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#148749 11/22/03 05:34 AM
Joined: Oct 2000
Posts: 2,722
Scott35 Offline OP
Broom Pusher and
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).

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.


*** Graphical Images Below ***

[Linked Image]

[Linked Image]

[Linked Image]

[Linked Image]

end... Part 1 of 2
posted 11.22.2003 by S.E.T. (Scott35)

Scott " 35 " Thompson
Just Say NO To Green Eggs And Ham!
#148750 11/22/03 05:36 AM
Joined: Oct 2000
Posts: 2,722
Scott35 Offline OP
Broom Pusher and
Part 2 of 2:

[Linked Image]

[Linked Image]

[Linked Image]

[Linked Image]

end...complete document.
Posted 11.22.2003 by S.E.T. (Scott35)

Scott " 35 " Thompson
Just Say NO To Green Eggs And Ham!

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