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Thread: Transistor matching tester....help needed

  1. #11
    I have tried a number of different new transistors transistor tester 2.jpg the diagram is in the bedini manual

  2. #12

  3. #13
    iv never built that. it looks straight fwd ck a few transistor with d meter ck ur build/ then with a good transistor ck build
    be sure u build it exactly as it is ,use cheap transistors
    do u need to match gain for a multi transistors build ,if u havent built a single transistors [1 power 1 trigger] ssg yet [u should ]
    if u just need to ck trane use dmm


    https://www.youtube.com/watch?v=JLXKffm7VF4

    https://www.youtube.com/watch?v=BgT9-VRf1Cw

  4. #14
    I began to experiment substuting resistors instead of the pot and found if I had a resistance of 19k the meter would give a reading of about 40ma if I went a couple of thousand ohms each way needle of the meter droped way back to very little. seems to be a narrow sweet spot.
    Ian

  5. #15
    IAN
    There are many diy transistor testers out there with instructions ,or for sale cheap
    i have no experience with transistor matching . but i hear you will go through a lot of transistors to get a few that match
    guy

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