I came up with this 'thing', which just sits there and blinks, so I'm calling it my 'Blinkie Thingie'. Using just an inexpensive 74HC04 Hex Inverter, it provides a Color wheel or maybe a disco light for small pets.
Step 2: Circuit Design
Construction is minimal - the battery holder and the LED wheel should be finished before tackling the IC.
IC 74HC04 Hex Inverter. Quite easy to find (RShack, eBay etc) but do not substitute!
C1, C2, C3 0.1uF (100nF, 100000pF) capacitor
R4, R5, R6 330-ohm
LEDs x 6 Any color.
I started by cutting the holder in half using snips and a utility knife. The end with the wires I kept together and the other end became another CR-holder.
Leave the plastic walls on the Negative (spring) side so that the Positive end can be trimmed and slipped inside the groove. Apply plastic glue or contect cement and you're done!
The circled letters are LED colors if you are only using Red, Blue and Green. In general, put similar colors on opposite sides - they never light the same time. Connection points are labeled A, B and C. The points with the same letter requires a connection (dotted lines).
Step 5: The IC Chip
Start by bending pins 2 & 13; 4 & 11 and 6 & 9 across the bottom surface of the IC so they touch each other, apply a small amout of solder to hold them together.
This type of assembly is sometimes called 'dead bug' soldering because of the legs-up form. Be careful you don't turn your IC into a real dead bug by overheating it. A good rule to follow is to keep soldering time under 3 seconds at a time, then cool the part by blowing on it for 5-10 seconds in between. It is crucial to have a good heat sink too, like the long-nose vice-grip in the pictures.
Step 6: Finishing the IC Body
The other end of the capacitor should go to pins 5, 3 and 1 respectively. Make sure the wires are clear of each other.
R1, R2 and R3 is now mounted on pins 1 & 2, 3 & 4 and 5 & 6
Attach pin 14 to battery + and pin 7 to - (Ground).
Step 7: The Wheel
Trim off the extra bits, double check for wiring shorts and opens, add power and you now have a Blinkie Thingie!
In some of the videos you may see 3 lit LEDs but it is from the delayed exposure of the camera.