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cd4017

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littletransistor said:
Okay - I found the nearest, and the most simple CD4017 system ever - it's in the link:

**broken link removed**

Must i put the 0.1uf cap to the supply like that? :)

The webpage about this one is from: http://www.kpsec.freeuk.com/projects/heart.htm

Yes, always have some decoupling capacitors on your pcb, its good engineering practice, it will save you lots of aggro!:rolleyes:

IF the +V supply is a small battery, also fit a 100uF 16V across the supply rails.
 
ericgibbs said:
Yes, always have some decoupling capacitors on your pcb, its good engineering practice, it will save you lots of aggro!:rolleyes:

IF the +V supply is a small battery, also fit a 100uF 16V across the supply rails.

If it's ANY battery you should do so, and also for mains powered units.
 
Roff said:
It can be even simpler. You only need one resistor for the LEDs.
You don't need a current-limiting resistor when a CD4017 has a 9V supply.
The output current into a 2V LED is only about 14mA and the power dissipated is only 98mW. The max allowed dissipation per output transistor is 100mW when the ambient temperature is 100 degrees C and the allowed dissipation is higher at lower ambient temperatures.
 
ericgibbs said:
Yes, always have some decoupling capacitors on your pcb, its good engineering practice, it will save you lots of aggro!:rolleyes:

IF the +V supply is a small battery, also fit a 100uF 16V across the supply rails.

Thanks man, it works pretty well with the decoupling cap I put inside the 555 astable system. Man.. my breadboard is kinda weird, it has too loose contacts, no wonder my running lights isn't working. Time to get some new breadboards. :)

Anyway, that's a precious engineering tip! Great work! :)
 
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