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Tiny Crystal Oscillator
Tiny Crystal Oscillator

Goal: To understand what Electric Fields are
Goal: To understand what Electric Fields are

ELCT Class performance (Quizzes 1&2 and Midterm)
ELCT Class performance (Quizzes 1&2 and Midterm)

... provide out of phase input voltages. ...
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The Transistor

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... LT1795 but do not need the full bandwidth and slew performance. Details of this control can be found on the LT1795 data sheet. If the Shutdown input is grounded, both amplifiers are disabled and the total quiescent current drain for the package is reduced to only 200µA. This feature can be used to s ...
Mini Tutorial MT-212
Mini Tutorial MT-212

... The polarity of the output can be change to a negative going by reversing both of the diodes. Error terms are the same as for the inverting amplifier (see MT-213). Most significant is the offset term. The frequency response of the circuit is set primarily by the open-loop gain of the op amp. The shu ...
forward-biased
forward-biased

... • Feature common to both transistors and tubes is that they can amplify signals. • A triode vacuum tube might be used because instead of a transistor because it may be able to handle higher power. • Can amplify a small signal but must use high voltages (transistor doesn’t need high voltages) • Parts ...
PHYS 1402 General Physics II EXPERIMENT 7C AC CIRCUITS I
PHYS 1402 General Physics II EXPERIMENT 7C AC CIRCUITS I

... The objective of this experiment is to study the behavior of an RC series circuit subjected to an AC input. This will be done by measuring the circuit current and the voltages across the various circuits elements. Also the phase angle between the current and the power supply voltage will be measured ...
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Chapter 1. Introduction

...  The Bessel function falls off rapidly for ...
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No Slide Title

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RC and RL Circuits_NR

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Lecture 11

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What Is Digital?

... each output for every possible combination of valid input values a timing specification on the required time for the device to compute the specified output values from an arbitrary set of stable, valid input values ...
photoelectric effect
photoelectric effect

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Electric Current - Okemos Public Schools

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Electrical Current – The Flow of Charge

... The cells provide the energy for the charges/voltage to flow around the circuit. If we add more cells this increases/decreases the charge/voltage. Because the charges have less/ more energy the rate of flow increases/decreases, so the ammeter reads a smaller/larger number of Amps. The number of Amps ...
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2008. Lecture 11 (361-1

... resistance of the amplifier should be much lower than the series resistance of the inductor to not to reduce the quality factor of the resonant circuit. A CC amplifier has the lowest output resistance, about 26  at IE=1 mA. However, compared to a lower than 1  series resistance of the inductor, it ...
INSTALL NOTES:QZ
INSTALL NOTES:QZ

... The LEDs in this product function ideally when the incoming voltage is between 10–15 volts. Voltages outside of this range may damage the LEDs, shorten their life, and cause unsatisfactory performance. The use of improper voltage voids the product warranty. Only use a UL 1838 approved power supply. ...
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Electric charges in motion Voltage sources Electrical circuits

- Solar panel,solar panel for home,solar energy panels
- Solar panel,solar panel for home,solar energy panels

... pure charger mode: This mode will turn off the load output, but the logic of charging is still valid; if the load is directly connected to the battery, it can still receive power output. Note: connecting the load directly to the battery does not have over-discharge protection and overload, short cir ...
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HL225-6 - Fullriver

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... Since power electronics is a rapidly growing subject the course tries to reflect this by covering the well established and widely used technologies (such as three phase rectification) as well as more recent developments such as resonant converters. The increasing importance of power quality is also ...
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Basic Electronics Electrical Power Background: Equipment: 1

... Power is defined as the rate at which energy is used, transferred, or transformed. Power is energy (Joule) divided by time and its unit is the Watt (J/s). Electrical power is the rate at which electrical energy is used. The electrical power used or dissipated by a resistor connected to an energy sou ...
PL519 FRINEAR 150, 150 W HF Amplifier
PL519 FRINEAR 150, 150 W HF Amplifier

< 1 ... 1898 1899 1900 1901 1902 1903 1904 1905 1906 ... 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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