glossary:glossary_p
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glossary:glossary_p [2015/01/09 02:17] – Changed the entry for Phase Modulation and Pulse Modulation which require a litte resorting of the entries on the page. No actual content of those entries were changed, just their titles, which then effected the alphabetical order in which they appear. Wayne | glossary:glossary_p [2020/12/07 16:23] – move POR to correct location JohnFletcher | ||
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===== PCB ===== | ===== PCB ===== | ||
- | Printed Circuit Board. Are usually made of [[http:// | + | 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# |
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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> | ||
+ | Used for the printable surface on some 3D printers, especially the Prusa range | ||
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===== PIC ===== | ===== 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. | ||
+ | A brand of micro processor chip from Microchip, often used in MERG projects. Eg PIC18F2480. | ||
+ | ===== PICKit ===== | ||
+ | A device marketed by [[http:// | ||
+ | The pin out of the PICKit differs from that of the programming connector on MERG CBUS boards, see **[[helpsystem: | ||
+ | ===== PiSo ===== | ||
+ | **P**arallel **i**n **S**erial **o**ut, refers to a type of [[glossary_s# | ||
- | 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 | + | =====PLA===== |
+ | [[wp> | ||
+ | [[wp> | ||
===== PM - Phase Modulation ===== | ===== PM - Phase Modulation ===== | ||
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- | Solenoid Point motor /relay driver with onboard | + | 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:// | ||
===== PNP ===== | ===== PNP ===== | ||
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- The orientation of the positive and negative poles in a battery or power supply relative to a circuit. | - The orientation of the positive and negative poles in a battery or power supply relative to a circuit. | ||
- The orientation of a magnetic field, relative to the surrounding environment. | - The orientation of a magnetic field, relative to the surrounding environment. | ||
+ | |||
+ | |||
+ | ===== POR ===== | ||
+ | |||
+ | |||
+ | |||
+ | Power on reset i.e. just turning the power on to the whole system. | ||
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Abbreviation for Potentiometer see below | Abbreviation for Potentiometer see below | ||
+ | |||
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- | Power supply unit | + | Power supply unit\\ |
+ | See also [[glossary: | ||
===== PTP ===== | ===== PTP ===== | ||
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RPC System - PTP (Point-to-Point) | RPC System - PTP (Point-to-Point) | ||
+ | ===== 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:// | ||
+ | [[http:// | ||
+ | [[http:// | ||
+ | [[http:// | ||
+ | [[http:// | ||
===== Pulse ===== | ===== Pulse ===== | ||
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- | ===== Pulsed output | + | ===== Pulse Width Modulation |
+ | 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 speed. The frequency at which the switching takes place will affect the behaviour of the motor but is typically between 100Hz and 20KHz. | ||
- | {{: | + | ===== Pulsed output ===== |
+ | {{: |
glossary/glossary_p.txt · Last modified: 2021/08/08 05:25 by Wayne