To start this cool LED equalizer, user needs to give power to the circuit and connect one end of 3.5mm Aux cable to the mobile or Laptop and the second end of the aux wire to the Circuit. This circuit can work from 3.3v to 18v, but for a better result, I recommended to use 12v. In this circuit LEDs are connected at Reverse Logic, means negative terminals of LEDs are connected to the output of the comparators and when comparator output is high LED will be off and when output is Low then LED will be On. Here one more advantage of POT (variable resistor) is that we need not to change values of all resistors for changing the reference voltage for each comparator, instead we can adjust it by only using the POT. Reference voltage at not-inverting terminal (+), is adjusted by voltage divider circuit, built by using a pot and 1k resistors. Here we have used 8 comparators using four LM358 ICs, which will compare audio voltage signal with reference voltage. User may also use two LM324 IC which has four op-amps inside, but it will complex the circuit on the Breadboard. In this project, we have used four LM358 dual op-amp IC which is easily available in the market and contains two comparator inside. This VU meter is very simple, cheap and interesting project for the learner. Today we are building another and most Simple Volume meter which only uses four LM358 op-amp ICs as major components. The later one was built on PCB as Arduino Shield. Previously we have built VU Meter using LM3914 in which audio input is taken from Condenser Mic and also built another VU Meter using Arduino in which audio input is taken from 3.5 mm jack. Volume Meter (VU) is an indicator or representation of the intensity of sound level over LEDs and can also serve as a volume measurement device. In which we can see the dancing of LEDs according to the music, if music is loud then equalizer go to its peak and more LEDs will glow, and if music is low then lesser number of LEDs shall glow. We can consider the Volume Meter as an Equalizer, which is present in the Music systems. VU Meter or Volume Meter is very popular and fun project in Electronics.
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