General Class Question Pool 2015 - 2019 - DOC
... Which of the following must be true before amateur stations may provide communications to broadcasters for dissemination to the public? A. The communications must directly relate to the immediate safety of human life or protection of property and there must be no other means of communication reasona ...
... Which of the following must be true before amateur stations may provide communications to broadcasters for dissemination to the public? A. The communications must directly relate to the immediate safety of human life or protection of property and there must be no other means of communication reasona ...
General class license
... Union (IARU) has constructed and operates a worldwide network of High Frequency (HF) radio beacons operating at 100 watts on 14.100, 18.110, 21.150 and 28.200 MHz. These beacons help both Amateur Radio and commercial HF radio users to access the current condition of the atmosphere and to determine w ...
... Union (IARU) has constructed and operates a worldwide network of High Frequency (HF) radio beacons operating at 100 watts on 14.100, 18.110, 21.150 and 28.200 MHz. These beacons help both Amateur Radio and commercial HF radio users to access the current condition of the atmosphere and to determine w ...
MZ2421362141
... began to be used as switches in inverter circuits. D. Prince was the person who invention of the earliest inverter device in 1925. He suggests the name\inverter was given to this device for its operating characteristics are the reverse of the rectifiers; instead of AC to DC voltage transformation, D ...
... began to be used as switches in inverter circuits. D. Prince was the person who invention of the earliest inverter device in 1925. He suggests the name\inverter was given to this device for its operating characteristics are the reverse of the rectifiers; instead of AC to DC voltage transformation, D ...
LTC1152 - Rail-to-Rail Input Rail-to-Rail Output
... 4.7MHz divided by 2048) and is synchronized to the internal charge pump to prevent beat frequencies from appearing at the output. The self-nulling circuit constantly corrects the input offset voltage, keeping it typically below ±1µV over the entire input common-mode range. This has the added benefit ...
... 4.7MHz divided by 2048) and is synchronized to the internal charge pump to prevent beat frequencies from appearing at the output. The self-nulling circuit constantly corrects the input offset voltage, keeping it typically below ±1µV over the entire input common-mode range. This has the added benefit ...
EG/PH 305
... (a) Now increase R from 2 K to 10 K in 2 K steps, tabulating at each value the voltage as read by your d'Arsonval voltmeter. (You should record the needle reading in "units" and then convert that reading to the appropriate voltage value.) Then disconnect the d'Arsonval voltmeter from the terminals A ...
... (a) Now increase R from 2 K to 10 K in 2 K steps, tabulating at each value the voltage as read by your d'Arsonval voltmeter. (You should record the needle reading in "units" and then convert that reading to the appropriate voltage value.) Then disconnect the d'Arsonval voltmeter from the terminals A ...
AP65402 - Diodes Incorporated
... The AP65402 is a 4A current mode control, synchronous buck regulator with built in power MOSFETs. Current mode control assures excellent line and load regulation and a wide loop bandwidth for fast response to load transients. The Figure 1 depicts the functional block diagram of AP65402. The operatio ...
... The AP65402 is a 4A current mode control, synchronous buck regulator with built in power MOSFETs. Current mode control assures excellent line and load regulation and a wide loop bandwidth for fast response to load transients. The Figure 1 depicts the functional block diagram of AP65402. The operatio ...
Modelling, analysis and verification of a resonant
... The driving systems of modern high power electromagnetic contactors are usually powered by electronic converters [1]. This is especially true when considering devices that commutate currents above 100A. The application of electronic converters improves upon various properties of the overall system, ...
... The driving systems of modern high power electromagnetic contactors are usually powered by electronic converters [1]. This is especially true when considering devices that commutate currents above 100A. The application of electronic converters improves upon various properties of the overall system, ...
POWER QUALITY DISTURBANCE ON PERFORMANCE OF
... (affecting isolation), overvoltage (reducing expected life time), and under voltage (causing overheating and low speed) . There are several power quality issues which until today were normally not included in motor protection studies. However, they should be taken into consideration due to their inc ...
