TS431 2.495V Programmable Shunt Voltage Reference
... cathode current up to 3mA (typ). The device is less stable the lower the cathode voltage has been set for. Therefore while the device will be perfectly stable operating at a cathode current of 10mA (approx.) with a 0.1uF capacitor across it, it will oscillate transiently during start up as the catho ...
... cathode current up to 3mA (typ). The device is less stable the lower the cathode voltage has been set for. Therefore while the device will be perfectly stable operating at a cathode current of 10mA (approx.) with a 0.1uF capacitor across it, it will oscillate transiently during start up as the catho ...
Physics 19 – Photoelectric Effect
... between the two electrodes. Light shines on one electrode which emits electrons - this electrode is called the cathode. The current due to the emitted electrons is measured by the galvanometer. The purpose of the variable resistor and power supply is to measure the energy of the electrons emitted fr ...
... between the two electrodes. Light shines on one electrode which emits electrons - this electrode is called the cathode. The current due to the emitted electrons is measured by the galvanometer. The purpose of the variable resistor and power supply is to measure the energy of the electrons emitted fr ...
Organic Light Emitting Diodes
... A light-emitting diode (LED) is a twolead semiconductor light source. It is a p–n junction diode, which emits light when activated. When a suitable voltage is applied to the leads, electrons are able to recombine with electron holes within the device, releasing energy in the form of photons. ...
... A light-emitting diode (LED) is a twolead semiconductor light source. It is a p–n junction diode, which emits light when activated. When a suitable voltage is applied to the leads, electrons are able to recombine with electron holes within the device, releasing energy in the form of photons. ...
Introduction and Semiconductor Technology
... As the distance between atoms decreases the discrete subshells spread out into bands As the distance decreases further, the bands overlap and then separate ...
... As the distance between atoms decreases the discrete subshells spread out into bands As the distance decreases further, the bands overlap and then separate ...
Phet magnets lab
... Most power transformers are designed to operate at either 50 or 60 Hz. Power transformers with a 400 Hz rating are often used in aircraft because these transformers are much smaller and lighter than 50 or 60 Hz transformers. ...
... Most power transformers are designed to operate at either 50 or 60 Hz. Power transformers with a 400 Hz rating are often used in aircraft because these transformers are much smaller and lighter than 50 or 60 Hz transformers. ...
Cavity magnetron
The cavity magnetron is a high-powered vacuum tube that generates microwaves using the interaction of a stream of electrons with a magnetic field while moving past a series of open metal cavities (cavity resonators). Bunches of electrons passing by the openings to the cavities excite radio wave oscillations in the cavity, much as a guitar's strings excite sound in its sound box. The frequency of the microwaves produced, the resonant frequency, is determined by the cavities' physical dimensions. Unlike other microwave tubes, such as the klystron and traveling-wave tube (TWT), the magnetron cannot function as an amplifier, increasing the power of an applied microwave signal, it serves solely as an oscillator, generating a microwave signal from direct current power supplied to the tube.The first form of magnetron tube, the split-anode magnetron, was invented by Albert Hull in 1920, but it wasn't capable of high frequencies and was little used. Similar devices were experimented with by many teams through the 1920s and 30s. On November 27, 1935, Hans Erich Hollmann applied for a patent for the first multiple cavities magnetron, which he received on July 12, 1938, but the more stable klystron was preferred for most German radars during World War II. The cavity magnetron tube was later improved by John Randall and Harry Boot in 1940 at the University of Birmingham, England. The high power of pulses from their device made centimeter-band radar practical for the Allies of World War II, with shorter wavelength radars allowing detection of smaller objects from smaller antennas. The compact cavity magnetron tube drastically reduced the size of radar sets so that they could be installed in anti-submarine aircraft and escort ships.In the post-war era the magnetron became less widely used in the radar role. This was because the magnetron's output changes from pulse to pulse, both in frequency and phase. This makes the signal unsuitable for pulse-to-pulse comparisons, which is widely used for detecting and removing ""clutter"" from the radar display. The magnetron remains in use in some radars, but has become much more common as a low-cost microwave source for microwave ovens. In this form, approximately one billion magnetrons are in use today.