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Recent content by johnson pay

  1. J

    OP AMP calculation ,I need your help to find out V1,V2 and V3 voltage.

    The expression is 100Y = 30V1+59V2+11V3,my friend answer is v1=1v,v2=2v,v3=3v,but I don't know he how to get it, anybody can try to solve it.thanks
  2. J

    electronic circuit calculation

    The answer is 4v,vin is open circuit so the 6R is ignore ,open circuit current=0,voltage=0. Thanks for your help godfreyl and Dan Mills. Regards, Johnson.
  3. J

    electronic circuit calculation

    Who can help me to calcurate the Vin ,and write down the step for me ,thanks:-o
  4. J

    Smd zener diode code

    But the PCB board marking ZD
  5. J

    Smd zener diode code

    Anybody know this 68F component ,this component look like transistor but not this is zener diode
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