VU Meter With LED Strip

Hi all,

For Christmas this year, I made simple decoration using LED Strip.

Hope this can inspired you .

Require parts :

• LED Strips
• Some Cables
• IC lm3915
• PNP Transistor, w/ rated current depend on your LED Strips
• Variable Resistor to adjust level and brightness
• some resistor

Before you use LM3915 for your purpose, it better to read the datasheet..

http://www.ti.com/lit/ds/symlink/lm3915.pdf

there you will get more information or schematic .

I build the circuit using protoboard PCB, please check this out

http://instagram.com/p/woG0EWsXuX/

When I have checked the schematic and works, I will modify the circuit for my purpose.

revision history :

• adding Terminal block for input/output because it's universal and simple
• Replace fixed resistor with Variable resistor
• adding Transistor BD140

I am using Led Strips with 30 Leds on that, and it require around 520mA so I need transistor to handle that, and choose BD140 for that. BD140 can handle 1.5A and 80V.

Check this datasheet http://www.elektronik-kompendium.de/public/schaere...

For transistor schematic, do not put high resistor on base, I am using 20 Ohm for my board

For Harness , I using LAN cable because it have 8 cores, so it make more quick and clean for the installation.

if I using single core cable , I need around 80 meters , but when using LAN cable , I just need 10 Meter.

test the circuit to calibrate the level.

and enjoy !

Feel free to asking me about this project ^^

Thank you !