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This is a simple vu meter people normally use Vu meters to get a good appearance for their amplifiers and for their audio setups.Here I have used common Ic LM3915 and LM3916.You can fix 19 LEDs for this circuit diagram. Note # you can operate this circuit with 12V power supply # Fix this circuit ona PCB to get good result.

Most of our members asked pulse generator circuits. so this is a simple and common circuit.and you can use this with your light circuit diagrams too. Note # Don't supply more than 15V

This is simple audio power meter.When you use high power speakers this circuit is so important Because you can keep your speakers without burning.Here When the speaker out puts 1W green color LED will light up,for 1.5W you will be able to see orange color,When speaker out puts more than 3W you will be able to see red color. Note # The power levels mentioned are valid for 4-Ohm speakers. For 8-Ohm speakers you have to divide all the resistor values by two # this circuit cant drive more than 40W continuously. # If you want more LEDs you can attach LEDs as the same way

This is an indicator you can use this circuit with your Ac electronic items.Here I have used normal Led.Attach purple color connections to the AC line.I suppose this will be a wonderful circuit for you. Note # This is not a good circuit for kids Because here we use 230V So don't try to build this. # Build this circuit on a PCB