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test results
test results

... Multi level testing has been performed in developing this unit. The printed circuit board has been tested thoroughly for track short, track open or any cracks. The input Op Amp and the feedback Op Amp has been tested for a long time using offset adjustments with current input fed before final optimi ...
Current - 7th and 8th Grade Science
Current - 7th and 8th Grade Science

... 2. 4.0A of current flow through a circuit with 30.0 of resistance. What is the voltage of the power source? 3. A battery provides 1.5V of potential to a circuit with a motor. If the circuit draws 0.55A of current, what resistance does the motor provide? ...
Assignment-2 File - Shankersinh Vaghela Bapu Institute of Technology
Assignment-2 File - Shankersinh Vaghela Bapu Institute of Technology

Unit 8: Electronic Circuit Design and Construction
Unit 8: Electronic Circuit Design and Construction

... Draw and label a diagram of the 1N4001 general purpose diode connected in forward bias and reverse bias mode Measure the forward characteristic of the diode between 0.5 volts and 0.7 volts using steps of 0.01 of a volt by adjusting the resistance box R1 Measure and record the reverse characteristic ...
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... What is an electric current? (definition) What is a battery? (definition) What is an electric circuit? (definition) What is current measured in? ________ What is resistance measured in? ________ What is power measured in? __________ What is the potential difference measured in? ________ 5. What is a ...
characteristics of passive circuit elements (r,l,c)
characteristics of passive circuit elements (r,l,c)

... voltage drop across the device should be measured to obtain its V-I characteristics, here what is measured is the voltage drop across the series combination of the device and the current measuring resistance RM. For this voltage to be a good approximation to the voltage drop across the device, the v ...
NATG 1100 DC Circuit Fundamentals - Description
NATG 1100 DC Circuit Fundamentals - Description

... 1. Define the conductive and physical properties of common metal conductors. 2. Identify electrical quantities and associated symbols. 3. Define scientific, engineering, and exponential notation. Demonstrate addition, subtraction, multiplication, and division of exponential numbers. 4. Describe the ...
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EET 104 Quiz #1 January 31, 2005

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Index: SHARP Electronic Components

... Care must be taken not to touch the light detector surface. If it should be dirty, wipe off such dust and refuse with soft cloth so as to prevent scratch. In case some solvents are required, use methyl alcohol, ethyl alcohol or isopropyl alcohol only. Also, protect the light detecting unit against f ...
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AIM3-Analog Isolation Re-scaling Module for Variable
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33 - NSRRC User Portal

... give the maximum output signal at the anode or after a linear amplifier. Some PMT bases have a third connector called DYNODE which is the output signal from the last dynode with positive polarity. If we do not use this output, the output should be terminate by a 100 ohms terminator. The Single Chann ...
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... All of the Hi-Z Array systems use voltage over coax to supply operating power for their Hi-Z amps. The power is injected into the Antenna connectors on the controllers using normal inductors suitable for the purpose. It is certainly possible to damage these internal inductors if an intentional or un ...
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FJV3 104R NPN Epitaxial Silicon Transistor

... support device or system, or to affect its safety or failure to perform when properly used in accordance with instructions for use provided in the labeling, can be effectiveness. reasonably expected to result in significant injury to the user. PRODUCT STATUS DEFINITIONS Definition of Terms Datasheet ...
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... When the switch in the circuit with the low voltage supply is closed, the current through the coil of wire creates a magnetic field. This closes the switch contact in the second circuit, completing the second circuit and allowing the motor to operate. Crocodile Physics [relay model] ...
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Deney1

... The aim of this experiment is to gain some experience in the use of the digital oscilloscope, DMM and function generators. Try to become comfortable using the oscilloscope DMM and Function generators as it will be used often in this lab, and they are an important instruments in electronics diagnosti ...
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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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