LED Bar Graph

Published

Introduction: 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........

Step 1: 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

hope you like the circuit... And please rate it

Share

    Recommendations

    • Planter Challenge

      Planter Challenge
    • Woodworking Contest

      Woodworking Contest
    • Clocks Contest

      Clocks Contest
    user

    We have a be nice policy.
    Please be positive and constructive.

    Tips

    Questions

    2 Comments

    what is the working principle of the circuit? correct me if i m wrong.
    when high frequency comes then the capacitor gets short (theoretically) then all LED's should glow simultaneously. and in case of low frequency no led should glow

    also what is the voltage rating of the capacitors?

    1 reply

    since the values of the capacitors are different all leds will not glow simultaneously