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File - The Physics Doctor
File - The Physics Doctor

SS320-A - Kenick
SS320-A - Kenick

... is your first line of defense against incoming transient surges attempting to enter a home. It has a low profile design and can be installed on up to Class 320 (320 amp) residential and commercial single phase meter enclosures. ...
M1500-UPS-PFP
M1500-UPS-PFP

L21a_4345_Sp02
L21a_4345_Sp02

... changes in the bias current IEE because of the finite output resistance of the biasing current source.This will cause a change in Ic2 and an identical change in Ic1. Because of the active load ,the change in Ic1 will produce a change in the currents flowing in the pnp load transistors ,which produc ...
Circuit Analysis Slides
Circuit Analysis Slides

... flow, plus & minus signs denote voltage drop ...
ADA4665-2 数据手册DataSheet 下载
ADA4665-2 数据手册DataSheet 下载

... Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. No license is granted by implication or otherwise ...
CN-0030: AD5390/AD5391/AD5392通道监控功能
CN-0030: AD5390/AD5391/AD5392通道监控功能

... The AD7476 ADC is a SAR ADC that offers 12-bit resolution, single 2.35 V to 5.25 V power supply, integrated reference, low power operation, small form factor, and serial interface, with throughput rates up to 1 MSPS in a 6-lead SOT-23 package. The reference for the part is taken internally from VDD ...
Evaluates: MAX16802B MAX16802B Evaluation Kit General Description Features
Evaluates: MAX16802B MAX16802B Evaluation Kit General Description Features

... The MAX16802B EV kit is fully assembled and tested. Follow these steps to verify operation. Do not turn on the power supply until all connections are completed. 1) Connect a DC power supply (0 to 30V or above, 1A) to +VIN and GND. 2) Connect a voltmeter or oscilloscope and the LED array (connected i ...
Electromagnetic Induction
Electromagnetic Induction

AD628 High Common-Mode Voltage Programmable Gain
AD628 High Common-Mode Voltage Programmable Gain

Summary: A brief description of Kirchoff`s Laws (current and voltage)
Summary: A brief description of Kirchoff`s Laws (current and voltage)

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1-1 Overview

...  Separation of charge creates an electric force (voltage)  Motion of charge creates an electric fluid (current) ...
LM2937 - Solarbotics.net
LM2937 - Solarbotics.net

3A, 52kHz, Step-Down Switching Regulator LM2576
3A, 52kHz, Step-Down Switching Regulator LM2576

... All circuits of this series are capable of driving a 3.0A load with excellent line and load regulation. These devices are available in fixed output voltages of 3.3V, 5.0V, 12V and an adjustable output version. These regulators were designed to minimize the number of external components to simplify t ...
Resisting the movement of Charge
Resisting the movement of Charge

... Ohm was the first to publish results of various resistances on types of wires ...
PHY252 Fall 2015 Practical Lab #1:  Ohm’s Law Objectives Apparatus
PHY252 Fall 2015 Practical Lab #1: Ohm’s Law Objectives Apparatus

... 2. Using the banana plug cables, digital multimeters, power supply, resistor and breadboard, construct the circuit shown in Figure 1 below. The V represents the voltmeter, which should be in the DC voltage setting, and the A represents the ammeter, which should be in the DC mA setting. Do not turn t ...
(PGM) Light Dependent Resistors
(PGM) Light Dependent Resistors

... semiconductor layer that is deposited on an insulating substrate. The semiconductor is normally lightly doped to enable it to have the required level of conductivity. Contacts are then placed either side of the exposed area. The photo-resistor, CdS, or LDR finds many uses as a low cost photo sensiti ...
Local Oscillator / Harmonic Mixer Frequency Measurement System
Local Oscillator / Harmonic Mixer Frequency Measurement System

... frequency counter. Realize that this system cannot distinguish whether the microwaves input are below or above 140 Ghz. This can be determined, however, by increasing or decreasing the frequency of the microwaves (using the mechanical bellows on the EIO) and observing the effect this has on the meas ...
High-Voltage goes Vacuum
High-Voltage goes Vacuum

BATTERY GUARD 40 / 60 / 200 OWNERS MANUAL EN
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AD8273 数据手册DataSheet 下载
AD8273 数据手册DataSheet 下载

... by the associated rise in junction temperature (TJ) on the die. At approximately 150°C, which is the glass transition temperature, the plastic changes its properties. Even temporarily exceeding this temperature limit may change the stresses that the package exerts on the die, permanently shifting th ...
EECE 581
EECE 581

... all impedance values given on the primary side. Assume the transformer is rated 16,200/480 V, and 10 kVA. OC Test (done on secondary side): Voc = 480 V, Ioc = 0.5 A, Poc = 200 W SC Test (done on primary side): Vsc = 1000 V, Isc = 15 A, Psc = 2000 W ...
common-base amplifier
common-base amplifier

... Utilize your knowledge of transistor amplifiers and troubleshooting techniques and imagine what the effects would be with various faulty components—for example, open resistors, shorted transistor junctions or capacitors. More importantly, how would the output be affected by these faults? In troubles ...
The desired DC voltage increase from 420 to 600 V is shown in
The desired DC voltage increase from 420 to 600 V is shown in

... 1. The voltage oscillations under ferroresonance on a cable-fed transformer can represent a severe power quality issue which can produce damage to LV DC motors if this condition is not properly detected and action taken to disconnect the DC drive from the power supply. Similar voltage fluctuations o ...
voltage reduction schemes
voltage reduction schemes

... Voltage Schedule. Various specific schemes are in practice due to the variety and vintages of Voltage Regulating Relays in service. The Beckwith Electric tapchanger voltage regulating relays all come with on board capability to receive the dry contact closure to implement the customer’s desired volt ...
< 1 ... 1831 1832 1833 1834 1835 1836 1837 1838 1839 ... 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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