Abbreviations in circuits, and other random Questions

Discussion in 'General Electronics Chat' started by Nube, Jul 7, 2012.

  1. Nube

    Thread Starter New Member

    Jul 7, 2012
    2
    0
    This is the schematic I'm looking at:
    http://www.555-timer-circuits.com/toy-organ.html

    I'm very new to electronics and the circuit diagrams still look very daunting to me. When it says "100n" next to a capacitor, is that just an abbreviation for 100nF? On that schematic, there is also something that says "10u" next to an electrolytic capacitor. What does that mean? Is that supposed to stand for 10μF? Also, if there was no sign next to a capacitor in a schematic and just said "100" should I assume it means 100μF? And in resistors, if it just had a number, should I also assume that it means 100Ω? In that schematic there was also a "8R Speaker". What does R stand for? I heard that it meant 8Ω Speaker, but I don't understand how resistance has anything to do with Speakers.

    Another unrelated question: I bought a pack of PNP transistors at Radio Shack. I know that transistors amplify current, but how do you know by how much? Do all transistors amplify the same amount of current? Are all of my transistors in that pack the same?

    Thanks so much for the help, I'm still a nube and I appreciate your time!

    Christian
     
  2. MrChips

    Moderator

    Oct 2, 2009
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    yes
    yes
    yes
    yes
    R stands for ohms
    Speakers have impedance, measured in ohms
    transistors have a rated current gain beta or hFE which is listed in the specs
    no
    no
     
    KJ6EAD likes this.
  3. WBahn

    Moderator

    Mar 31, 2012
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    KJ6EAD likes this.
  4. MrChips

    Moderator

    Oct 2, 2009
    12,440
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    Note the different styles between MBahn's responses and mine. Different strokes for different folks.
     
  5. crutschow

    Expert

    Mar 14, 2008
    13,002
    3,229
    The terse versus the verbose. ;)
     
  6. WBahn

    Moderator

    Mar 31, 2012
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    Or is it the verse and the terbose? ;)
     
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