field-control triode
51Space charge — is a concept in which excess electric charge is treated as a continuum of charge distributed over a region of space (either a volume or an area) rather than distinct point like charges. This model typically applies when charge carriers have been… …
52Unijunction transistor — Unijunction transistors Circuit symbol A unijun …
53Headphones — For other uses, see Headphones (disambiguation). Sennheiser HD555 headphones, used in audio production environments …
54Variable capacitor — Rotary variable capacitor A variable capacitor (also known as a variable air condenser ) is a capacitor whose capacitance may be intentionally and repeatedly changed mechanically or electronically. Variable capacitors are often used in L/C… …
55Inductive output tube — The inductive output tube or IOT is a variety of vacuum tube which evolved in the 1980s to meet increasing efficiency requirements for high power RF amplifiers. The primary commercial use of IOTs is in UHF television transmitters, where they have …
56Electronic musical instrument — An electronic musical instrument is a musical instrument that produces its sounds using electronics. In contrast, the term electric instrument is used to mean instruments whose sound is produced mechanically, and only amplified or altered… …
57Electronics — refers to the flow of charge (moving electrons) through nonmetal conductors (mainly semiconductors), whereas electrical refers to the flow of charge through metal conductors. For example, flow of charge through silicon, which is not a metal,… …
58Darlington transistor — Circuit diagram of a Darlington pair using NPN transistors In electronics, the Darlington transistor (often called a Darlington pair) is a compound structure consisting of two bipolar transistors (either integrated or separated devices) connected …
59Ronald N. Bracewell — Infobox Scientist name = Ronald N. Bracewell box width = image width = caption = birth date = Birth date|1921|07|22 birth place = Sydney, New South Wales, Australia death date = Death date and age|2007|08|12|1921|07|22 death place = Stanford,… …
60Pressure measurement — The construction of a bourdon tube gauge, construction elements are made of brass Many techniques have been developed for the measurement of pressure and vacuum. Instruments used to measure pressure are called pressure gauges or vacuum gauges. A… …
