cd4017

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

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!

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

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.
Click to expand...
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!

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

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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