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identifying transistor

Discussion in 'Electronic Repair' started by frank, Oct 9, 2009.

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  1. frank

    frank Guest

    Hello all,

    I need to replace a transistor which only markings are the motorola logo
    and "9570". It's TO-92 case and NPN (measured a good one in the same
    circuit).
    Any hint on specs about it are welcome.
    Regards

    Frank IZ8DWF
     
  2. frank

    frank Guest

    I don't have a schematic, it's an old VHF transceiver board that I
    wanted to debug. I don't even have the transceiver shell to identify it.
    Of course if I had a schematic I could guess better.

    Thanks
    Frank IZ8DWF
     
  3. N_Cook

    N_Cook Guest


    what sort of date ?
     
  4. frank

    frank Guest

    on the board it is printed 19 MAI 1982, looks like a date in some
    language.

    Regards
    Frank IZ8DWF
     
  5. N_Cook

    N_Cook Guest


    Looks as though you'll have to desolder that other one and measure the gain
    at different f and repeated with some added pF, and if darying try and find
    Vc and Ic max or at least some minimum values from the circuit their in
     
  6. Franc Zabkar

    Franc Zabkar Guest

  7. frank

    frank Guest

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