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PC Board Notations? #31220 11/14/03 10:14 AM
Joined: Jul 2002
Posts: 8,337
Trumpy Offline OP
Member
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?.

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Re: PC Board Notations? #31221 11/14/03 10:34 AM
Joined: Jul 2002
Posts: 8,337
Trumpy Offline OP
Member
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. [Linked Image]

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

Re: PC Board Notations? #31222 11/14/03 06:45 PM
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Scott35 Online Happy
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Trumpy;

Sounds like a good idea (Component ID database).

Scott35


Scott " 35 " Thompson
Just Say NO To Green Eggs And Ham!
Re: PC Board Notations? #31223 11/15/03 02:34 PM
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pauluk Offline
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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.

Re: PC Board Notations? #31224 11/16/03 03:54 PM
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Pinemarten Offline
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I have come across K as a solid state relay, German notation I think.

Re: PC Board Notations? #31225 11/16/03 05:03 PM
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pauluk Offline
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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.

Re: PC Board Notations? #31226 11/18/03 01:07 AM
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Scott35 Online Happy
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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


Scott " 35 " Thompson
Just Say NO To Green Eggs And Ham!
Re: PC Board Notations? #31227 11/22/03 05:41 AM
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Scott35 Online Happy
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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 " 35 " Thompson
Just Say NO To Green Eggs And Ham!
Re: PC Board Notations? #31228 12/03/03 06:37 PM
Joined: Jul 2002
Posts: 8,337
Trumpy Offline OP
Member
Scott,
Here are a few little known symbols:
[Linked Image]

Re: PC Board Notations? #31229 12/04/03 11:46 PM
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Scott35 Online Happy
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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


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