Hi, I have made up an Audio Level Meter based on the LM3914 Dot/Bar display driver and it uses the LED-RAINBOW with 10 different colors as the bar graph display. You can cascade a few pieces together to make an audio spectrum display. The audio signal can be connected by the 3.5mm audio jacks and the signal gain can be adjusted by the operational amplifier with a single potentiometer. This module can be powered by a single 5V USB power supply where it can be found from any PC USB port or any USB power transformer. It works perfectly with most computers, mp3 players, mobile phones or any audio devices with a 3.5mm audio plug.
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