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Making Refinements to the Old Project

I put together the Color Organ Triple Deluxe over a year ago. It was a bare minimum version of color organ circuit using LEDs instead of incandescent lamps that traditional color organs use.

The circuit worked pretty well, considering the simplicity of the circuit. However I just kept feeling like this project deserves further refinements. So I went back to the drawing board (or breadboard) and took a hard look at the circuit...

The result? Please take a look at the video.

Step 1: The Problems & The Solutions

The Problems

There were a few problems. The transistors in the circuit was biased in the way that it was supply voltage dependent, as well as device dependent - in other words, if the voltage was too high or too low, or the transistors had a bit of different characteristics, the circuit did not perform well.
The filter performance was also a bit poor - the separation between the frequency bands were not so great.

The Solutions

First, I changed the initial gain stage from single transistor design to two transistor design. It's a basic class-A common emitter amplifier followed by an emitter follower. They are direct coupled for optimum performance, as well as reduced part count (always important for me to design circuits with the least number of parts). Adding the emitter follower stage allowed the low output impedance needed for the filters to perform well. The biasing circuit was also revised to be less device and voltage dependent.

Second, the filters were refined to have better separations. Input and output impedance to the filters are better matched to achieve better efficiency as well.

Third, the LED driver circuits were given another transistor. Actually, in the original design, the output buffer and the LED driver was done by the same transistors. Now the filter outputs are buffered by emitter followers, then the filtered audio waves are rectified before going into the LED drivers.

Those changes made a huge difference. And I tweaked the component values obsessively to get the best performance. Sensitivity adjustment control is also added.

There are many additional parts compared to the earlier version, but the result is totally worth it. The LEDs now respond to music very, very nicely.

