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glossary:glossary_g [2017/02/16 11:01]
WortingUK [Ground]
glossary:glossary_g [2018/12/16 11:29]
Mike Forrest
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 ~~NOTOC~~ ~~NOTOC~~
 [[start|Return to main Glossary index]] [[start|Return to main Glossary index]]
 +
 +===== Gerber =====
 +
 +A Gerber is a 2D binary vector image that describes every single layer of the PCB design. For instance, one Gerber describes the silk screen while the other describes the top, copper layer.
  
 ===== GIT repository ===== ===== GIT repository =====
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 ===== GPIO ===== ===== GPIO =====
  
-General-purpose input/​output is a generic pin on an integrated circuit or computer board whose behavior, including whether it is an input or output pin, is controllable by the user at run time+General-purpose input/​output is a generic pin on an integrated circuit or computer board whose behavior, including whether it is an input or output pin, is controllable by a program or script being run. 
  
 GPIO pins (generally) have no predefined purpose, and go unused by default. Normally these are Tri-State pins. GPIO pins (generally) have no predefined purpose, and go unused by default. Normally these are Tri-State pins.
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 In modern '​mains'​ AC power supplies, the '​Earth'​ line has a safety purpose and the '​Neutral'​ line is the '​Live'​ current return. NB: The Neutral is connected to Earth, somewhere further back in the supply system. In modern '​mains'​ AC power supplies, the '​Earth'​ line has a safety purpose and the '​Neutral'​ line is the '​Live'​ current return. NB: The Neutral is connected to Earth, somewhere further back in the supply system.
  
-Most modern low voltage and low power electronic circuits are NOT referenced to the Earth, but the name Ground (aka GND) or Earth persists as the reference point, but more correctly its name is '​0V'​. ​These power supplies ​are said to be '​floating'​. Floating power supply modules can sometimes be identified by the use of a 2 wire connection to the mains.+Most modern low voltage and low power electronic circuits are NOT referenced to the Earth, but that name or Ground (aka GND) persists as the reference point, but more correctly its name is '​0V'​. ​The power supply modules for these circuits ​are said to be '​floating'​. Floating power supply modules can sometimes be identified by the use of a 2 wire connection to the mains. No harm will happen if the 0V line is connected to Ground.
  
-Above a certain threshold of Voltage or Power (or where a metal case/​chassis is used), modern regulations mean that an Earth connection is required and those power supply modules will use a 3 wire connection to the mains. An example of this is the MERG DCC power block. ​+However, above a certain threshold of Voltage or Power or where a metal case/​chassis is used, modern regulations mean that an Earth connection is required and those power supply modules will use a 3 wire connection to the mains. An example of this is the MERG DCC power block. ​
  
glossary/glossary_g.txt ยท Last modified: 2018/12/16 11:29 by Mike Forrest