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Im building a coffee table that i wanted to have lights that would sync to the music i was playing or the games i would be playing. Did some research and found this was the best way to do (coffee table will be a later instructable).
Materials:
- 1 x TIP31 NPN Transistor - Radioshack # 276-2017
- 1 x 1/8" Audio Jack - Radioshack # 274-0249
- 1 x Toggle Switch (i used a covered one because i thought it looked cool, but any will work) - Radioshack # 275-601
- Roll of LED lights (or whatever you plan to use for lights) These are the cheapest i found and they included a power supply
http://www.amazon.com/gp/product/B00B0U9IAM/ref=oh_details_o01_s00_i00?ie=UTF8&psc=1
- Breadboard

Here is video of them in action

Step 1: Build the circuit

I built mine really small so i could fit it in the case but you could make it bigger so all the wires arent jammed together.
Cut a piece of breadboard to the size you want to build your circuit on.
You will also need to desolder the 12v end from the LED strip to be able to wire it into your circuit.
Wire two leads onto where you remove the 12v end from
My question is if the audio comes through a headphone jack on the device, how does the device still emit sound?
<p>you use a headphone splitter, so you can run one to the lights and the other to your speakers</p>
My question is if the audio comes through a headphone jack on the device, how does the device still emit sound?
My question is if the audio comes through a headphone jack on the device, how does the device still emit sound?
My question is if the audio comes through a headphone jack on the device, how does the device still emit sound?
<p>Hello , i just went to a local electronics store , i asked for TIP 31 Tranzistor , she gave me a equvalent to that . I went home , i did the ciruit , and nothing is happening .... Why ? Do it really needs to be a TIP31 or i can use a equvalent to that . But a TIP31 B or C is working ? Pleaseee answer fast :)</p>
<p>Would it not be possible/reasonable to connect both left AND right channels to the transistor? That way if you didn't want to do two colors of lights both channels would go through the one?</p>
<p>Yeah it would be possible, it might just muddy the signal so you not get as clean of light changes.</p>
a video will be appreciated :)
there is a video on the first page
thank u for mailing the link to the video :) <br>nice project indeed
there is a blank space and no video is visible , can u please give the link of any site it is uploaded on ?
heres the link <br>http://www.youtube.com/watch?v=Qq6EFpZBaEs
Hi <br>I am relatively new to this <br>I followed your circuit exactly but nothing happens <br>Do u know what my problem might be <br> <br>TNX
Sorry other comment was not clear. What i was trying to ask was if the leds do not come with a power source like the ones you used would i be able to use a 12v source from something else and still connect it the same way you did here???. Sorry if i was confusing.
Yes a top view would be good also just wondering if the lights do not come with a power source would i still do it the same way as you did with the adapter??
hey im new to this whole thing of circuits and just starting out. I have tried out a few instructables and have done well for a beginner. I was wondering if you had a better picture of how everything went together or if you could explain a little better to me.
i can take some pics of whatever you want. do you want a top view of the circuit or something?

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Bio: I am a Junior in college studying Mechanical Engineering. My interests include woodworking, 3D printing, electronics and building computers
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