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!