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#31220 - 11/14/03 06:14 AM PC Board Notations?
Trumpy Offline


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Registered: 07/05/02
Posts: 8211
Loc: SI,New Zealand
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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#31221 - 11/14/03 06:34 AM Re: PC Board Notations?
Trumpy Offline


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Registered: 07/05/02
Posts: 8211
Loc: SI,New Zealand
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).]
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#31222 - 11/14/03 02:45 PM Re: PC Board Notations?
Scott35 Offline

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Loc: Anaheim, CA. USA
Trumpy;

Sounds like a good idea (Component ID database).

Scott35
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#31223 - 11/15/03 10:34 AM Re: PC Board Notations?
pauluk Offline
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Registered: 08/11/01
Posts: 7520
Loc: Norfolk, England
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.
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#31224 - 11/16/03 11:54 AM Re: PC Board Notations?
Pinemarten Offline
Member
Registered: 08/23/03
Posts: 123
Loc: Edmonton, AB, Canada
I have come across K as a solid state relay, German notation I think.
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#31225 - 11/16/03 01:03 PM Re: PC Board Notations?
pauluk Offline
Member
Registered: 08/11/01
Posts: 7520
Loc: Norfolk, England
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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#31226 - 11/17/03 09:07 PM Re: PC Board Notations?
Scott35 Offline

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Registered: 10/19/00
Posts: 2707
Loc: Anaheim, CA. USA
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
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Scott " 35 " Thompson
Just Say NO To Green Eggs And Ham!
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#31227 - 11/22/03 01:41 AM Re: PC Board Notations?
Scott35 Offline

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Registered: 10/19/00
Posts: 2707
Loc: Anaheim, CA. USA
I have posted a few documents relative to this thread, which may be found at the Technical Reference area under the topic:

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

Let me know if things look OK.

Scott35
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Scott " 35 " Thompson
Just Say NO To Green Eggs And Ham!
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#31228 - 12/03/03 02:37 PM Re: PC Board Notations?
Trumpy Offline


Member
Registered: 07/05/02
Posts: 8211
Loc: SI,New Zealand
Scott,
Here are a few little known symbols:
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#31229 - 12/04/03 07:46 PM Re: PC Board Notations?
Scott35 Offline

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Registered: 10/19/00
Posts: 2707
Loc: Anaheim, CA. USA
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
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