• Study Resource
  • Explore
    • 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
ECGR 2255 Lab Write-Ups
ECGR 2255 Lab Write-Ups

... When using the pushbutton, record the values of VDS when the LED is on, and when it is off. When using the FG, set it to sine wave, Max. amplitude. Set the frequency to about 5 Hz initially, and then try different blink rates. Observe VDS on the oscilloscope and record what you see. (Set the scope d ...
IOSR Journal of Electrical and Electronics Engineering PP 01-06 www.iosrjournals.org
IOSR Journal of Electrical and Electronics Engineering PP 01-06 www.iosrjournals.org

... received a lot of attention. Some conventional devices are able to mitigate voltage sags in some cases, such as uninterruptible power supplies, ferro-resonant transformers, and motor generator sets. However they have their limitations, and can only be used, economically, at low power ratings. So-cal ...
Power Electronics - Dr. Imtiaz Hussain
Power Electronics - Dr. Imtiaz Hussain

... • Single-phase VSIs cover low-range power applications and three-phase VSIs cover medium- to high-power applications. • The main purpose of these topologies is to provide a three phase voltage source, where the amplitude, phase, and frequency of the voltages should always be controllable. ...
Electrical Motor Starters
Electrical Motor Starters

... therefore be unsuitable for star-delta starting. The starting conditions depend on the position of the tapping on the transformer winding, i.e. on the secondary voltage. Usually three or more tappings are provided so that there is a choice of starting conditions such as 40, 60 or 75% of line voltage ...
Tesla Coil Impedance
Tesla Coil Impedance

... in C1. As time increases, energy is shared among C1, L1 , C2, L2 , and M . The total energy in the circuit decreases with time because of losses in the resistances R1 and R2. There are four energy storage devices so a fourth order differential equation must be solved. The initial conditions are some ...
MAX1682/MAX1683 Switched-Capacitor Voltage Doublers General Description ____________________________Features
MAX1682/MAX1683 Switched-Capacitor Voltage Doublers General Description ____________________________Features

... Devices can be cascaded to produce an even larger voltage (Figure 3). The unloaded output voltage is nominally (n + 1) x VIN, where n is the number of voltage doublers used. This voltage is reduced by the output resistance of the first device multiplied by the quiescent current of the second. The ou ...
VOLTAGE SOURCE INVERTER
VOLTAGE SOURCE INVERTER

AN88 - Ceramic Input Capacitors Can Cause Overvoltage Transients
AN88 - Ceramic Input Capacitors Can Cause Overvoltage Transients

... to use ceramic capacitors to filter DC/DC converter inputs. Ceramic capacitors are often chosen because of their small size, low equivalent series resistance (ESR) and high RMS current capability. Also, recently, designers have been looking to ceramic capacitors due to shortages of tantalum capacito ...
brochure
brochure

... The “Electricity Utilities industry Law” stipulates that for 220V level, the standard voltage supplied by a power supplier shall range within ±26V from 354V to 406V. The supply voltage level will differ depending on its regional areas. In general, when there is a drop in voltage is within an accepte ...
current - Actec A/S
current - Actec A/S

... 2. Ripple & noise are measured at 20MHz of bandwidth by using a 12" twisted pair-wire terminated with a 0.1uf & 47uf parallel capacitor. 3. Tolerance : includes set up tolerance, line regulation and load regulation. 4. The power supply is considered a component which will be installed into a final e ...
MAX3030E–MAX3033E ±15kV ESD-Protected, 3.3V Quad RS-422 Transmitters General Description
MAX3030E–MAX3033E ±15kV ESD-Protected, 3.3V Quad RS-422 Transmitters General Description

Brochure
Brochure

... Increased voltage stability Flexibility to reflect changing site conditions ...
Information contained herein is proprietary information of the
Information contained herein is proprietary information of the

... The signal PT’s monitor the line voltage and feed the three phase bridge whose output delivers the d-c signal proportional to the line voltage to the comparison circuit. This signal, applied to a voltage divider and reference zener diode branch connected in parallel through the reset windings of the ...
EET-222(6)-ELECTRICAL MC-II
EET-222(6)-ELECTRICAL MC-II

... larger internal voltage EA required for lagging loads than for leading loads • Therefore a larger field current required with lagging loads to get same terminal voltage EA=Kφω • Alternatively for a given IF and load current , Vφ is lower for lagging loads & higher for leading loads • In real synchro ...
LNK362-364 rev_E.indd
LNK362-364 rev_E.indd

