VU Meter Using 3915 IC

Hii friend,

Today I am going to make a VU Meter Meter circuit that will show the level of audio in the LED.In this VU Meter I will use 10 LED.

Let's get started,

(1.) IC - 3915 x1

(2.) IC base - 18 Pin x1

(3.) Battery - 9V x1

(4.) Battery clipper x1

(5.) Resistor - 1K x1

(6.) Preset - 10K x1

(7.) LED - 3V x10 {Any color}

(8.) Zero PCB

This is the circuit diagram of this VU Meter.

Connect all components according to this circuit diagram.

Firstly we have to Put all LEDs to the PCB as you want color of LEDs.

+ve legs of LEDs should be upper side and -ve legs should be in the downward side.

Next we have to put IC Base to the PCB as you can see in the picture.

Next solder +ve legs of all LEDs to each other and

Solder All Pins of IC Base and -ve legs as you can see in the picture.

Next Connect -ve Legs of LEDs to the IC base as given in the circuit diagram.

Solder -ve leg of LED-1 to Pin-1 of the IC,

Solder -ve leg of LED-2 to Pin-18 of the IC,

Solder -ve leg of LED-3 to Pin-17 of the IC,

Solder -ve leg of LED-4 to Pin-16 of the IC,

Solder -ve leg of LED-5 to Pin-15 of the IC,

Solder -ve leg of LED-6 to Pin-14 of the IC,

Solder -ve leg of LED-7 to Pin-13 of the IC,

Solder -ve leg of LED-8 to Pin-12 of the IC,

Solder -ve leg of LED-9 to Pin-11 of the IC and

Solder -ve leg of LED-10 to Pin-10 of the IC as you can see in the picture.

Next connect 1K Resistor to the circuit.

Solder 1K Resistor Between Pin-7 to Pin-8 of the IC as you can see in the picture.

Solder Pin-2 to Pin-4 and with 10K Preset as given in the circuit diagram.

Next short pin-3 and Pin-9 and solder a wire from Pin-9 to +ve of LEDs as solder in the picture.

Next solder battery clipper wire to the PCB.

Solder +ve wire of battery clipper to +ve Pin of LEDs/Pin-3,9 of IC and -ve wire to Pin-2 of the IC as given in the circuit diagram.

Now we can give audio input using amplifier/aux cable... to this circuit.

{Here I an giving with the aux cable}

Solder +ve wire of aux cable to the Pin-5 of the IC and -ve wire to the Pin-2,4 of the IC as you can see in the circuit diagram.

Connect Battery to the circuit and Plug-in aux cable to Mobile phone and play songs.

As audio level will be of the song like that LEDs will glow.

Thank you