... (affecting isolation), overvoltage (reducing expected life time), and under voltage (causing overheating and low speed) . There are several power quality issues which until today were normally not included in motor protection studies. However, they should be taken into consideration due to their inc ...
APLYING VARIABLE SPEED DRIVES ON A GENERATOR POWER
... Let’s look at what can be done to improve performance where a high impedance source and / or poor voltage and frequency regulation may cause problems. For large systems where many generators and drives are used, try to spread out and evenly distribute the loads such that drives and other nonlinear l ...
... Let’s look at what can be done to improve performance where a high impedance source and / or poor voltage and frequency regulation may cause problems. For large systems where many generators and drives are used, try to spread out and evenly distribute the loads such that drives and other nonlinear l ...
Single-phase PWM controller with light
... provides complete control logic and protections to realize a general DC-DC step-down converter. Designed to drive N-channel MOSFETs in a synchronous buck topology, with its high level of integration, this 16-pin device allows a reduction of cost and size of the power supply solution and also provide ...
... provides complete control logic and protections to realize a general DC-DC step-down converter. Designed to drive N-channel MOSFETs in a synchronous buck topology, with its high level of integration, this 16-pin device allows a reduction of cost and size of the power supply solution and also provide ...
Ripple: Refers to a low or medium frequency repeating oscillation on
... diode remains conducting for the whole of the rise time trise and the switch continues to see the full supply voltage for the whole of the rise time. On the turn off of the switch – as soon as the switch current starts to fall the diode must begin conducting in order to carry the balance of the indu ...
... diode remains conducting for the whole of the rise time trise and the switch continues to see the full supply voltage for the whole of the rise time. On the turn off of the switch – as soon as the switch current starts to fall the diode must begin conducting in order to carry the balance of the indu ...
Memristive model of amoeba`s learning
... component. The resistance R describes the fact that there must be some signal impedance and dissipation inside the amoeba, or else signals would travel instantaneously and indefinitely. Finally the memristor M summarizes the memory mechanisms we have described above. The temperature and humidity tha ...
... component. The resistance R describes the fact that there must be some signal impedance and dissipation inside the amoeba, or else signals would travel instantaneously and indefinitely. Finally the memristor M summarizes the memory mechanisms we have described above. The temperature and humidity tha ...
PIC-Gen Frequency Generator - Everyday Practical Electronics
... but it has limitations in the maximum frequency that can be generated. The range is typically 0××001Hz to 100kHz. The MAX038, however, is stated to have an upper frequency limit of at least 20MHz, and possibly around 40MHz. It has to be said, though, that attaining such high frequencies requires pri ...
... but it has limitations in the maximum frequency that can be generated. The range is typically 0××001Hz to 100kHz. The MAX038, however, is stated to have an upper frequency limit of at least 20MHz, and possibly around 40MHz. It has to be said, though, that attaining such high frequencies requires pri ...
time domain analysis of induction motor starting transients
... The capacitor size must be determined according to the terminal impedance of the auxiliary winding. Unfortunately, this impedance changes dramatically from the starting to the running condition. Hence, it is not practical to use only one fixed value capacitor for both starting and running. If both t ...
... The capacitor size must be determined according to the terminal impedance of the auxiliary winding. Unfortunately, this impedance changes dramatically from the starting to the running condition. Hence, it is not practical to use only one fixed value capacitor for both starting and running. If both t ...
View Detail
... For RL loads, load current will not be in phase with load voltage and the diodes connected in anti parallel will allow the current to flow when the main thyristors are turned off. These diodes are called feedback diodes. 2. What types of inverters require feedback diodes? VSI with RL load. 3. What i ...
... For RL loads, load current will not be in phase with load voltage and the diodes connected in anti parallel will allow the current to flow when the main thyristors are turned off. These diodes are called feedback diodes. 2. What types of inverters require feedback diodes? VSI with RL load. 3. What i ...
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.""