Henners said:
Thanks Hayato
Got the graphics working, No.2 it is.
I'm going to set no.2 up on a breadboard and see how i get on.
Thanks Ron H for the darlington tip
Thanks once again to all for your help
Hello,
Don't forget you need to supply the 4017 with,at least, 12V. That's because you are going to have a 6V loss, when the 9th output is high.
The datasheet says that the voltage output high is VDD-0.05.
Are you going to use 12V lights? How much power they are going to drain? About 100W?
The main thing is that you need high gain darlingtons, because, according to ONSEMI's datasheet, you gonna have only for each output 10mA, so remember, the 9th output will have to drive 10 or 20 darlingtons.
Maybe you gonna need to connect one more transistor to the darlington pairs, to increase the Beta.
Or you could have some mosfets driving the lamps.
Now I'll try to modulate Ron's idea.
You said you need that each pair of lights be turned on every 0.5 secs.
So you need to create 2 circuits one astable, another monostable. (They can made from the 555 IC).
The astable freq. is 2 Hz.
The monostable shot is 5 minutes.
You can do this way:
1 - You connect the astable output to the 4017's CLK (clock) pin.
2 - After that, you connect the monostable output to the 4017's CKI (clock ignore) pin.
3 - Then, you connect the 4017's output #9 to the monostable trigger, the trigger can be a transistor, as the monostable is activated by a negative/0V pulse.
Later I'll try to post the schemactics.