The complete circuit will be placed inside the frog made from plasticine.
This is how the frog will look like in video: http://www.dailymotion.com/video/xxkdl2_blinking-frog_tech#.USCMsB2buro
You will need:
- flashing LEDs
- 9 V battery
- 9 V battery harness
- 470 ohm resistor
- electrical tape
- play dough
Step 1: Assemble the circuit
Connect the anode the positive terminal and cathode to negative terminal. http://en.wikipedia.org/wiki/Light-emitting_diode
Longer leg is always the anode. http://www.sparkfun.com/tutorials/222
The LEDs conduct only in one direction. Thus you will have to flip connections if they are not conducting.
Do not forget to connect the 470 ohm resistor! You will burn the LEDs.
Step 2: Electrical insulation
In the event of a short circuit the battery will become hot and might even explode!
Step 4: Place the circuit inside the frog
Now you are finished.
Again look a the video: http://www.dailymotion.com/video/xxkdl2_blinking-frog_tech#.USCMsB2buro
This is how it should look like.
You can also try parallel connection for LEDs and note the difference in performance. For parallel connection use two 680 ohm resistors for each LED. Alternatively you cannot connect two LEDs in parallel to one 330 ohm resistor.