Related To
PC Board Notations Thread
Simple Components Listings
(Symbols + Common Circuit Board IDs):
The following graphics contain commonly used Electronic and Electrical Component
Symbols, brief descriptions, and Alpha Numeric Identifiers - as found
on typical Printed Circuit Boards (PCB).
Symbols lists include:
* Basic Circuit Elements - (Battery, Switches, Relay, OCPD, Ground Symbols),
* Transformers And Inductors - (Isolated Transformer, Autotransformer, Inductor),
* Basic Discrete Components - (Resistor, Capacitor, Crystal, Lamps),
* Diodes - (Diode, LED, Zener, Schottky, Rectifier),
* Discrete Components: Thyristors - (DIAC, TRIAC, SCR, PUT, SBS, MOV),
* Discrete Components: Transistors - (Bipolar, JFET, MOSFET, IGFET),
* Integrated Circuits (IC) - (PGA / TCP, DIP, Pinouts),
* Logic Gates - (AND, NAND, OR, NOR, XOR, NOT, Amplifier).
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Text Snipped From Thread "PC board Notations" (linked at top of this message):
C= Capacitor
Q= Transistor
R= Resistor
L= Inductor
D= Diode
ZD= Zener Diode
SCR= Silicon Controlled Rectifier
T= Transformer
IC= Integrated Circuit (Chip)
BR= Bridge Rectifier
Tr= Triac
S= Switch
Vss= Negative Rail
Vdd/Vcc =Positive Rail
VR= Variable Resistance (aka Potentiometer or Rheostat)
R = resistor is fairly universal, but when it comes to potentiometers,
for example, some people use VR, others use RV, and still others
just label them R in sequence with fixed resistors.
Transistors are typically designated Q for the U.S. market, but
often TR or Tr in Britain. The same goes for integrated circuits and
the respective U and IC labels.
I have come across K as a solid state relay, German notation I think.
I've seen K used to designate normal mechanical relays in U.S. schematics too.
Not really relevant to modern computer boards, but one relay
labeling system I do like is the old scheme used by the British GPO
(and some others). Each relay is given an RL code followed by its
own letter.
The coil on a schematic is labeled something like RLC/4. (It would
actually be a horizontal bar with the RLC above and the 4 below it.)
This designates relay C, and tells you that it has 4 sets of
contacts. The contacts on the diagram are then labeled RLC1, RLC2, etc.
This was very useful in telephone work and any other similar relay
systems where a coil could operate as many as 8 or 10 sets of contacts.
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*** Graphical Images Below ***
end... Part 1 of 2
posted 11.22.2003 by S.E.T. (Scott35)