555 timer issue

[nicksydney]

Pin 7

[andtfoot]

It looks like you have gotten yourself confused a bit.
Looking quickly, I can see that the connection for pin 7 is in the wrong spot. It is meant to be between R1 and R2, not where R1 should be connecting to +V.

I have just quickly chucked together the circuit that you posted on a breadboard here and it works fine for me (the only change was a 2.2uF capacitor, because I didn't have a 1uF). Here are some photos (sorry for the blurry phone pics):

[rexxar]

Here, maybe this will help.

[Fluxed Matter]

The component that I'm using and the connection

Pin
----
1 - GND
3 - connect to a LED and the LED to GND
4 - connect to to 8 and 4 also connect to GND
5 - connect to a C1 and than connect to GND
6 - connect to R1 that connect to R2 which connect to Pin 7 and than R2 connect to C2 which connect to GND
8 - connect to +


Battery I'm using 9v but when I tested it with multimeter it was reading 7 something volt

Check your connections again. Pin 4 indicates its connected to pin 8 and GND, and then down below you show pin 8 connected to +V. Basically your shorting power to ground.

Use rexxar circuit. It should work for you just fine.

[nicksydney]

Hi andtfoot,

Thanks for the pics. Do you mind taking a clearer one so I can compare with mine as no matter what I do it's still not flashing.
Cheers

It looks like you have gotten yourself confused a bit.
Looking quickly, I can see that the connection for pin 7 is in the wrong spot. It is meant to be between R1 and R2, not where R1 should be connecting to +V.

I have just quickly chucked together the circuit that you posted on a breadboard here and it works fine for me (the only change was a 2.2uF capacitor, because I didn't have a 1uF). Here are some photos (sorry for the blurry phone pics):

[andtfoot]

Hi andtfoot,

Thanks for the pics. Do you mind taking a clearer one so I can compare with mine as no matter what I do it's still not flashing.
Cheers

No worries. I have taken some more, but instead of filling the thread with giant pictures here is a link to the gallery:

andtfoot.smugmug.com/Electronics/555-Timer/36223656_T97vTV

If you hold your mouse cursor over the picture, a bar will popup on the right that allows selection of a larger size.

[Joule Thief]

this is a little rough but the bird's eye view might be helpful.

[nicksydney]

Finally! I've fixed the problem. The issue is got to do with the 555 IC, it's faulty  , after changing to another 555 timer with same model it works. The LED is now blinking 

Thank you to all that has helped me diagnose this problem. Lesson learned here make sure you have backup of any of the components that you are using in case of faulty issue.

Here is a video to share with you all the result http://videopasteus.s3.amazonaws.com/videos/21b3f11afd864c1fb0f736baca430dc1.html

Cheers

[Rigby]

Did your incorrect wiring botch it up at some point?

[nicksydney]

I think so I'm not really sure to be frank. It could be that or I use a different power source and didn't pay attention too much about it.

Did your incorrect wiring botch it up at some point?

[Joule Thief]

Good to see everything worked out. The 9 volt battery can still provide a bit more learning opportunity.

Devise a simple experiment for battery terminal voltage versus current output and solve for the approximate equivalent series resistance inside the battery itself. You will become familiar with the concept of ESR and discharged batteries.

Once the ESR experiment is finished... take the battery apart. Observe the construction and materials used.
Tear everything apart before before it leaves your bench for the trash can!