This is the circuit I worked out. It didn't as good as I wanted, but thought maybe someone else might like to try it. The circuit uses a 74AC14 as three seperate oscillators driving a 74AC138 decoder. In my breadboard circuit I used film capacitors and when I built it in a small translucent pumkin with orange LED's I use multilayer ceramic capacitors so I had to juggle on resistor in an oscillator. As it turns out the frequency = 1/(2.0RC).
Here are the connections<p>Connections for 74AC14:
Pin 14 to VCC(3.0 to 5 Volts Plus) Pin 7 to Ground
Pin 2 tied to Pin 3. 2.2Mohm resistor from Pin 1 to Pin 2
0.1uf capacitor from Pin 1 to Pin 4. Pin 4 connected to Pin 3 of 74AC138<p>Pin 6 tied to Pin 9. 6.8Mohm resistor from Pin 5 to Pin 6
0.1uf capacitor from Pin 5 to Pin 8. Pin 8 connected to Pin 2 of 74AC138<p>Pin 11 tied to Pin 12. 3.9Mohm resistor from Pin 12 to Pin 13
0.1uf capacitor from Pin 10 to Pin 13. Pin 10 connectd to Pin 1 of 74AC138<p>Connections for 74AC138
Pins 6 and 16 to VCC(3.0 to 5 Volts Plus)
Pins 4,5, and 8 to Ground.
Pin 1 connected to Pin 10 of 74AC138
Pin 2 connected to Pin 8 of 74AC138
Pin 3 connected to Pin 4 of 74AC138
Pins 7,9 thru 15 connect to cathode of LED's
If all LED are Red,Yellow, Green or Orange tie anodes together and connect 1 resistor
from the anodes to VCC.
Resistor is found by R=((VCC-VLED)/10Ma))
In my circuit I used a 78L05 and a 9 Volt Battery. The 78L05 drops the 9V battery to
5V for the circuit
Ned
