Practical exercises for learning to construct NMR/MRI probe circuits
... The student should build some single layer solenoidal coils and resonate them with suitable ceramic or mica capacitors. A good place to start is 5 or 6 turns of stiff wire (18 wire gauge), with the coil about 2.5 cm in diameter and a 47 pF capacitor; this circuit will resonate near 30 MHz. The reflec ...
... The student should build some single layer solenoidal coils and resonate them with suitable ceramic or mica capacitors. A good place to start is 5 or 6 turns of stiff wire (18 wire gauge), with the coil about 2.5 cm in diameter and a 47 pF capacitor; this circuit will resonate near 30 MHz. The reflec ...
Lecture 11 - UniMAP Portal
... maxima and minima, the derivative will exist and will have values from the minimum to the maximum inclusive. The derivative of a sine wave is a cosine wave; it has the same period and frequency as the original sinusoidal waveform. ...
... maxima and minima, the derivative will exist and will have values from the minimum to the maximum inclusive. The derivative of a sine wave is a cosine wave; it has the same period and frequency as the original sinusoidal waveform. ...
MAX868 Regulated, Adjustable -2x Inverting Charge Pump General Description
... Choosing the Output Capacitor The output capacitor stores the charge transferred from the flying capacitors and services the load between oscillator cycles. A good general rule is to make the output capacitance at least ten times greater than that of the flying capacitors. The output voltage ripple ...
... Choosing the Output Capacitor The output capacitor stores the charge transferred from the flying capacitors and services the load between oscillator cycles. A good general rule is to make the output capacitance at least ten times greater than that of the flying capacitors. The output voltage ripple ...
TIG Series OPERATOR MANUAL wilkinsonstar.com DC MMA / TIG Welding machines
... Consult the data plate on the equipment for the power supply requirements. Due to the elevated absorbance of the primary current from the power supply network, high power systems affect the quality of power provided by the network. Consequently, connection restrictions or maximum impedance requiremen ...
... Consult the data plate on the equipment for the power supply requirements. Due to the elevated absorbance of the primary current from the power supply network, high power systems affect the quality of power provided by the network. Consequently, connection restrictions or maximum impedance requiremen ...
Voltage Transformers
... will eventually be damaged to such an extent that it may no longer protect the equipment. Even when properly adjusted, the protective gap might arc over during transient overvoltages caused by switching or by lightning. The duration of such arc-over is so short that it will not interfere with the pr ...
... will eventually be damaged to such an extent that it may no longer protect the equipment. Even when properly adjusted, the protective gap might arc over during transient overvoltages caused by switching or by lightning. The duration of such arc-over is so short that it will not interfere with the pr ...
ZXLB1600 LCD and OLED bias boost converter
... When 'EN' is high, the control circuits become active. The high side of the coil is connected to the input via a large PMOS isolating switch (MP) and the low side to ground via NDMOS transistor (MN). The current in the coil is allowed to build up to an internally defined level (nominally 200 to 300m ...
... When 'EN' is high, the control circuits become active. The high side of the coil is connected to the input via a large PMOS isolating switch (MP) and the low side to ground via NDMOS transistor (MN). The current in the coil is allowed to build up to an internally defined level (nominally 200 to 300m ...
technically speaking
... burners have ignited. If no flame is present after a certain amount of time, the controller will shut off the gas to the burners. Here’s how it works: The controller applies an AC voltage between the flame sensing rod and the base of the flame (ground). On Ruud furnaces this voltage is typically gre ...
... burners have ignited. If no flame is present after a certain amount of time, the controller will shut off the gas to the burners. Here’s how it works: The controller applies an AC voltage between the flame sensing rod and the base of the flame (ground). On Ruud furnaces this voltage is typically gre ...
TPS6205x 800-mA Synchronous Step
... The TPS6205x family of devices are synchronous step-down converters that operate with a 850-kHz fixedfrequency pulse width modulation (PWM) at moderate to heavy load currents and enters the power save mode at light load current. During PWM operation, the converter uses a unique fast response voltage ...
... The TPS6205x family of devices are synchronous step-down converters that operate with a 850-kHz fixedfrequency pulse width modulation (PWM) at moderate to heavy load currents and enters the power save mode at light load current. During PWM operation, the converter uses a unique fast response voltage ...
Research Article A Binary Weighted 7
... however the smoothness and performance quality are depends on the number of taps of transformer in this solution the steps of voltage controlling equal to the number of taps of transformer, that means, the AC voltage connection is for 220 volt levels through controlling function as well as only one ...
... however the smoothness and performance quality are depends on the number of taps of transformer in this solution the steps of voltage controlling equal to the number of taps of transformer, that means, the AC voltage connection is for 220 volt levels through controlling function as well as only one ...
Driving apparatus and method of three phase induction motor
... Operation poWer is supplied to the ?rst photocoupler IS01 and to the transistors Q3 and Q4 through Vcc2. An emitter of the second NPN transistor Q3 and an emitter of the ?rst PNP transistor Q4 are connected in series to each other. When the photocoupler IS01 is in an ON state, the ?rst PNP transisto ...
... Operation poWer is supplied to the ?rst photocoupler IS01 and to the transistors Q3 and Q4 through Vcc2. An emitter of the second NPN transistor Q3 and an emitter of the ?rst PNP transistor Q4 are connected in series to each other. When the photocoupler IS01 is in an ON state, the ?rst PNP transisto ...
capacitor voltage transformer
... times rated primary voltage, rated frequency and rated burden corresponding to the highest rated output at any power factor between 0.8 and unity, over an ambient temperature of 50ºC shall not exceed the limits as specified in IEC standards. The temperature rise at 1.5 times rated primary voltage wh ...
... times rated primary voltage, rated frequency and rated burden corresponding to the highest rated output at any power factor between 0.8 and unity, over an ambient temperature of 50ºC shall not exceed the limits as specified in IEC standards. The temperature rise at 1.5 times rated primary voltage wh ...
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.""