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glossary:glossary_p [2014/11/11 13:29]
127.0.0.1 external edit
glossary:glossary_p [2020/01/27 11:56] (current)
Bob Vetterlein
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     - The condition in which two comparably sized objects or figures are equidistant at all facing points parallel).\\ ​     - The condition in which two comparably sized objects or figures are equidistant at all facing points parallel).\\ ​
  
-===== PCB - Printed Circuit Board =====+===== PCB =====
  
-Usually ​made of [[http://​en.wikipedia.org/​wiki/​FR-4|Fibreglass]] or [[http://​en.wikipedia.org/​wiki/​FR-2|SRBP]] (Synthetic Resin Bonded Paper) with a copper laminate on one or both sides, forming the electrical circuit. A detailed Wikipedia article is available [[http://​en.wikipedia.org/​wiki/​Printed_circuit_board|here]]. Most MERG [[glossary_k#​kits|Kits]] contain a PCB, the majority of them are single sided through hole construction. As the electronics become more sophisticated so double sided and surface mount technologies are being introduced.+Printed Circuit Board. Are usually ​made of [[wp>FR-4|Fibreglass]] or [[wp>FR-2|SRBP]] (Synthetic Resin Bonded Paper) with a copper laminate on one or both sides, forming the electrical circuit. A detailed Wikipedia article is available [[wp>Printed_circuit_board|here]]. Most MERG [[glossary_k#​kits|Kits]] contain a PCB, the majority of them are single sided through hole construction. As the electronics become more sophisticated so double sided and surface mount technologies are being introduced.
  
  
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 The PECO implementation of the Point motor, notable because they are constructed so as to be directly attached to both N and 00 gauge PECO track, thus making it easier to line up the pull and throw of the point The PECO implementation of the Point motor, notable because they are constructed so as to be directly attached to both N and 00 gauge PECO track, thus making it easier to line up the pull and throw of the point
 +
 +===== PEI =====
 +
 +[[wp>​Polyetherimide|Polyetherimide]]\\ ​
 +Used for the printable surface on some 3D printers, especially the Prusa range
  
  
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-===== Phase Modulation (PM) ===== 
  
 +===== PIC =====
 +Peripheral Interface Controller. A complex integrated circuit which may be programmed to carry out a controlled sequence of events, ie certain output events controlled by an input event.
  
-specialist modulation mainly ​used in Radar equipment, ​the phase rather than the frequency ​of the carrier wave is varied ​in order to obtain information+brand of micro processor chip from Microchip, often used in MERG projects. Eg  PIC18F2480. 
 +===== PICKit ===== 
 +A device marketed by [[http://​www.microchip.com/​Developmenttools/​ProductDetails.aspx?​PartNO=PG164130|Microchip]] for programming their PIC microcontrollers. Beware of imitations.\\ \\  
 +The pin out of the PICKit differs from that of the programming connector on MERG CBUS boards, see **[[helpsystem:​pickit2cbus|here]]** for details ​of how to build a connecting lead. A useful pdf is available from the [[http://​picprojects.org/​projects/​ICSP/​icsp-info.pdf|Picprijects website]], detailing the pin out of various PIC packages. 
 +===== PiSo ===== 
 +**P**arallel **i**n **S**erial **o**ut, refers to a type of [[glossary_s#​shift_register|Shift Register]] where data present on a set of input pins is captured by application of a strobe pulse and then presented on a single output pin under control of a [[glossary_c#​clock|clock]]. For a graphic description see [[glossary:​shiftinout|Shift ​in/out]].
  
 +=====PLA=====
 +[[wp>​Polylactic_acid|Polylactic Acid]] a plastic used in 3D printing\\ ​
 +[[wp>​Programmable_logic_array|Programmable Logic Array]] a kind of programmable logic device used to implement combinational logic circuits.
 +===== PM - Phase Modulation =====
  
-===== PIC =====+Phase Modulation. A specialist modulation mainly used in Radar equipment, the phase rather than the frequency of the carrier wave is varied in order to obtain information
  
  
-A complex integrated circuit which may be programmed to carry out a controlled sequence ​of eventsie certain output events controlled by an input event+===== PM - Pulse Modulation ===== 
 + 
 + 
 +There are basically 3 forms of pulse modulationAmplitude, Position, and width, each having its own characteristics and uses. This type of modulation may be superimposed onto RF or on DC voltages.
  
  
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-Solenoid Point motor /relay driver with onboard ​relay see TBG16/26+Solenoid Point motor /relay driver with on board relay see TBG16/26
  
 +===== PMP =====
  
 +Pocket Money Project. Excellent simple, basic and inexpensive kits to learn basic electronic theory and techniques such as soldering. Currently there are 23 Kits and most cost less than £2.00. You can find them in the Kit Locker [[https://​www.merg.org.uk/​merg_kitlocker/​section.php?​id=31|here]].
 ===== PNP ===== ===== PNP =====
  
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-Power supply unit +Power supply unit\\  
 +See also [[glossary:​glossary_d#​dirty_psu|Dirty PSU]]
  
 ===== PTP ===== ===== PTP =====
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 RPC System - PTP (Point-to-Point) ​    \\ Self contained (non-PC) automatic data transfer system for up to 960 functions each way, using standard [[rpcsystem#​ptp|RPC Modules]]. Includes PCBs and all components. RPC System - PTP (Point-to-Point) ​    \\ Self contained (non-PC) automatic data transfer system for up to 960 functions each way, using standard [[rpcsystem#​ptp|RPC Modules]]. Includes PCBs and all components.
  
 +===== PTP-Lite =====
 +Multiplex system using a RS485 bus, matching pairs of input and output modules communicate under the control of a master module.\\ ​
 +For details see these TBs:
 +[[http://​www.merg.org.uk/​merg_tbs/​download.php?​fileid=1054|LC02/​01]], ​
 +[[http://​www.merg.org.uk/​merg_tbs/​download.php?​fileid=1055|LC02/​02]], ​
 +[[http://​www.merg.org.uk/​merg_tbs/​download.php?​fileid=1056|LC02/​03]], ​
 +[[http://​www.merg.org.uk/​merg_tbs/​download.php?​fileid=1066|LC02/​04]] & 
 +[[http://​www.merg.org.uk/​merg_tbs/​download.php?​fileid=1067|LC02/​05]].\\ ​
  
 ===== Pulse ===== ===== Pulse =====
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-===== Pulse Modulation ===== 
  
 +===== Pulse Width Modulation =====
  
-There are basically 3 forms of pulse modulation, Amplitude, Position, ​and width, each having its own characteristics ​and usesThis type of modulation may be superimposed onto RF or on DC voltages. +Pulse Width Modulation is a technique used to control devices such as motors and lights to vary the amount ​of power supplied to the device. The power supply to the device is switched between off and on such that the average power to the device can be varied between 0% - always off to 100% - always on. For example if the wave form is switched so that a motor is connected to power supply for 75% of the time then it will receive approximately 75% power and run at a slower speedThe frequency at which the switching takes place will affect the behaviour ​of the motor but is typically between 100Hz and 20KHz.
  
 ===== Pulsed output ===== ===== Pulsed output =====
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 {{:​glossary:​pulses-4.gif}} {{:​glossary:​pulses-4.gif}}
- 
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glossary/glossary_p.1415712585.txt.gz · Last modified: 2015/01/09 01:59 (external edit)