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VHF Linear using 2x 4cx250b
VHF Linear using 2x 4cx250b

Midas Venice Operators Manual
Midas Venice Operators Manual

... electric shock, do not perform any servicing other than that contained in the Operating Instructions unless you are qualified to do so. Refer all servicing to qualified service personnel. 1. Security regulations as stated in the EN 60065 (VDE 0860) and the CSA E65 - 94 have to be obeyed when servici ...
C-Bus 8 Channel Dimmer, DIN Rail Series
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... tracked and all harmonics and non-harmonics of the fundamental frequency are filtered. This special algorithm ensures that lights do not flicker due to signal injections on the mains from the power authorities. • Programmable thresholds or limits on each dimmer channel, variable from 0 - 100%. For e ...
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MP3422, 6.5A, 600kHz High Efficiency

... The MP3422 can utilize small surface mount chip inductors due to its 600kHz switching frequency. Inductor values between 1μH and 2.2μH are suitable for most applications. Larger values of inductance will allow slightly greater output current capability by reducing the inductor ripple current, but la ...
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... expert team is at your service to assist you in all aspects of the planning stage. After your system is up and running Powerware can offer a range of service plans that can be tailored to meet your needs. ...
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Paper Title (use style: paper title)

... 10 kA/μs with a current rise time of 150 ns. Switching efficiencies more than 2 times higher than Si-based systems have been recorded, indicating that failure mechanisms related to local heating in the resistive drift layer of the device may be less prevalent with SiC compared with Si devices. Solid ...
MAX1800 Digital Camera Step-Up Power Supply General Description
MAX1800 Digital Camera Step-Up Power Supply General Description

... converter, three auxiliary step-up controllers, and an uncommitted gain block that drives an external P-channel MOSFET for a linear regulator. The MAX1800 is targeted for applications that use either two or three primary cells or a single lithium-ion (Li+) battery. The main DC-DC converter accepts i ...
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... QSEE6800+HST module Frame video genlock loop, high­performance passive loop­ ...
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Fuji Electric PXR3 Temperature Controller Brochure

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AC Generators I
AC Generators I

... • Understand the operation of a single phase two pole AC generator. • Describe the operation of a simple AC generator. • Identify and define the components of a three phase two pole AC generator to include rotor, stator, armature. field windings, slip rings and brushes. • Understand the effects of a ...
enter title here (14 pt type size, uppercased, bold and centered over
enter title here (14 pt type size, uppercased, bold and centered over

... Fig. 15 Voltage ripple relationship UINR/UBR depending on input capacitor C and filter voltage level UB. As one can see in Fig. 15 an active filter operating at more than six times the input voltage (approximately 250V in our case) will lead to a satisfactory input current ripple suppression. Higher ...
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... frequencies, they tend to control the level of the entire spectrum. When the lower frequencies are above the limit threshold the higher frequencies are attenuated thus causing the output to sound dull. Multiband processing solves these problems by splitting the audio into two or more frequency bands ...
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... position and switch 2 to the UP position. If running from a receiver, it is necessary to obtain one or more servo pigtails and hook them up according to figure 5.1. If there are only motor drivers being used it is acceptable to power the receiver directly from a SyRen as shown. If the system also ha ...
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... An external fine trim may be desired to set the output level to exactly 5.000 V (calibrated to a main system reference). System calibration may also require a reference voltage that is slightly different from 5.000 V, for example, 5.12 V for binary applications. In either case, the optional trim cir ...
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2. measurement of the windings resistance for universal motors
2. measurement of the windings resistance for universal motors

... Motors that can be used with a single-phase AC source as well as a DC source of supply voltages are called universal motors. Universal motors differ in design from the induction motors. They have a series wound rotor circuitry similar to that of DC motors. The rotor of a universal series motor is ma ...
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Pulse-width modulation



Pulse-width modulation (PWM), or pulse-duration modulation (PDM), is a modulation technique used to encode a message into a pulsing signal. Although this modulation technique can be used to encode information for transmission, its main use is to allow the control of the power supplied to electrical devices, especially to inertial loads such as motors. In addition, PWM is one of the two principal algorithms used in photovoltaic solar battery chargers, the other being MPPT.The average value of voltage (and current) fed to the load is controlled by turning the switch between supply and load on and off at a fast rate. The longer the switch is on compared to the off periods, the higher the total power supplied to the load.The PWM switching frequency has to be much higher than what would affect the load (the device that uses the power), which is to say that the resultant waveform perceived by the load must be as smooth as possible. Typically switching has to be done several times a minute in an electric stove, 120 Hz in a lamp dimmer, from few kilohertz (kHz) to tens of kHz for a motor drive and well into the tens or hundreds of kHz in audio amplifiers and computer power supplies.The term duty cycle describes the proportion of 'on' time to the regular interval or 'period' of time; a low duty cycle corresponds to low power, because the power is off for most of the time. Duty cycle is expressed in percent, 100% being fully on.The main advantage of PWM is that power loss in the switching devices is very low. When a switch is off there is practically no current, and when it is on and power is being transferred to the load, there is almost no voltage drop across the switch. Power loss, being the product of voltage and current, is thus in both cases close to zero. PWM also works well with digital controls, which, because of their on/off nature, can easily set the needed duty cycle.PWM has also been used in certain communication systems where its duty cycle has been used to convey information over a communications channel.
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