LFTT (LED Flashie Throwie Thingie)
Intro: LFTT (LED Flashie Throwie Thingie)
You may already know the LED throwies
The LED Throwies are very cool, however they could be a little more attention getting with just 2 extra components.
This Instructable will show you how to make a flashing LED Throwie.
The LED Throwies are very cool, however they could be a little more attention getting with just 2 extra components.
This Instructable will show you how to make a flashing LED Throwie.
STEP 1: Parts List
To make one LED flashie you'll need:
a 10mm LED (I recommend, that you use a diffuse LED. I live in Denmark and the diffuse LEDs aren't available here, so I just used a waterclear type)
a CR2032 lithium coincell battery.
a Neodymium (NdFeB) disc magnet.
a LM3909 LED Flasher circuit
an Electrolytic capacitor (the bigger the capacitor is, the slower the LED flashes. I figured out, that a 100µF works fine. It will flash the LED at approx. 2.5Hz, while a 220µF will flash it with 1Hz.
a 10mm LED (I recommend, that you use a diffuse LED. I live in Denmark and the diffuse LEDs aren't available here, so I just used a waterclear type)
a CR2032 lithium coincell battery.
a Neodymium (NdFeB) disc magnet.
a LM3909 LED Flasher circuit
an Electrolytic capacitor (the bigger the capacitor is, the slower the LED flashes. I figured out, that a 100µF works fine. It will flash the LED at approx. 2.5Hz, while a 220µF will flash it with 1Hz.
STEP 2: Solder the Capacitor Onto the LM3909
Now it's time to Solder the capacitor onto the LM3909 (see all the pictures)
STEP 3: Solder the LED Onto the LM3909
Now it's time to solder the LED onto the LM3909 (see pictures)
STEP 4: Cut Off the Unused Leads of the LM3909
Cut off the unused leads of the LM3909, so they don't short circuit.
STEP 5: Solder Two Leads Onto the LM3909
Now it's time to Solder two leads onto pin 4 and 5 of the LM3909.
STEP 6: Mold It (optional)
You can "mold" the circuit using a hot glue gun. This will make it water proof and shock resistant.
STEP 7: Tape the Battery and the Magnet Onto the Circuit
Tape the battery and the magnet onto the circuit, just like you would do with an ordinary LED Throwie
STEP 8: Throw It!
It's time to throw your LED flashie
49 Comments
zs1apb 15 years ago
yukthi 12 years ago
Artificial Intelligence 14 years ago
zs1apb 14 years ago
These chips have been unobtainable her in South Africa for the last 7 years :-((( Thanks and regards.
robot1398 13 years ago
here is a instructable
https://www.instructables.com/id/how-to-defuse-an-LED/
catman0321 13 years ago
agis68 14 years ago
zs1apb 13 years ago
agis68 13 years ago
porryman 14 years ago
I've read the lm3909 datasheet and with a 1,5 v AA batterie it should be working for at least 6 month.
What could be wrong??
Thank you very much in advance
3unchi 14 years ago
Artificial Intelligence 14 years ago
Speeddemonrs 14 years ago
Artificial Intelligence 14 years ago
willymakesstuff 14 years ago
Artificial Intelligence 14 years ago
buteomont 14 years ago
Artificial Intelligence 14 years ago
samphantom 15 years ago
Artificial Intelligence 15 years ago