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I made it man. Thanks
<p>This is so awesome I actually built this on my own board(s). Twice. The first time I was using the leftover wires from the components as bridges to other components. This way if you make a mistake, it's a real pain to get it out. So I threw it out and started building the second one. This time, I used thick solder drops on the PCB to bridge nearby components, and bridge wire to join components that are further apart. After fixing some minor mistakes all three color finally started to flash. What a relief!</p><p>Because I had an RGB LED strip laying around, and after some modifications to the circuit using TIP31 transistors I managed to light the strip and the little leds at the same time. I mounted the heatsink to the red channel because for whatever reason it gets the hottest. Basically if you look to the supplied circuit, I connected the Q4, Q6 and Q8 emitters to TIP31's base. My strip is common cathode(1 positive and 3 negative connections for independent colors), cathodes connect to TIP31's collectors. TIP31's emitters connect to ground. That's it. Really simple. There are some photos below.</p>
That is great!<br>I think this is something that many people are interested in (connecting more LEDs). I would be really nice if you can share the schematic.<br>
<p>Sure! Here's the schematic.</p>
<p>Hi there! This build looks amazing and super-compact! I am wondering, do you think it would be possible to connect (or power) three 12V 5050 or 3528 LED strips in place of the LED clusters?</p><p>Much thanks!</p>
<p>any clue?</p>
<p>Same here!</p><p>What changes we need to do to run it with a RGB 5050 LED strip?</p><p>Some people are asking the same, would be so much appreciated</p><p>Thanks</p>
<p>Awesome Project!! but, how i calc the Freq Filters? I need to cut the frequencies, the way it is shown in the picture, these frequencies are of a string instrument. could you tell me how to calculate? or what type of filters are these? because I have not found how to design these filters. thanks! =)</p>
<p>Hi- this looks like a great kit, and I'd love to buy one. However, the only delivery options you offer to Australia are both Fedex and it comes out super-expensive. Any chance you could just put one through the mail for me?</p>
<p>hi ,i am trying to construct the same but with 6 band system can u please explain me that calculation of resistor and capacitor value ..</p>
<p>I've used both this and the original Color Organ Triple Deluxe with students. They work great... especially combined with the MonoBox amplifier on MAKE magazine's website. Thanks!</p>
<p>thanks, get it . I change a little places . lm386+ your ciruit. 9V. Very nice!</p>
<p>I'm in the process of making this as a stereo set, but I want it to use the same power source. What rating would you recommend?</p>
<p>hi, im currently doing your project. i changed the transistor to 4401 and a mono jack instead of stereo. my problem is most of the leds is turned on (reds and blues but dim) with no audio input and it does not respond to the audio</p>
<p>I bought a board and made a few myself but I have been having the same issue with all of them. R20 (47ohm) always blows up! Any hints? I've been using 3904 NPN transistors instead of the 2222 </p>
what is the effect on the LEDs if I turn the variable resistor?<br>
<p>Also, where would the &quot;power&quot; tab be soldered in the stereo jack? thanks :)</p>
<p>Hi, this looks absolutley fantastic, but I was wondering if there was a way to increase the number of leds? I want to build different panels that would house each color. Thank You!</p>
<p>Nice! I've been looking for a project like this. </p><p>A few questions: </p><p>Does this have to run off of 12 volts? I was thinking of mounting one of these in a guitar. (like the old Rickenbacker lightshow guitars did) </p><p>Is the current draw too much for batteries? (I was thinking two 9-volts in series or a 15-volt laptop battery)</p><p>Would I be better off using Version 1 of the Color Organ Triple Deluxe for this purpose?</p><p>Can this circuit use super-bright LEDs?</p><p>Cheers, and thanks for sharing this!</p>
<p>Yes the circuit is designed to use 12V DC, but does work (kind of) ok with 9V. However the 9V battery typically used for guitar box doesn't provide enough juice to run it for practical length of time. 15V laptop battery might be a good option though. Make sure that the actual voltage won't exceed around 16V.</p><p>And yes I used super bright LEDs.</p>
<p>This is what I ended up doing with 2 of these kits. I dedicated each on to one channel (left &amp; Right), Then I used a single input jack and ran wired to each board from it. <br><br><br>I couldn't get my youtube link to load right and run the video so I hade to do it this way</p>
<p>Maybe this</p>
<p>hello everyone, i could use a little advice. I would like to modify this design to be a single channel version. The obvious part i get by simply removing the sections for the mid and highs but in my limited beginner electronics knowledge I'm not sure what needs to be left in between R6 and Q3. It appears to me that R7, C3 and C4 are making up the crossover portion and by removing the will give me the full range audio. Is that correct? Thanks in advance if anyone who wants to put their two cents in.</p>
<p>if you want full range audio, your better off just using a transitor and led and a battery and just having and audio cable go to the transitor and ground. example http://www.instructables.com/id/Blinking-LEDs-to-Music/</p>
<p>I used your color organ deluxe kit II from your website (p.s. that was quick shipping). added my own custom circuit and ended up with water speakers that go to the frequency of the music, the LED's still work too. VIDEO: <a href="https://www.youtube.com/watch?v=C8dNpjotlJk" rel="nofollow">https://www.youtube.com/watch?v=C8dNpjotlJk</a></p>
<p>i need help with the circuit schematic i don't understand the part about 12 v power to </p>
<p>I wish you had a stereo kit. :/ So I just ordered two kits. To make each Kit a single channel (Left or Right) should I use (let's say) Audio 1 on one kit for left and not bother putting in R2 or should I instead hook up left output from my device to both Audio 1 and Audio 2? I am also intending on have the LEDs off the PCB and mounted differently. If I used a small gauge solid copper wire for a few inches, do you think the resistors (i.e. R11 &amp; R11b etc.) will need to be reduced?</p>
