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Discussion in 'Datasheets, Manuals and Component Identification' started by gregrae, May 27, 2011.

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  1. gregrae

    gregrae

    67
    1
    Jan 12, 2011
    I require a Comparison's for
    KA 358 Op Amp

    and


    BD 139 NPN Transistor
    Hope you can help me out
     
  2. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,418
    2,788
    Jan 21, 2010
    One is an op-amp. The other is a transistor.

    Or do you, perhaps have something more specific in mind? What other information did your instructor give you?
     
  3. gregrae

    gregrae

    67
    1
    Jan 12, 2011
    Comparisn

    I have a Battery charger that has faulty components and I need a comparison as the supplier I use dose not have the items that I posted in the original post. The components in question are faulty.The supplier will not give me a subistute unless I nomate the component I require.
     
  4. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,418
    2,788
    Jan 21, 2010
    Ah, I see now. You want an alternative part to the ones you have listed. (You don't want us to compare an op amp and a transistor).

    The first issue is that it is difficult to specify a replacement part unless it is the same part with a different part number. There will be some differences in specs and these differences may be critical for the circuit's operation.

    That said, it's pretty rare for a part to be so critical in something like a battery charger (or indeed anything) that a close match won't work.

    OK, a BD139 is a very easily sourced component. As long as there's no voltages exceeding 50V in the charger, then a BD137 would be OK

    The KA358 is likewise pretty common.

    Who is your supplier? Sounds like Radio Shack or something.

    Where are you. Perhaps we can suggest someone who has these parts and is relatively local to you?
     
  5. gregrae

    gregrae

    67
    1
    Jan 12, 2011
    The supplier is in Sydney NSW Australia and is called WES.
    I live in Newcastle NSW Australia
     
  6. davenn

    davenn Moderator

    13,671
    1,892
    Sep 5, 2009
    ok

    the KA358 is just an LM358 by a different manufacturer
    why dont you go to Jaycar in Newcastle ?

    224 Maitland Road
    Islington NSW 2296
    (02) 4965 3799

    they have both those parts, as steve said they are nothing special

    BD139 is $1.00 and a LM358 is $1.95

    Dave
     
    Last edited: May 28, 2011
  7. gregrae

    gregrae

    67
    1
    Jan 12, 2011
    Thank you all for your help
     
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