Schottky Diode Working and Applications
... Schottky Diode Working and Applications V-I Characteristics Of Schottky Barrier Diode The forward voltage drop of the Schottky barrier diode is very low compared to a normal PN junction diode. The forward voltage drop ranges from 0.3 volts to 0.5 volts. The forward voltage drop of Schottky ba ...
... Schottky Diode Working and Applications V-I Characteristics Of Schottky Barrier Diode The forward voltage drop of the Schottky barrier diode is very low compared to a normal PN junction diode. The forward voltage drop ranges from 0.3 volts to 0.5 volts. The forward voltage drop of Schottky ba ...
Charging A Capacitor
... When power is applied, the capacitor charges to the firing voltage of the NE-2 and produces part of the sawtooth waveform. When the NE-2 fires, the capacitor discharges through the NE-2, the source sends current through the NE-2 and the resistor, and the rest of the sawtooth waveform is produced. Th ...
... When power is applied, the capacitor charges to the firing voltage of the NE-2 and produces part of the sawtooth waveform. When the NE-2 fires, the capacitor discharges through the NE-2, the source sends current through the NE-2 and the resistor, and the rest of the sawtooth waveform is produced. Th ...
Lecture 9: EM Transmission Lines and Smith Chart
... case (ones considered in the circuit theory) – these solutions will be in form of traveling waves of voltage and current, propagating in either direction on the transmission line with the velocity specified by (9.13.3). We assume here that the transmission line is connected to a distant generator th ...
... case (ones considered in the circuit theory) – these solutions will be in form of traveling waves of voltage and current, propagating in either direction on the transmission line with the velocity specified by (9.13.3). We assume here that the transmission line is connected to a distant generator th ...
Electronic Snap Circuits Manual
... The adjustable resistor (RV) is a 50KΩ resistor but with a center tap that can be adjusted between 0Ω and 50KΩ. At the 0Ω setting, the current must be limited by the other components in the circuit. The microphone (X1) is actually a resistor that changes in value when changes in air pressure (sounds ...
... The adjustable resistor (RV) is a 50KΩ resistor but with a center tap that can be adjusted between 0Ω and 50KΩ. At the 0Ω setting, the current must be limited by the other components in the circuit. The microphone (X1) is actually a resistor that changes in value when changes in air pressure (sounds ...
Crystal radio
A crystal radio receiver, also called a crystal set or cat's whisker receiver, is a very simple radio receiver, popular in the early days of radio. It needs no other power source but that received solely from the power of radio waves received by a wire antenna. It gets its name from its most important component, known as a crystal detector, originally made from a piece of crystalline mineral such as galena. This component is now called a diode.Crystal radios are the simplest type of radio receiver and can be made with a few inexpensive parts, such as a wire for an antenna, a coil of copper wire for adjustment, a capacitor, a crystal detector, and earphones. They are distinct from ordinary radios as they are passive receivers, while other radios use a separate source of electric power such as a battery or the mains power to amplify the weak radio signal so as to make it louder. Thus, crystal sets produce rather weak sound and must be listened to with sensitive earphones, and can only receive stations within a limited range.The rectifying property of crystals was discovered in 1874 by Karl Ferdinand Braun, and crystal detectors were developed and applied to radio receivers in 1904 by Jagadish Chandra Bose, G. W. Pickard and others.Crystal radios were the first widely used type of radio receiver, and the main type used during the wireless telegraphy era. Sold and homemade by the millions, the inexpensive and reliable crystal radio was a major driving force in the introduction of radio to the public, contributing to the development of radio as an entertainment medium around 1920.After about 1920, crystal sets were superseded by the first amplifying receivers, which used vacuum tubes (Audions), and became obsolete for commercial use. They, however, continued to be built by hobbyists, youth groups, and the Boy Scouts as a way of learning about the technology of radio. Today they are still sold as educational devices, and there are groups of enthusiasts devoted to their construction who hold competitions comparing the performance of their home-built designs.Crystal radios receive amplitude modulated (AM) signals, and can be designed to receive almost any radio frequency band, but most receive the AM broadcast band. A few receive shortwave bands, but strong signals are required. The first crystal sets received wireless telegraphy signals broadcast by spark-gap transmitters at frequencies as low as 20 kHz.