leocon11 Posted April 9, 2011 Report Share Posted April 9, 2011 can someone help me to design a blinking LED's which contain 6 branches which has the following numbers of LEDs for each branch: 1st branch = 13 LEDs 2nd branch = 10 LEDs 3rd = 8 LEDs 4th = 12 LEDs 5th = 5 LEDs 6th = 14LEDsi try to use a astable 555 timer but the intensity of the output of the light are not equal for eacg branches.., attached here is a "livewire" file that i used for simulation.... tnx for response if any..., tnx.., good dayblinkingLED.rar Quote Link to comment Share on other sites More sharing options...
Hero999 Posted April 9, 2011 Report Share Posted April 9, 2011 I don't have Livewire so I can't view the schematic.You'll get more help if you post the schematic in a format which everyone can read. Quote Link to comment Share on other sites More sharing options...
leocon11 Posted April 16, 2011 Author Report Share Posted April 16, 2011 i have a .jpg file here attached..., can u please see it..., i need help badly.., tnx Quote Link to comment Share on other sites More sharing options...
Hero999 Posted April 16, 2011 Report Share Posted April 16, 2011 Why have you got a battery with the voltage set to 0V wired in series with a 24V battery?The intensity of the LEDs is not the same because the current flowing through them is different. Google for the formula to calculate the series resistor for the forward current you desire.The 555 timer has a maximum voltage of 15V to 18V depending on whether it's TTL or CMOS so won't last very long running off 24V. You could use a voltate regulator to power the 555 but that would mean it couldn't switch the PNP transistor off. There are other circuits which can flash LEDs alternately and can be powered directly off 24V, e.g. an astable multivibrator built from a couple of transistors, see Wikipedia lnk below.http://en.wikipedia.org/wiki/Astable_multivibrator Quote Link to comment Share on other sites More sharing options...
leocon11 Posted April 19, 2011 Author Report Share Posted April 19, 2011 dont mind that 0V battery sir.., its just an error...one question sir..., can a 9V battery can actually light up the entire LEDs??? or just stick to 24v DC??? Quote Link to comment Share on other sites More sharing options...
Hero999 Posted April 19, 2011 Report Share Posted April 19, 2011 It depends on the 9V battery, a little PP3 battery isn't large enough to provide enough power for very long. Quote Link to comment Share on other sites More sharing options...
einstein0 Posted June 25, 2011 Report Share Posted June 25, 2011 Use a programmable counter (4017/4029), instead of a 555, with an appropriate driver for each branch.einstein0 Quote Link to comment Share on other sites More sharing options...
gogo2520 Posted June 26, 2011 Report Share Posted June 26, 2011 the cd 4017 needs a clock to make it work, could use a 555 for thatgogo Quote Link to comment Share on other sites More sharing options...
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