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Discussion in 'Electronic Basics' started by AMX, Jan 26, 2006.

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  1. AMX

    AMX Guest

    I cant seem to find these transistors and resistors

    4.7K Ohm 1/4-Watt Carbon Film Resistor 5% tolerance

    NPN 2N222 rated 600mW - Case Type TO-92

    i have looked maplin, rs and ebay anyone know a uk website i can get
    these from thanks
     
  2. Radio Shack #271-1330
    I think you are looking for 2N2222.
    that is Radio Shack # 276-1617
     
  3. PeteG

    PeteG Guest

    http://www.maplin.co.uk/Search.aspx?criteria=2n2222&doy=26m1&source=15

    http://www.maplin.co.uk/Search.aspx?criteria=4k7&doy=26m1&source=15

    The resistor is a pack of 10 x 0.6W 1% which will substitue for the one you
    specify without a problem.
     
  4. Pooh Bear

    Pooh Bear Guest

    You obviously didn't look that hard. Try searching "4k7" on the site.

    I'd suggest you find a substitute for the 2N2222. It's in a hermetic
    metal can package and is quite expensive. Try BC548 for example.

    Graham
     
  5. Pooh Bear

    Pooh Bear Guest

    No Radio Shack in the UK.

    Graham
     
  6. Rich Grise

    Rich Grise Guest

    How about Maplin's or Radio Spares?

    And, just for the record, Radio shack doesn't have 2N2222's - it
    has PN2222's, which are the plastic version. ;-) (Do I get any
    points for one-upping John P? ;-D )

    And, depending on the circuit, it _could_ be replaced by almost
    any NPN small signal transistor, depending on which are the
    "important" specs in the app.

    And if you haven't found a 4.7K 1/4W 5% resistor, you haven't
    been looking very hard.

    This can be substituted by any 4.7K resistor (well, maybe not
    wirewound - again, depends on the app) with a power rating of
    1/4 W or more, and a tolerance of 5% or better (i.e, a smaller
    percentage value is a better tolerance, like 2%, 1%, etc.)

    Try googling on "electronics suppliers UK" or something.

    Good Luck!
    Rich
     
  7. Absolutely. But Radio Shack sells "2N2222"'s in a TO-92 package. Search
    http://www.radioshack.com/home/index.jsp
    for part # 276-1617
    A common substitute might be 2N4401.
     
  8. Pooh Bear

    Pooh Bear Guest

    If it's not TO-18 it's not a 2N2222 ! You mean a PN2222.
    That's a switching transistor. I think its beta isn't that great. I've
    suggested 2N3904 or BC548 as a decent 'better' sub.

    Graham
     
  9. ehsjr

    ehsjr Guest

    Fairchildsemi calls it a "General Purpose Amplifier".

    The BC548 can't hold a candle to a PN2222 or a 2N4401
    for Ic, and won't meet the op's spec for 600 mW. The 2N3904
    might be ok, but it still trails the PN2222 and 2N4401 by a
    huge margin (200 mA vs 500 mA) in Ic. Beta for the PN2222 or
    2N4401 is far better at 100 mA (Ic) and above than the 2N3904,
    and 100 mA is the maximum for the BC548.

    If we knew that the op's circuit ran say 50 mA Ic, then, all
    other conditions being equal, the BC548 or 2N3904 would be
    good choices to replace the 2N or PN 2222. But not knowing,
    the 2N4401 is a much better choice.

    Ed
     
  10. redbelly

    redbelly Guest

  11. Rich Grise

    Rich Grise Guest

    Ah. Now I see where that other fellow got "2N222". ;-)

    Thanks!
    Rich
     
  12. Careful, Pooh. I got in trouble only a few days ago, saying, "If it's not
    plastic, it's not a 1N400X!" ;-) (well, I didn't say, "ex", but whichever
    one it was - either 4004 or 4007, which other ones do they bother to
    put on the market?)

    And John, being cleverer than both of us put together, did enclose the
    alleged part number in quotes. ;-)
    I'm too lazy to look up 2N3904 - isn't that one just a little less
    robust than the venerable 2222?

    Thanks!
    Rich
     
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