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danliska78
New Member

1 Posts
Posted - Aug 16 2013 :  5:40:36 PM  Show Profile  Reply with Quote
Hey guys, I am going to use my super amateur skills and novice luck to try wire this up with LM-3915s to get 10 LED per frequency channel.

If anyone would be interested to help me out I would very much appreciated it.

So basically I'm going to insert this schema to replace the AN6884

If any of you electronic wizards reading this see problem help me out here. Its going to be a lot of try and error for me since I basically have no clue of what I'm doing.

Download Attachment: audio-level-meter-1.gif
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audioguru
Nobel Prize Winner

Canada
4218 Posts
Posted - Aug 17 2013 :  08:39:24 AM  Show Profile  Reply with Quote
If I was doing it I would re-design the filters so that NORMAL opamps can be used instead of the very odd and obsolete LM3900 IC.

The LM3915 works much better when its input has a peak detector circuit shown in its datasheet. Then every lighted LED has the same brightness.
Without peak detectors the lower level LEDs are bright and the higher level LEDs are dim and can barely be seen.
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