Listen to a Led Tea Light
Intro: Listen to a Led Tea Light
Holiday Season is coming. Christmas decorations are everywhere. One of the gadgets that can be found everywhere are led tea light candles that really flicker. They are cheap, clean and not as dangerous as real candles.
But how do they work?
I read somewhere that the flickering was obtained by a sound generating chip hidden inside. I tried and tried to find the original article back, but I did not succeed. So I went shopping and made this instructable. This is not my invention and all credits should go to the person who first couldn't control his curiousity, just like me...
Important: I am not responsable if your experiments go wrong and you ruin your equipment, your Christmas or both. So be careful...
But how do they work?
I read somewhere that the flickering was obtained by a sound generating chip hidden inside. I tried and tried to find the original article back, but I did not succeed. So I went shopping and made this instructable. This is not my invention and all credits should go to the person who first couldn't control his curiousity, just like me...
Important: I am not responsable if your experiments go wrong and you ruin your equipment, your Christmas or both. So be careful...
STEP 1: Gather Materials
What you'll need is:
1) battery operated led tea light (less than 1 euro)
2) either one of following items:
- (computer) speaker
- mp3 player headphones
- audio cable
3) optional: little pieces of metal wire or a soldering iron in order to make the connections
1) battery operated led tea light (less than 1 euro)
2) either one of following items:
- (computer) speaker
- mp3 player headphones
- audio cable
3) optional: little pieces of metal wire or a soldering iron in order to make the connections
STEP 2: Open the Tea Light
In my case I had to do the following:
Remove the battery compartment cover.
With a small screwdriver open the bottom of the tea light.
Gently remove the electronics, it will be necessary to pull out the led from the silicone 'flame'. You'll see the led attached to a printed circuit board (PCB) and the PCB attached to the switch and the batteries.
Remove the battery compartment cover.
With a small screwdriver open the bottom of the tea light.
Gently remove the electronics, it will be necessary to pull out the led from the silicone 'flame'. You'll see the led attached to a printed circuit board (PCB) and the PCB attached to the switch and the batteries.
STEP 3: Connect to a Speaker
Connect the two leads from the led to the leads from a speaker. Be careful not to make a short circuit. If you want, you can remove the led and solder the wires directly to the PCB.
I don't think polarity is an issue in this case, so you can connect the two cables either way.
Now comes the moment of truth: switch on the tea light (at least the remains of it) and listen...
I don't think polarity is an issue in this case, so you can connect the two cables either way.
Now comes the moment of truth: switch on the tea light (at least the remains of it) and listen...
STEP 4: Alternatives
1) Connect to mp3 player headphones
Connect the leads from the led to your headphones.
If you do not want to damage your headphones by cutting the cable, attach wires to the jack. Use the connections 3 (ground) and either connection 1 (right) or 2 (left). I found it more convenient to use connection 1 because of the little notch avoiding the cable to slip off.
2) Connect to your computer, amplifier etc.
Use an audio cable to hook up the tea light to a computer or amplifier. Connect to the line-in plug. I recorded the sound with my computer using audacity.
If you tried this instructable, led me know what sounds you found and enjoy the warmth of the tea lights or their music!
Connect the leads from the led to your headphones.
If you do not want to damage your headphones by cutting the cable, attach wires to the jack. Use the connections 3 (ground) and either connection 1 (right) or 2 (left). I found it more convenient to use connection 1 because of the little notch avoiding the cable to slip off.
2) Connect to your computer, amplifier etc.
Use an audio cable to hook up the tea light to a computer or amplifier. Connect to the line-in plug. I recorded the sound with my computer using audacity.
If you tried this instructable, led me know what sounds you found and enjoy the warmth of the tea lights or their music!
61 Comments
a_traceur 15 years ago
AnZhg 1 year ago
crankyjew 15 years ago
Oncer 7 years ago
Yep - that's the noise my amp makes though higher pitched.I connected it across the power switch just to be an ON indicator and it feeds back into the amp as a quiet tinny dot dot dash dot. See my comment above.
toogers 14 years ago
crankyjew 14 years ago
glynn19 15 years ago
Oncer 7 years ago
In the wayback when I wasn't much good at electronics - not that I'm much better now! - I used a self flickering LED from a similar tealight (but without the PCB) as the power on LED for a bench amp built out of an LM386 and an old speaker. And of course it made noise, a sort of ticking Morse code thing in the background. Not very loud so I could still use the amp for testing but it makes me smile every time I switch it on.
Might be fun to revisit some of these self flickering LED's to see what type of noise toy one could make.
badger4 7 years ago
This is awesome! I had no idea until I read about it in another instructable that links to this one. I used alligator clips attached to the plug of a little battery-powered speaker set (external speakers meant for mp3 players and the like). I did not recognize the tune, but it definitely was music!
Speaking of curiousity, I once put a data CD into my CD player in hope of getting some weird fax-machine-type sounds (no, it did not work, unfortunately). I have to say that if I had found this on my own (with a light microphone, say), I would have been surprised enough to doubt my perception. ;-)
Now I'm going to try it again with earphones and see if I can recognize the tune.
zrickenbacker 8 years ago
This great! I plan on using it as a classroom demonstration.
SugarCluster 10 years ago
Since the melody chip uses pitch of square wave(aka Pulse),it makes LED to rapidly turn on and off,making it look like it's flickering.
Add 1uF capacitor between leads and watch what happens to the LED.
cmccown1 12 years ago
GalaxyX 15 years ago
pooandwee 15 years ago
Jakeg 15 years ago
pooandwee 15 years ago
ReCreate 15 years ago
MadMechanicMike 15 years ago
pooandwee 15 years ago
stormwolf012000 16 years ago