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Joined: Jul 2002
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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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Joined: Jul 2002
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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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Joined: Oct 2000
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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!
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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.
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Joined: Aug 2003
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I have come across K as a solid state relay, German notation I think.
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Joined: Aug 2001
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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.
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Joined: Oct 2000
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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!
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Joined: Jul 2002
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Scott, Here are a few little known symbols:
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Joined: Oct 2000
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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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