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  1. J

    Sound Level Indicator

    OK thanks! I'm going to reverify it all! And I'll come back if necessary... J.
  2. J

    Sound Level Indicator

    Ok I'll check the voltage for the pins. And maybe the problem is in the transistors' connection. Where do I connect  the + of Q1 and Q3, on the +9V or the +5V? And another thing, I connected the LM2931AZ-5.0 on the same line as the LEDs, so do I have to supply it with current with the +9V? The...
  3. J

    Sound Level Indicator

    I don't think I substituted any parts. When I plug the battery to the circuit every LED works (even when there's no signal...) except the ones connected to the 10th pin on the LM3915. I looked around and I think it's maybe because of the 3rd pin of the LM3915 connected directly to the +9V...
  4. J

    Sound Level Indicator

    Thanks for the image, it's a bit better, and now I'm done with the circuit but when I supply it with current every LED lights and there's no sound around! What might be the problem? (And what's the order for the LEDs, is it 10 to 18 on the LM2915 or is it 18 to 10?) J.
  5. J

    Sound Level Indicator

    Thanks for the answer, but do you have a bigger and cleaner image of the circuit you used? Because I can't see well on the image you provide on the site. J.
  6. J

    Sound Level Indicator

    Hi Audioguru, It's me again after a long time, but I want to know what do you use to supply the circuit with current in the +9 adapter? Can't I use a 9 volt battery? Because I don't have any 7.2 volt battery. Jon
  7. J

    Sound Level Indicator

    Hi AudioGuru, It's me again. I want to know how many LEDs will light for how much dB if the range of the Sound Level Indicator is 45 dB to 95 dB? And another thing, who can it be 45 dB to 95 dB, the LM3195 only has 10 outputs in 3 dB steps for a total of 30 dB? J.
  8. J

    Sound Level Indicator

    Hi AudioGuru, Thanks for the answer, I'll try with your infos... I'll come back for more questions if needed.. J.
  9. J

    Sound Level Indicator

    Hi AudioGuru, I would like to know what to do if I want the range to be from 30 dB to maybe 120 dB? And can you provide the image of the back of you circuit board, to see how the connections are done? J.
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