Using LM 3909 LED flasher IC, can be designed various electronic projects. As you can see in this circuit diagram, using the LM3909 LED flasher IC can be designed a very simple color organ. But this circuit is not complicated, it use just some common active audio filters for filtering audio signals and a part formed by a LM3909 IC. This is the figure of the circuit;
All of three active filters drives the audio spectrum into three bands drive rectifiers and then drive IC2,3 and 4, flashing the LEDs at 6 Hz. D4,D5 and D6 should be three different colors for best effect. In the table bellow you can see all electronic parts required by this color organ project.
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