i purchased 20 ne555p ic , i inserted it how come my leds are not blinking they just still please help.

the cd4017be chip has a small line in the middle like a crack marker but working , the reason i know its working cause if i take the cd4017be out then the leds dont power up.

i only connected 1 led to the middle connector , do i need to connect all 3 leds to the board could that be the problem or not

any suggestions plz

 

First you need to figure out if the 555 is pulsing

 

i purchased 20 ne555p ic , i inserted it how come my leds are not blinking they just still please help.

Is the timer working correctly?

the cd4017be chip has a small line in the middle like a crack marker but working , the reason i know its working cause if i take the cd4017be out then the leds dont power up.

That's not a foregone conclusion. Make sure the clock is toggling. Is only one output on at a time?

i only connected 1 led to the middle connector , do i need to connect all 3 leds to the board could that be the problem or not

How can we know? You haven't posted a schematic or sufficient information for us to know what the connectors are for.

 

I agree. Without further information, my crystal ball says the answer is "Maybe".

 

the shematics and post are in page1 of this post.

also i have 20 ne555 ic i only tested one , the leds light up but not blinking.

 

Your circuit should pretty much look like this:


You obviously have something in there backwards. The 555 is just running as a astable multi-vibrator or simply put an oscillator. It drives the CD4017 counter. This is as simple as it gets. Something is in there backwards or the wrong component in a wrong place. This circuit even runs in a simulation.

Ron

 

can u check the first post sir u can se my snapshot everything is in place.
i can only have doubts about the resisters near the transistors ? change them around oposite way?

 

i switched nothing still same.
i suspect the cd4017be is gone bad may need new one , the theird connector gives low output on led i traced it and seen it goes to the cd4017be pin

il have cd4017be orderd and then se what happens am 100% sure its that.

 

place the resistors any way you want, won't make a difference.

 

What part do you not understand.
Check the 555, is it toggling or not ?

 

how do i check if its toggling or not please tell me and il check it thanks and sorry for the trouble , am just here learning much as i can.

the cd4017be has little crack line in middle but the leds are lighting up and not blinking , maybe cd4017be got fried in previous over-heat attempts. ?

is that it

 

i can only have doubts about the resisters near the transistors ? change them around oposite way?

What do you mean by "around oposite way"? Turn them end for end? Resistors have no polarity. That would do nothing, unless in turning them around, you inadvertently correct a bad soldering job.

 

Connect a led through a 680R resistor is series between pin 3 of 555 and ground.
If the 555 is working you should see the led flashing

 

Connect a led through a 680R resistor is series between pin 3 of 555 and ground.
If the 555 is working you should see the led flashing

...if the frequency is low enough

 

ok thanks i will try.

here is what i made in software using this shematic image above.

and it show its works and stays on ,its working good.

testing on software not blinking , am i doing wrong

 

I am talking about the circuit tht u soldered.

 

ok did what you asked here is what has happen.

the led lights up but in way not sure if it blinks or not cause it has this little effect to it like its blinking but not to sure , its like its blinking so fast u cant tell if its steady light or fast blink, its un-noticable rate.

is this what am looking for ? or am i looking for slow blink ever 3 seconds ?

 

is this what am looking for ? or am i looking for slow blink ever 3 seconds ?

Instead of coming running to us every time you have a tiny little question, try figuring it out for yourself: download an NE555 data sheet and look at the section where it discusses the 555's astable multivibrator mode. Take the component values for your circuit (see post #26 above) and plug them into the formula for frequency (formula 4 on page 11), and calculate the frequency yourself!

There is no need to be peppering us with every little question you have; show some initiative and start thinking for yourself and figuring things out for yourself. Otherwise, people here will quickly run out of patience, and eventually stop helping you.

 

this led kit module i purchased should work strait away how ever i messed up fried 1 ic ne555 and also the cd4017be has small buldge and crack on top ,maybe something from that ic cd4017be preventing it to work only way to find out is get a new cd4017be and check it then investigate further later.

by the way here is what you mean to change frequency
http://houseofjeff.com/555-timer-oscillator-frequency-calculator/
i checked the legs of the 555 it goes to cd4017be , so i may need to change cd4017be and re test

 

...and also the cd4017be has small buldge and crack on top ,maybe something from that ic cd4017be preventing it to work...

A bulge and a crack on top? Then the CD4017 was fried, too.

...only way to find out is get a new cd4017be and check it then investigate further later.

Before you try it out with a new 4017 and a new 555, power up the board with no chips installed and use your voltmeter to check the voltages on all the IC pins to see if they're what you'd expect. Then, if the voltages are OK, turn off power, install the chips, and power it back up again. (NEVER install or remove chips with the power on!)