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usb e kits presents
color organ
V2

functionality

A very cool 2 channel Color Organ kit! Lay back and watch Leds dance on the music!
5 green leds for the low frequencies (bass) and 5 blue leds for the high frequencies (treble)
The kit is based on a quad amplifier (LM324).

Just drive an audio signal of an analog output (e.g. soundcard) direct to the audio jack of the kit.

Use an audio splitter if you have only one output.The cable can be both mono and stereo.
The audio signal now is ready to travel through the opamps.

The 2 first opamps of the LM324 are active filters that separate the low and high frequencies.
The other 2 opamps are amplifying the separated signals separately. With two potentiometers you can adjust the amplification to the level you want accordingly to the input audio signal strength.

Now the new signals trigger 2 npn transistors (2N3904) ,one for the low frequencies

and one for the high frequencies.The transistors drive the green and blue high brightness straw hat leds!

After your feedback from the first version we made some improvements

please leave your feedback for the kit or your suggestions for more improvements in the future

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V2 release improvements

1) Reverse polarity protection
2) Redusing the noise in the nets with better pcb wirrings and adding capacitors above the chips.
3) Bigger pads for easier constructions
4) Better placing of the components for easier constructions
5) The on off switch now is extended from the pcb so you can mount it in your project box
6) More leds per channel for more intensity and better placing for better optical results.
7) Ability to place the led on the bottom side so you can hide the rest of the structure.
8) The trimmers are now extended from the pcb board so you can mount them in your project box.
9) Bigger heat sink power plates for better heat consumption.
10) A bigger amplification of the  audio signal.
11)Better seperation of 2 channels.

Update v2.2

I've changed the values of the resistors R11 , R12 , R6.
This is for the amplification level of the signal.
I think that the previous values offered bigger amplification than we wanted.
So now we have more flexibility with the audio levels of the signal.
Also i added an extra resistor to the circuit exactly on the audio input connected from the signal direct to the ground.
This now the green leds will not turn on when the audio jack cable isn't connected...
New values: R6 =10K , R11=4,7K , R12=10K , R14 = 1.2M

the circuit schematic

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color organ schematic

part list

Ref.        Type                                        Value
C1        Ceramic Capacitor          330nF
C2        Ceramic Capacitor          100nF
C3        Ceramic Capacitor          10nF
C4        Ceramic Capacitor          10nF
C5        Ceramic Capacitor          100nF
C6        Ceramic Capacitor          100nF
C7        Ceramic Capacitor          100nF
C8        Electrolytic Capacitor   2,2uF
C9        Electrolytic Capacitor   22uF
C10     Smd 0603 Capacitor     100nF
D1        Straw hat LED                    Blue
D2        Straw hat LED                    Blue
D3        Straw hat LED                    Blue
D4        Straw hat LED                    Blue
D5        Straw hat LED                    Blue
D6        Straw hat LED                    Green
D7        Straw hat LED                    Green
D8        Straw hat LED                    Green
D9        Straw hat LED                    Green
D10     Straw hat LED                    Green
D11     Diode                                      1N4001
D12     Diode                                      1N4148
D13     Diode                                      1N4148
D14     3mm difused led              Green
FU1     Fuse  glass   20mm          300ma
J1         Usb jack                                  Type B
J2        Terminal Block                     2 pin Dc input
J3        Audio jack                              stereo Audio input
SW1   jst 2 pin connector           ON/OFF Switch
U2      Voltage Regulator            7805
Q1       NPN Transistor                  3904
Q2       NPN Transistor                  3904
R1        Resistor 1/4 watt              470
R2        Resistor 1/4 watt              10
R3        Resistor 1/4 watt             1,2k
R4        Resistor 1/4 watt             2,2k
R5        Resistor 1/4 watt             1k
R6        Resistor 1/4 watt             10k
R7        Resistor 1/4 watt             150
R8        Resistor 1/4 watt             10
R9        Resistor 1/4 watt             5.6k
R10     Resistor 1/4 watt             5.6k
R11     Resistor 1/4 watt             4.7k
R12     Resistor 1/4 watt             10k
R13     Resistor 1/4 watt             150
R14     Resistor 1/4 watt             1,2M
U1       Quad Opamp                      Lm324
RV1    jst 3pin cable                       Trimmer       50k
RV2    jst 3pin cable                       Trimmer       50k

construction help guide

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resistor color code definition
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2n3904
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SPDT switch
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1N4148
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LM324
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LM7805
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LED
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jst 2 pin female pcb mount
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jst 2 pin male cable
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jst 3pin 2.5 pitch for trimmers

Stereo audio
jack datasheet here

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Standard 5mm pitch terminal blocks
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click for soldering and prototyping assistant


downloads

color_organ_v2.2_datasheet.pdf
File Size: 155 kb
File Type: pdf
Download File

merged_color_organ__v2_pcb_files.pdf
File Size: 937 kb
File Type: pdf
Download File


how to drive one channel of your soundcard output to the kit

Split your audio signal

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If your soundcard doesn't have more than one output you can split the audio signal with a simple audio splitter!
So you can here the music while seeing the leds dancing!
If you have more than one outputs you can take one free output directly.


Use a male to male audio stereo jack cable.

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        Now simply drive the cable from spliter or soundcard
        directly to the female audio jack of the color organ kit.
       

Troubleshooting

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If you cant see the leds dancing one of the following may be the cause:
The audio signal is too week-->Increase the volume of the device
The audio signal is good --> Adjust the sensitivity of the trimmers


Choose the way you want to operate the kit!
Use it as a dancing lamp

or as concealed lighting color organ!

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Watch your led dance on the music
or on the sounds of a film!


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