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lab8
lab8

... b. Now go back to normal mode on the scope, and plot the input, Vout, Vout2, and VB1 vs. time. i. Make sure that you have a 10nF capacitor on the output. ii. Apply a very small amplitude sine wave to the input, with a DC bias equal to what you recorded from the previous part. Make sure that the DC o ...
DMT 231 / 3 Lecture V Frequency Response of BJT
DMT 231 / 3 Lecture V Frequency Response of BJT

... • Also known as cutoff frequency OR corner frequency Frequency at which the output drops to one-half of its midrange value. Corresponds to a 3 dB reduction in the power gain: Ap(dB) = 10 log (0.5) = - 3 dB Power Measurement in dBm • dBm : unit for measuring power levels referenced to 1 mW ...
a multilevel energy buffer and voltage modulator for
a multilevel energy buffer and voltage modulator for

SP6887 4 CHANNEL REGULATED CHARGE PUMP WLED DRIVER
SP6887 4 CHANNEL REGULATED CHARGE PUMP WLED DRIVER

... The SP6887 is a 4-channel charge pump white LED driver, capable of driving up to 4 LEDs connected in parallel. The device operates in either 1x mode or 1.5x fractional mode, and it can switch from 1x mode to 1.5x mode automatically when the input voltage decreases. Its internal 4 current sink regula ...
Review with answers
Review with answers

... ____ 13. As the distance between two positively charged objects increases, the force between them: a. increases. c. cannot be determined. b. decreases. d. remains the same. ____ 14. The electric force between a 5-coulomb charge and a 1-coulomb charge 9,000 meters apart is: a. 5,000,000 newtons. b. 6 ...
Document
Document

4× JFET Buffer Amplifier Cuts Noise in Half
4× JFET Buffer Amplifier Cuts Noise in Half

... In the circuit of Figure 1, each channel has extremely low current noise (0.8 fA/√Hz) in comparison with voltage noise of (13 nV/√Hz). Therefore, when one needs less added noise in the system, it is critical to reduce this voltage noise. The voltage noise can be reduced by placing multiple buffers i ...
AC Series Notes
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...  e(t )  VRMS 2 sin(2 ft   ) ...
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Z104 1 2 3 4 6 * ) mA 6 1 * ) V 6 1 ) * mA Vext * ) 9 7 12 * 10 )

... supply of the sensor with 2-wire method: 20VDC stabilized, max. 20mA protected against short-circuiting. input in voltage 0 5 Vdc, 1 5 Vdc, 0 10 Vdc and 2 10 Vdc; integration constant, programmable in the range 1 pulse every 2 hours to 10 KHz; straightforward setting, can be performed using a digita ...
ExamView - POE Practice Test
ExamView - POE Practice Test

... 12. Two lamps are wired in parallel. If another ...
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12.6 Electrical Circuits

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DM74LS30 8-Input NAND Gate
DM74LS30 8-Input NAND Gate

... DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR CORPORATION. As used herein: 2. A critical component in any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support de ...
The Air Flow Transducer
The Air Flow Transducer

... unheated. Our transducer works with heat changing. When we flow the air on this two RTD the heated one will more change their temperature from the another one. The temperature changing depends on air flow force and speed, but our circuit has only one step adjustment air flow pump. The air flow trans ...
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... “My Gamry Data” folder on the desktop. You can change this from the “Default” button. b. Set your electroplating currents: This program allows you to set two different currents. If you just want to use one current throughout the whole process, you can leave the value the same in both Step 1 Current ...
Electric Circuits
Electric Circuits

... Current has but a single pathway through the circuit. This current is resisted by the resistance of the first device, the resistance of the second device, etc……. Total resistance to the current is the sum of the individual resistances along the path. ...
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A Wide-Range Oscillator For Audio And Supersonsonic Frequencies

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... Turn off the power. If this is not possible, do not touch the person directly. Perhaps use an insulator such as a plastic rope or garden hose to move them away from the source of electrocution. Then give first aid. Phone 000. 16 What is the emergency phone number from: a a landline phone b a mobile ...
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Applications of Semiconductor devices – Switches.

Electricity
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... current Loads are set up in a series, or line. A failure or break in any part of the circuit results in the stopping of the flow of electricity thru the entire circuit. All loads share the same energy source.  Current ...
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Current, Resistance and Power

... Independent of Electric Field: Ohmic But can depend on conditions which effect , such as temperature ...
Dual AC/DC Input Module/AutoMate/AutoMax/DCS
Dual AC/DC Input Module/AutoMate/AutoMax/DCS

Electric Currents
Electric Currents

... the rate at which work is done: P = W/t = q  V/t = I  V where we have used the definition of current I as the rate of flow of charge. We write more simply P = IV where power is in watts (W), current I is an amperes or amps (A) and voltage V is in volts (V). This relation can be written in other wa ...
Development of a Picosecond-resolution TDC for
Development of a Picosecond-resolution TDC for

< 1 ... 1923 1924 1925 1926 1927 1928 1929 1930 1931 ... 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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