Introduction: VU METER (Part-2) Using LM-3914 & LM-3915
This is the second part of the music visualization series and in the video above i have shown how you can make a simple VU meter by using the ic called LM-3914 or LM-3915.
The part 1 is basically about how you can make the simple and cool looking VU meter by using the arduino microcontroller link to that is given as
Step 1: WATCH THE VIDEO
Step 2: PARTS LIST
To make this cool looking UV meter we need these following things
1.LM-3914 IC
2.Breadboard
3.Copper dot PCB
4.18 pin IC Holder
5.Resistor(1.2k & 4k ohm)
6.Potentiometer (1K ohm) & Knob
7.Audio jack
8.Dc jack
9.LED (6-Green & 2-Blue & 2-Red)
10.some connecting wires
TOOLS REQUIRED
1.soldering iron
Step 3: SPECIFICATION OF LM-3914 & DATASHEET
When looking at the LM-3914 ic datasheet these are some important features i found that i am writing here
Power Dissipation PDIP (NFK) == 1365 mW
Supply Voltage == 25V
Voltage on Output Drivers == 25V
Input Signal Overvoltage == ±35V
Divider Voltage == − 100 mV to V +
Reference Load Current == 10 mA
Storage Temperature Range == − 55 °C to +150 °C
If you want to have a look at the full datasheet of this ic you can go the following link
Step 4: CIRCUIT DIAGRAM
After lots of test on the circuit which is provided in the datasheet i have recreated the circuit which is present above
The basic pin diagram overview is given as
LM-3914 Pin
1- led 1
2-GND
3-VCC
4-GND
5-AUDIO SOURCE
6-POTENTIOMETER
7-TO RESISTOR
8-GND
9-VCC
10 TO 18 -LED's
Step 5: CREATED CIRCUIT ON BREADBOARD
To test the circuit above i have created the circuit on a sloderless prototype board or simply the breadboard
Step 6: FINAL CIRCUIT PCB
After testing the circuit on the breadboard we can implement it on the PCB .
you can follow the instructions provided in the video above and get the basic idea that where to place the components and how to connect those
Step 7: ADDING THE MUSIC SOURCE
After all these steps have been done at the last we can add the music source
And the music can be from any device like a smartphone or pc or laptop or i pod
i am using a audio jack spliter in the same way as i have used that in the part 1 or this music visualization series
the one end of that spliter will go to the headphones and the other one will go our circuit as shown in the picture above
Step 8: THANKS FOR WATCHING
Thanks for visiting the following instructables
If you like the project make sure you give a like you can visit to my youtube channel and get so many similar projects by clicking the youtube link below