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glossary:glossary_m [2013/04/07 15:06]
Bob Vetterlein [Magnet]
glossary:glossary_m [2021/08/11 11:57] (current)
WortingUK [Microprocessor]
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-======= Glossary M ======= +====== Glossary M ====== 
-~~NOTOC~~ + 
-[[start|Return to main Glossary index]]+ 
 +[[:glossary:start|Return to main Glossary index]]
  
  
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-A magnet is an object that has a magnetic field. It can be in the form of a permanent magnet or an electromagnet.     \\ [[wp>Magnet]]+A magnet is an object that has a magnetic field. It can be in the form of a permanent magnet or an electromagnet.\\  
 +[[wp>Magnet|Magnet]] 
  
 ===== Matrix ===== ===== Matrix =====
  
-[[:helpsystem:matrix|Main article]] +[[wp>Diode_matrix|Wikipedea's Matrix entry]]\\  
 +[[:helpsystem:matrix|Main article]] available to MERG Members only.
  
 +===== Memory Wire =====
 +Wire made from a special alloy which changes its molecular structure at a certain temperature causing it to shrink. This effect can usefully be applied to point and signal actuation. Some types require a tension spring to pull it back to its original length while others will return unaided, although a spring is still required to keep the wire tight, it can only pull when shrinking, it cannot push.\\ 
 +[[wp>Shape-memory_alloy|Wikipedia's entry]]\\ 
 +See also TBs: [[http://www.merg.org.uk/merg_tbs/download.php?fileid=919&userid=62|G19/01]], 
 +[[https://www.merg.org.uk/merg_tbs/download.php?fileid=920|G19/02]], 
 +[[https://www.merg.org.uk/merg_tbs/download.php?fileid=922|G22/01]], 
 +[[https://www.merg.org.uk/merg_tbs/download.php?fileid=923|G23/01]] & 
 +[[https://www.merg.org.uk/merg_tbs/download.php?fileid=924|G23/02]].\\ 
 ===== Microprocessor ===== ===== Microprocessor =====
  
  
-A microprocessor (sometimes abbreviated µP) is a programmable digital electronic component that incorporates the functions of a central processing unit (CPU) on a single semiconducting integrated circuit (IC).     \\ [[wp>Microprocessor]] +A microprocessor (sometimes abbreviated µP) is a programmable digital electronic component that incorporates the functions of a central processing unit (CPU) on a single semiconducting integrated circuit (IC).\\  
 +[[wp>Microprocessor|Microprocessor]]
  
 +microprocessor is a general-purpose name. Specialised devices:\\
 +A digital signal processor (DSP) is specialized for signal processing.\\
 +Graphics processing units (GPU) for rendering of images.\\
 +Microcontrollers integrate a microprocessor with peripheral devices in embedded systems..\\
 +System On Chip (SoC) often integrate one or more microprocessor cores with bus controllers.
 ===== Mobile decoder ===== ===== Mobile decoder =====
  
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-Is the process of superimposing information onto a pure sine wave (Carrier wave), this process can be achieved by any of fourmethods, amplitude (AM), frequency (FM), Phase (PM) or Pulse (PAM, PWM, or PPM)+Is the process of superimposing information onto a pure sine wave (Carrier wave), this process can be achieved by any of four methods, amplitude (AM), frequency (FM), Phase (PM) or Pulse (PAM, PWM, or PPM)
  
  
-===== Multiplexor =====+===== MOMS ====
  
 +MERG Online Membership System - MERG's membership management system - used by Members to manage their contact details and renew membership and by the Membership Secretary for administration purposes. Available via the MERG Forum [[https://www.merg.org.uk/forum/index.php|{{:glossary:moms-link-01.png?nolink|}}]]
 +
 +===== Monostable =====
 +An electronic circuit that has a single (mono) stable state and an unstable state, an input will cause the circuit to assume the unstable state, when the input signal is removed and after a predictable delay the circuit will return to the stable state. This behaviour is the basis of most timer circuits.
 +===== MOSFET Metal-Oxide-Semiconductor Field-Effect Transistor =====
 +
 +A MOSFET is a type of transistor with a Gate, Source and Drain terminals. [[wp>MOSFET|MOSFET]].
 + They are the dominant type of transistor in electronics.\\
 +The resistance between Source and Drain (D-S) is controlled by the Voltage applied across the Gate and Source.
 +A Voltage across D-S causes a current to flow in the D-S resistance. There are several sub-types...\\
 + - N channel uses positive Voltages or P channel uses negative Voltages \\
 + - Depletion mode uses increasing Gate Voltage to increase D-S resistance or Enhancement mode uses decreasing Gate Voltage to decrease D-S resistance\\
 +For MERG, the common type is N channel Enhancement mode.\\
 +//Compapared to a Bipolar transistor, Gate = Base, Source = Emitter, Drain = Collector.//
 +
 +
 +The Gate exhibits a very high resistance (insulation) to the Source or Drain.\\
 +There being an insulation, the Gate has capacitance to the other pins and needs to be driven by a low impedance (AC resistance) input signal. A high impedance input signal will make the device slow. An open circuit Gate can build up a charge and results in the D-S going low resistance (turns 'ON').
 +
 +===== MSAG =====
 +
 +**M**ERG **S**omerset **A**rea **G**roup
 +
 +===== Multiplexor =====
  
-A communications device that multiplexes (combines) several signals for transmission over a single medium. A demultiplexor completes the process by separating multiplexed signals from a transmission line. Frequently a multiplexor and demultiplexor are combined into a single device capable of processing both outgoing and incoming signals.     \\ A multiplexor is sometimes called a mux and also spelled as multiplexer.     \\ [[http://www.webopedia.com/TERM/M/multiplexor.html|http://www.webopedia.com/TERM/M/multiplexor.html]] 
  
 +A communications device that multiplexes (combines) several signals for transmission over a single medium. A demultiplexor completes the process by separating multiplexed signals from a transmission line. Frequently a multiplexor and demultiplexor are combined into a single device capable of processing both outgoing and incoming signals.\\ 
 +A multiplexor is sometimes called a mux and also spelled as multiplexer.\\ 
 +[[http://www.webopedia.com/TERM/M/multiplexor.html|http://www.webopedia.com/TERM/M/multiplexor.html]]
  
glossary/glossary_m.1365347181.txt.gz · Last modified: 2014/11/11 13:27 (external edit)