I've just been looking over the PC board of my Computer M/Board and although the codes look a wee bit foreign, I can work them out, through having worked with Radio's and TV's, etc, for some years.
But, I was wondering if you guys had seen any unusual PC Board markings that we could build up in a list in the Technical Reference Area, if I have Scott35's approval.
What do you guys reckon?.

For a start:

• 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)

Just an idea.

[This message has been edited by Trumpy (edited 11-14-2003).]

Trumpy;

Sounds like a good idea (Component ID database).

Scott35

There's quite a bit of variation in the designations used by various manufacturers.

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.

I am going to Copy this thread's text and Paste it to a .DOC, for editing.
Once all data is compiled, I will post the items in the reference section.

I'll add anything else which applies (if I find anything or if anyone wants to send to me via E-Mail).

Scott35

I have posted a few documents relative to this thread, which may be found at the Technical Reference area under the topic:

Components Listings
https://www.electrical-contractor.net/ubb/Forum15/HTML/000088.html

Let me know if things look OK.

Scott35

Scott,
Here are a few little known symbols:

Trumpy;

Those are GREAT!!! I especially love the Butterworth Filter, the Slug Tuned-Coil, and the "PI" filter!!!

Have to add this to the list!

Scott35

Hehe! Great!

i've got something equal to this pic in digital schematics, but will have to translate it to english first.

K is used in germany for contactors and relays.
I've come across V for transistors too.

edit: well, the most jokes are gone if i translate this. just a cut-out
.....



[This message has been edited by :andy: (edited 12-05-2003).]