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Electronics Forum / Basics / January 2006parts resistors transistors
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 > I cant seem to find these transistors and resistors > > 4.7K Ohm 1/4-Watt Carbon Film Resistor 5% tolerance Radio Shack #271-1330 > NPN 2N222 rated 600mW - Case Type TO-92 I think you are looking for 2N2222. that is Radio Shack # 276-1617 > i have looked maplin, rs and ebay anyone know a uk website i can get > these from thanks > > I cant seem to find these transistors and resistors > > [quoted text clipped - 6 lines] > I think you are looking for 2N2222. > that is Radio Shack # 276-1617 No Radio Shack in the UK. Graham >> > I cant seem to find these transistors and resistors >> > [quoted text clipped - 10 lines] > > Graham 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 > 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 ) Absolutely. But Radio Shack sells "2N2222"'s in a TO-92 package. Search http://www.radioshack.com/home/index.jsp for part # 276-1617 > 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. A common substitute might be 2N4401. > > How about Maplin's or Radio Spares? > > [quoted text clipped - 3 lines] > > Absolutely. But Radio Shack sells "2N2222"'s in a TO-92 package. If it's not TO-18 it's not a 2N2222 ! You mean a PN2222. > Search > http://www.radioshack.com/home/index.jsp [quoted text clipped - 4 lines] > > A common substitute might be 2N4401. 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 >>>How about Maplin's or Radio Spares? >>> [quoted text clipped - 20 lines] > > Graham 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 >> > How about Maplin's or Radio Spares? >> > [quoted text clipped - 5 lines] > > If it's not TO-18 it's not a 2N2222 ! You mean a PN2222. 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. ;-) > That's a switching transistor. I think its beta isn't that great. I've > suggested 2N3904 or BC548 as a decent 'better' sub. I'm too lazy to look up 2N3904 - isn't that one just a little less robust than the venerable 2222? Thanks! Rich >> How about Maplin's or Radio Spares? >> [quoted text clipped - 4 lines] > Absolutely. But Radio Shack sells "2N2222"'s in a TO-92 package. Search > http://www.radioshack.com/home/index.jsp for part # 276-1617 >> 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. > > A common substitute might be 2N4401. Ah. Now I see where that other fellow got "2N222". ;-) Thanks! Rich > I cant seem to find these transistors and resistors > [quoted text clipped - 4 lines] > i have looked maplin, rs and ebay anyone know a uk website i can get > these from thanks 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. > http://www.maplin.co.uk/Search.aspx?criteria=2n2222&doy=26m1&source=15 91 p each !!!! Use this.... http://www.maplin.co.uk/Module.aspx?ModuleNo=32952&criteria=bc548b&doy=26m1 Graham > I cant seem to find these transistors and resistors > [quoted text clipped - 4 lines] > i have looked maplin, rs and ebay anyone know a uk website i can get > these from thanks 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 > I cant seem to find these transistors and resistors . . . > . . . anyone know a uk website i can get > these from thanks Try Farnell: http://uk.farnell.com/jsp/endecaSearch/partDetail.jsp?SKU=9339540&N=401 Mark |
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