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.
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