<p>I know stereo version would be cool, but I thought you can always use two. I use a splitter cable (found at Radioshack) to divide L/R channels. This cable has stereo jack on one end, and two mono plus on the other end. Mono plugs are connected L and R each. I can't find the model # though...</p><p>As for resistors for the LED, I don't think you need to change the value because even thin wires would only have an ohm or less of resistance at most (unless you run a very long distance, which I won't recommend because of inductance effect).</p><p>Aki</p>
<p>is it possible to add more LED's rather than having just 18?</p>
<p>I tried this project on a breadboard and it works perfectly. Thanks for sharing this idea sir. :)</p><p>But I would like to change the output into a single color LED Strip (12V &ndash; 3A). What would I change or add into the circuit? Thanks.</p>
Hey there I just put this together and I cant manage to get a splitter AUX cable to work with anything to play the music while using the lights... I even tried to connect to a bluetooth speaker and use AUX at the same time and that didn't work... HELP!
Hello :) <br> <br>May I have a question? What kind of transistors should I use to work it with, for example lamps/bigger leds (more powerfull)?
You can try experimenting with larger transistors such as TIP31, but you might have to modify the circuit somewhat. So it might not be that simple. <br> <br>Aki
Hi Ledartist <br>Thanks for posting your circuit. I have built this circuit, but the leds stay on with no audio input. <br>I have checked and rechecked my layout and all is as it should be. I have also cleaned the veroboard of flux. <br>I used KSP2222A transistors and added in a 4th channel, an additional midrange channel. <br>I used 4 Red leds on the low channel, 4 Green leds on the midrange 1 channel, 6 Blue leds on the midrange 2 channel, and 8 White leds on the high channel. <br>Also, I had no line level input, so I inserted a line level attenuator (a 10K and 1K voltage divider). <br>What can be the problem?
Sorry, but it's impossible to tell what's wrong with your circuit.<br>I can be the circuit itself, error in assembly (most likely), or bad parts (like dead transistor).<br>I'd triple check the polarity of transistors, component values, and solder joints.<br>Providing schematics and photos of your board always helps.<br>
Hi. I placed this kit on top of a MonoBox powered speaker as described in Make:Projects and am very pleased with the results. Please take a look at my short video. <br>http://www.youtube.com/watch?v=OboROUJ39DM <br>Great Kit.
Wow that looks nice! <br>Thanks for sharing!
Hi Ledartist <br>This seems like brilliant design and it works well on the video. <br>I would like to have 2 midrange sections by having a &quot;lower&quot; midrange and an &quot;upper&quot; midrange. <br>Could you please tell me the values of R and C for these 2 sections? <br>Thank you <br>Max
Well, through trial and error I figured it out. The 12v connections are labeled on the PCB, no problem. To connect the source, The signal is connected to both holes on the side of the jack drawing on the PCB, while the gnd is connected to the hole in the center of the drawing. This seems to be working fine.
I think you got it right. Sorry I could not answer earlier.<br><br>Aki
Hello. I just finished this kit and it works perfectly. Great separation and brilliance. If I wanted to hard-wire the DC power and the signal source, which holes on the PCB would I use? I'm a good kit builder but I lack in electronic experience. I want to hard-wire this color organ to a mono powered speaker box I'm building for my grandson. Any help would be appreciated. Thanks again for this wonderful kit.
really nice
Hi I've been wanting to buy this kit for a long time now and finally did and it got here yesterday so i soldered it all up making sure to test each led and check the resistors twice and finally after a hour it was done but when i plugged the 12v wall wart[after i made sure it was 12 volts] just the green leds were on and the blue were on but extremely dim. any help would be greatly appreciated and i hope we can get this thing working p.s. i love all of your work
What happens when you connect audio source - Does it react to audio in any way?<br> <br> If LEDs are not reacting, the problem could be so many things... I'd check soldering for bridges/shorts, and polarity of all transistors.&nbsp;<br> <br> Aki<br> <br>
it only changes the green leds very little not a extremely noticeable amount though and the transistors are facing the right way according to the board and there are no solder joints connected thank you though
Im working on an art project to create a wearable visor with an LED array lighting to the sound of music. <br> <br>I have purchased this kit to control the LED's <br>http://www.makershed.com/Color_Organ_Tr ... /mkla3.htm <br> <br>What i want to do is ad more LED's to each channel. At least 15 per column. Im new to resistors and LED wiring and need help figuring out if i need a resistor for each LED (im thinking no) or one large resistor to support the 15 LED's. <br> <br>Will I need to change anything else in this kit to support what i want to do? <br> <br>Thanks! :D
Hey so im building this circuit and i have the first part working well i believe, but i seem to be unable to get the audio signals through the first resistors of any of the actual filters. also the blue LEDs light up as soon as i hook it up to the 12V power supply and dont seem to be dependent on the circuit at all. ive tripple checked all the connections and positions of the actual parts, it just seems like the first resistors (R7,R12,R17) are just keeping anything from passing through them. i did substitute the transistors for 2N3904's. Any ideas on why this would be happening? or how i could possibly amplify the signal before this point?
I want to add some more super bright leds like (led strips), what is the right way to do so ?
Almost done) What voltage LEDs are?

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Bio: I am an electronic artist living in Brooklyn, NY. I work with LEDs and microcontrollers to create beautiful objects.
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