... used to ensure adequate primary intra-winding capacitance in the range of 25 pF to 50 pF. 3. For designs where 2 < PO ≤ 2.5 W, a bias winding should be added to the transformer using a standard recovery rectifier diode to act as a clamp. This bias winding may also be used to externally power the dev ...
Reactive Power Compensation by Using Microprocessor
Reactive Power Compensation by Using Microprocessor

... Abstract: The main idea of paper is to achieve a flat and better voltage profile i.e. to maintain the constant voltage as equal to the supply voltage at given load. A power system is to be well designed if it gives a good quality of reliable supply. Good quality is meant the voltage levels with in r ...
HMC706LC3C
HMC706LC3C

... to support data transmission rates of up to 13 Gbps, and clock frequencies as high as 13 GHz. During normal operation, RZ data is transferred to the outputs on the positive edge of the clock. Reversing the clock inputs allows for negative-edge triggered applications. All input signals to the HMC706L ...
16) It`s the Law, per Mr Ohm Ω
16) It`s the Law, per Mr Ohm Ω

... It’s the Law, per Mr. Ohm! • T5A10 Go outside your home or condo and gaze at the power meter measuring the rate at which electrical energy is being consumed by all the gadgets inside your new ham shack! Luckily, your modern ham gear won’t consume much energy so your power bill won’t go up by more t ...
UNIT 2 PPT
UNIT 2 PPT

... The series element controls the amount of the input voltage that gets to the output. If the output voltage increases (or decreases), the comparator circuit provides a control signal to cause the series control element to decrease (or increase) the amount of the output voltage. ...
Evaluates:  MAX17112 MAX17112 Evaluation Kit General Description Features
Evaluates: MAX17112 MAX17112 Evaluation Kit General Description Features

2006-04 CARTS-US Capacitor Considerations for Power
2006-04 CARTS-US Capacitor Considerations for Power

paper
paper

Sub-1.0 pF Quad ESD Array
Sub-1.0 pF Quad ESD Array

... NUP4114 Series, SZNUP4114HMR6T1G inductance will provide significant benefits in transient immunity. Even with good board layout, some disadvantages are still present when discrete diodes are used to suppress ESD events across datalines and the supply rail. Discrete diodes with good transient power ...
Experiment FT1
Experiment FT1

... Capacitor, also known as an electrical condenser, is a device that can store electric charge or energy. It can also be used in various types of circuit functions involving: i) Oscillator (alternate charging and discharging of the capacitor); ii) Blocking the flow of direct current; iii) Filter (vary ...
Experiment FT1
Experiment FT1

... Capacitor, also known as an electrical condenser, is a device that can store electric charge or energy. It can also be used in various types of circuit functions involving: i) Oscillator (alternate charging and discharging of the capacitor); ii) Blocking the flow of direct current; iii) Filter (vary ...
< 1 ... 190 191 192 193 194 195 196 197 198 ... 367 >

Spark-gap transmitter



A spark-gap transmitter is a device that generates radio frequency electromagnetic waves using a spark gap.Spark gap transmitters were the first devices to demonstrate practical radio transmission, and were the standard technology for the first three decades of radio (1887–1916). Later, more efficient transmitters were developed based on rotary machines like the high-speed Alexanderson alternators and the static Poulsen Arc generators.Most operators, however, still preferred spark transmitters because of their uncomplicated design and because the carrier stopped when the telegraph key was released, which let the operator ""listen through"" for a reply. With other types of transmitter, the carrier could not be controlled so easily, and they required elaborate measures to modulate the carrier and to prevent transmitter leakage from de-sensitizing the receiver. After WWI, greatly improved transmitters based on vacuum tubes became available, which overcame these problems, and by the late 1920s the only spark transmitters still in regular operation were ""legacy"" installations on naval vessels. Even when vacuum tube based transmitters had been installed, many vessels retained their crude but reliable spark transmitters as an emergency backup. However, by 1940, the technology was no longer used for communication. Use of the spark-gap transmitter led to many radio operators being nicknamed ""Sparks"" long after they ceased using spark transmitters. Even today, the German verb funken, literally, ""to spark,"" also means ""to send a radio message or signal.""
  • studyres.com © 2025
  • DMCA
  • Privacy
  • Terms
  • Report