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I seriously do not think you understand or read the LM3915 or 16 PDF.
This IC takes any audio signal and lights a dot (led) according to audio amplitude http://shop.fiberopticproducts.com/index.php?route...
Then an instructable https://www.instructables.com/id/LM3915LM3916-VU-Me...
You will need an opto-isolator on each channel with the outputs in three parallel groups. For your easy, there are more pictures, including the marvelous quad IC.
There is no Best Answer for me here when you hijack an old question... A full schematic design takes more time then I want to allocate...
iceng do you have the electronic schematic of this project!!
That was before cad schematic capture programs and those files are long ago gone.
Today I would use a dollar piezo mike to provide an audio signal to the LM3915 operating in dot mode and place some optical isolators to control what you are after.
thank, but I have a question how do I split in three different channel green yellow and red? At the end I need three output to light three small light bulb! DC light bulb if possible!
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