Introduction: VU METER (Part-2) Using LM-3914 & LM-3915

Picture of  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

https://www.instructables.com/id/UV-METER-Music-Vi...

Step 1: WATCH THE VIDEO

Step 2: PARTS LIST

Picture of 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

http://www.ti.com/lit/ds/symlink/lm3914.pdf

Step 4: CIRCUIT DIAGRAM

Picture of 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

Picture of 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

Picture of 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

Picture of 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

https://www.youtube.com/channel/UCZE35bOktFxu8dIad...

Comments

Tominaz (author)2017-04-23

built a couple of these several years ago. I like it when you don't use micro processor for a simple task. great job

KJ ELECTRONICS (author)Tominaz2017-04-24

thanks you

About This Instructable

1,830views

34favorites

License:

Add instructable to: