Recent content by jasonEE

  1. J

    Sound Level Indicator

    Hi audioguru, May I know what is c2 for in the first op-amp? thank you for your help
  2. J

    Sound Level Indicator

    Hello! I have some questions about this circuit: 1) what are the transistor using for ??? 2) how to evaluate the value when the light 10th is on ??? 3) the range for measurement is from 0db to 30 db ???? thank you for ur help............
  3. J

    Sound Level Indicator

    Hello! I have some questions about this circuit: 1) what are the transistor using for ??? 2) how to evaluate the value when the light 10th is on ??? 3) the range for measurement is from 0db to 30 db ???? thank you for ur help............
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