • World History
    • other →

    Top subcategories

    • Croatian
    • Czech
    • Finnish
    • Greek
    • Hindi
    • Japanese
    • Korean
    • Persian
    • Swedish
    • Turkish
    • other →
 
Profile Documents Logout
Upload
Comparing Topologies and the (Design) Rules
Comparing Topologies and the (Design) Rules

... They fall into two basic categories. The Boost and Buck-Boost are similar in the sense that during the switch ON-time, energy from the input builds up in the inductor, with none passing to the output. When the switch turns off, the diode conducts, releasing the stored energy into the output sections ...
WIRELESS COMMUNICATION By: Team Team
WIRELESS COMMUNICATION By: Team Team

... Construct a circuit for interfacing with the XBee module Learn how to interface with a voltage translator Construct code for doing a check sum with a string Construct code for transmitting data to the XBee module ...
LM1575/LM2575/LM2575HV SIMPLE SWITCHER® 1A Step
LM1575/LM2575/LM2575HV SIMPLE SWITCHER® 1A Step

... Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is intended to be functional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see the Electric ...
MAX6979 16-Port, 5.5V Constant-Current LED Driver with LED Fault Detection and Watchdog
MAX6979 16-Port, 5.5V Constant-Current LED Driver with LED Fault Detection and Watchdog

... 16-Port, 5.5V Constant-Current LED Driver with LED Fault Detection and Watchdog The MAX6979 serial-interfaced LED driver provides 16 open-drain, constant-current-sinking LED driver outputs rated at 5.5V. The MAX6979 operates from a 3V to 5.5V supply. The MAX6979 supply and the LEDs’ supply can power ...
Capacitors for pulse applications B43415, B43416
Capacitors for pulse applications B43415, B43416

4 RC Circuits Experiment 4.1
4 RC Circuits Experiment 4.1

... Initially, a capacitor is in series with a resistor and disconnected from a battery so it is uncharged. If a switch is added to the circuit but is open, no current flows. Then, the switch is closed as in Fig. 4.2(a). Now the capacitor will charge up and its voltage will increase. During this time, a ...
Fault find general principles
Fault find general principles

... • All healthy component’s circuit have a value of resistance. • Placing an ohmmeter across the component should indicate the components condition. – Values of 0 are considered as short circuited. – Values of infinite ohms are considered as open circuited. ...
UCC38500 PFC/PWM Combination Controller
UCC38500 PFC/PWM Combination Controller

Terms and Abbreviations
Terms and Abbreviations

Drive circuit basics
Drive circuit basics

... winding demands that a current path always exists. When using transistors as switches, diodes have to be added to enable current flow in both directions across the switch. For the bipolar driver four diodes, one for each switch, provide current paths according to figure 8. Note that there are two wa ...
BD1484EFJ
BD1484EFJ

... Choosing compensation capacitor CCMP and resistor RCMP The current-mode buck converter has 2-poles and 1-zero system. Choosing the compensation resistor and capacitor is important for a good load-transient response and good stability. The example of DC/DC converter application bode plot is shown bel ...
NCP1271ADAPGEVB 19 V, 3.0 A Universal Input AC-DC Adaptor Using NCP1271 Evaluation Board
NCP1271ADAPGEVB 19 V, 3.0 A Universal Input AC-DC Adaptor Using NCP1271 Evaluation Board

... bunch of skip pulses. To address this need, the NCP1271 has a proprietary Soft−Skip feature which ramps each bunch of pulses. This dramatically lowers acoustic noise and allows a higher skip level to be set for greater power savings. The NCP1271 also allows the designer to select the optimal level o ...
BSPM1275TN(R) / BSPM1320TN(R) / BSPM1385TN(R) / BS
BSPM1275TN(R) / BSPM1320TN(R) / BSPM1385TN(R) / BS

... The only controlled copy of this Data Sheet is the electronic read-only version located on the Cooper Bussmann Network Drive. All other copies of this document are by definition uncontrolled. This bulletin is intended to clearly present comprehensive product data and provide technical information th ...
mt-075 tutorial
mt-075 tutorial

MAX5160/MAX5161 Low-Power Digital Potentiometers
MAX5160/MAX5161 Low-Power Digital Potentiometers

High-Impedance Neutrals
High-Impedance Neutrals

... example, this type of fault can be identified by a process of elimination or with basic visual inspection; however, electrical characteristics of the suspected fault would likely not provide meaningful insight to the original electrical state of the system before the fire. If the fire damage is subs ...
RTD/resistance input two-wire/three
RTD/resistance input two-wire/three

... 100 ohm Pt RTD or 0-900 ohm input ◆ 4-20mA output (sink/source) ◆ 12-32V DC loop/local power Advanced signal processing capabilities, variable range input, and convenient USB programming make this instrument a very versatile temperature measurement device. These transmitters can withstand harsh indu ...
Resistance Why does a copper wire have less resistance than an
Resistance Why does a copper wire have less resistance than an

Abstract Changes with time in the partial discharge(PD)
Abstract Changes with time in the partial discharge(PD)

... 400-ns wide input pulse. When a narrower pulse, or the spark-gap source is employed, the ringing immediately oscillates about zero (similar to Figure 6). For a 100-V input pulse, the slip-ring signal results in an output at the coupler about 50% greater than for simulated PD Figure 4: Relative respo ...
- Kamaljeeth Instrument
- Kamaljeeth Instrument

... various universal constants in lab experiments. It provides a means to experimentally determine various physical constants in Physics. One such experiment is the determination of ratio of e/k using the transistor equation, as described below. ...
AN-146 FM Remote Speaker System
AN-146 FM Remote Speaker System

... Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should obtain the latest relevant ...
Paper Title (use style: paper title)
Paper Title (use style: paper title)

... help of these devices we are capable to reduce the problems related to power quality [2] & [3]. Although all devices can improve the power quality but in this the focus is on UPQC. UPQC is a power electronic device consisting of both DVR and D-STATCOM, former is connected in series and latter is con ...
LTC1451-3, LinTech, 12-DAC serial, 3 or 5V, SO8.pdf
LTC1451-3, LinTech, 12-DAC serial, 3 or 5V, SO8.pdf

COLOR TELEVISION TRAINING MANUAL Chassis Series  VB8B
COLOR TELEVISION TRAINING MANUAL Chassis Series VB8B

LT6301 - Dual 500mA, Differential xDSL Line Driver in 28-Lead TSSOP Package
LT6301 - Dual 500mA, Differential xDSL Line Driver in 28-Lead TSSOP Package

... components in the system. The large peak to RMS variations of DMT and CAP ADSL signals require high supply voltages to prevent clipping, and the use of a step-up transformer to couple the signal to the telephone line can require high peak current levels. These requirements result in the driver packa ...
< 1 ... 1030 1031 1032 1033 1034 1035 1036 1037 1038 ... 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.
  • studyres.com © 2026
  • DMCA
  • Privacy
  • Terms
  • Report