Instructables
In response to music. Use a LED light removed from a pen, lighter or similiar device and a few other components to build it. No soldering involved. This is a simplified version of the blinking LEDs instructable posted here earlier. I shall try to elaborately describe each step so that a person with little experience can successfully build one.

The emphasis shall be on the methods of wiring and testing a simple circuit. The product of this instructable is not the blinking light you build - it is the knowledge that you gain as you build this extremely simple circuit, with materials that are commonly available, with simple tools and very little specialised skills.
 
Remove these adsRemove these ads by Signing Up

Step 1: Take the lamp apart

Picture of Take the lamp apart
Parts: Now that many gadgets come with an LED torch (flashlight) built in, it's easy to just buy one and take apart for the batteries and LED. You have to liberate the torch part from the pen, cigarette lighter or keychain or whatever. You should get three button cells, one LED and some sort of switch for completing the circuit.

The picture shows a pen with built in LED flashlight.

Step 2: Three button cells

The LED torch (flashlight) consists of three button cells and an LED.

The three button cells are visible in this picture.

Step 4: Battery holder, LED and switch

These three components form a module. The switch is a springy piece of metal which makes contact with one leg of the LED when the button is pressed.

Step 5: The switch

Here is a closeup shot of that switch.

The second picture is that of a similiar module removed from an empty cigarette lighter tossed in my path by an unknown benevolent wellwisher. Many thanks to that magnanimous person.

Step 6: Connect wires

Picture of Connect wires
Connect two wires across that switch. The movie shows how you can test it.

The idea is that you connect an electronic switch to these wires and connect the music to it so that it closes in time with the beat of the music.

Then you will have a white lamp which flashes in time to music.
1-40 of 50Next »
domiselomi4 years ago
hey, can you please make a material list??? so i can see what i need to buy
Goalie14 years ago
would 5mm LED lights work for that?
neelandan (author)  Goalie14 years ago
ANY sort of LEDs would work. 
k Thanks!
nhocfun5 years ago
i have tip41c, can i make with it?
pyro-jim5 years ago
Would this work better or worse if you used a small 9v amp before the transmitter?
oops sorry I meant transistor, did you spot it? ;P
elleadnih5 years ago
hey big question if you connect the earphone jack on any music devise the music should mute and only listen on the earphones, right?, why in the video the music is still playing and the earphone jack is in the music devise in this case a pc?
deadfire555 years ago
If anyone wants another link that explains the wiring more.If anyone wants another link that explains the wiring more.
Taotaoba7 years ago
You got a lot of old stuff. Nice instructable! Thanks. If you could put a schematic draft, that would be even better.
neelandan (author)  Taotaoba7 years ago
.
C:\cktdiag.GIF
where in the world did you get all those transistors?!?!?!?
awesome job dude...i tried the flashing lights thingy with my iPod and the lights worked!!!
hmmmm...you think the transistor might be able to amplify sound also?like from an iPod to a Speaker?
nice schematic! i love the hand drawn ones... so scrappy.
me too, but only those drawn by hand and scanned or drawn on computer, but with a kind of anti alias, like blur...
Great! Thanks.
cupnoodles25 years ago
oh i didnt used a resistor does that matters?
Depends on the LED voltage requirement, if you send through 4.5v to a 3v LED it will burn out relatively fast compared to if the voltage was regulated through a resistor.
cupnoodles25 years ago
Hey man thats sweet but my led doesnt go too brighty i dunno y does i need an amp to make it verry bright?
kemical795 years ago
Very exaustive explanation....but...any idea about how it works? ; )
http://www.youtube.com/watch?v=cQaF4bmuojo
MJTH5 years ago
Question, Could you just use a simple relay instead of all this crap? :)
junits15 MJTH5 years ago
the transistor is bascily the same as a relay, just smaller and quieter.
MJTH junits155 years ago
Oh.. I knew that.
junits155 years ago
when I saw you picture with the transistor in it, I noticed that it is an amplifing transistor, that is great for this project because it is way more sensitive to voltage over the collector.
=SMART=5 years ago
LOL did you use a scanner to get those pics ?!!? Awesome !
slimguy3796 years ago
your avi file didn't work for me (I'm using quicktime)
neelandan (author)  slimguy3796 years ago
You aren't missing much. The movie just shows the blinking LEDs and has some music. Next time, I am going to put the movie up on www.blip.tv
Hey nice job. I am gonna make this but i am not gonna use the resister do i just replace it with a wire?
neelandan (author)  Nunavutnewsrules6 years ago
Just leave it out, it might work. If it doesn't, you can try leaving the earphone in circuit (in place of the resistor).
awkrin6 years ago
nice idea, but I was very impressed with the high quality, really close pics
urbosssez6 years ago
w00t mines works! but my transistor sucks so it only works well with my rbg leds but atleast it works! thanks A TON for this instructable very clear and simple!
worleyll6 years ago
If you have a large stereo you can just hook the lights straight up to the speaker wires.
Zujus6 years ago
Awesome! Simple and nice for starters ;)
bignothing6 years ago
Any idea on how many of these I could wire to an amplified signal before the effect lessens noticeably? Or would it make more sense to wire multiple leds to one transistor, and then fiddle with the resistor? I'm trying to figure out the simplest way to have 4-6 sound-blinky leds on the front of my guitar amp.
Joe4266 years ago
Awesome, i did this and it worked great! - i used a TIP31 NPN Transistor - Radio Shack.
Hawaii000006 years ago
Maybe i could use a mic to make it more portable.
neelandan (author)  Hawaii000006 years ago
No. The signal from a mic is not large enough.
I know but if it were attached to somthing like this.........

http://www.amazon.com/SPY-EAR/dp/B0006GKFZ8 (Its a little toy that is supposed to amplify sounds amd uses a headphone jack)
Hawaii000006 years ago
I f you don't know how many ohms your resistor is go to http://www.the12volt.com/resistors/resistors.asp
1-40 of 50Next »