Instructables
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Picture of LED Bar Graph
this led bar graph contains only three LED s and each LED show the low, mid range and high frequencies according to the audio played, this bargraph can be used in audio amplifiers, the circuit is for a 40w amplifier,  connect the circuit in parallel to the speakers and no external power supply is needed........
 
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Step 1: Parts list

Picture of Parts list
1 x red LED ( or any color you like)
1 x Blue LED (or any color you like)
1 x Green LED (or any color you like)
1 x 1uf capacitor (electrolytic) 16v
1 x 3.3uf capacitor 16v
1 x 4.7uf capacitor 25v 

Step 2: Circuit diagram

make the circuit according to the circuit diagram

Step 3: Conclusion

Picture of conclusion
hope you like the circuit... And please rate it