LED is not flashing using 555

[popkutty]

I've used the circuit of https://3.bp.blogspot.com/_RpOfkmvm...dlFi0/s1600/555+timer+bi-stable+operation.jpg

R1=1K
R2=10K
C=100uF.

It's continuesly output is High. It's not flashing. I gave 4.5V as Vcc.
What's the problem for this?

 

[ericgibbs]

hi,
It could be any number of problems, eg:
The 100uF polarity is reversed.
The 555 is incorrectly wired, etc

Please post a clear picture of the project so that we can check your connections.

 

[orbiter]

Check the GND on pin 1?

 

[4pyros]

You may need more than 4.5 volts supply, thats right at the min spec. Try 5 volts.

 

[popkutty]

https://www.facebook.com/photo.php?...103378739834.2015712.1087701578&type=1&ref=nf

Here is my circuit Mr. Eric Please check and say...

 

[ericgibbs]

https://www.facebook.com/photo.php?...103378739834.2015712.1087701578&type=1&ref=nf

Here is my circuit Mr. Eric Please check and say...

hi,
Checked your circuit photo, its wired all wrong, its possible that the 555 is now damaged.

I will post you a new circuit later.

This image is the circuit you posted.

 

[Boncuk]

I have simulated the original circuit and it works like a charm.

Check your pin count. Something is very wrong with it.

IC pin count starts at pin1. Left hand bottom pin and follows to the max pin number in an anticlockwise pattern.

So if pin1 is at left hand bottom pin8 must be at left hand top.

You obviously fried your chip. Time to use another one and do it right this time.

Boncuk

 

[4pyros]

Looks like the pins on the right hand side are wired upside down. Power should go to pin 8 not 5. You should put a cap on pin 5.
Andy

 

[ericgibbs]

hi,
Try this very simple layout, as I said earlier the 555 maybe faulty.!

 

[popkutty]

Oh god. Thank you Eric and Boncuk. I were wrong in pin Count. I'm very beginner to Electronics, Thank you Eric for the Circuit...

 

[popkutty]

Can you please tell me, from which software I can simulate electronic circuits.?

 

[popkutty]

Thank god. My IC is not damaged. Maybe I gave only 3V for wrong connection. Thank you Eric, The circuit you gave i used. It's working. I happily finished my first project... Huhuhu...!

 

[ericgibbs]

Can you please tell me, from which software I can simulate electronic circuits.?

hi,
Well done.!
Look thru these free sims.
https://www.google.co.uk/search?q=e...s=org.mozilla:en-GB:official&client=firefox-a

 

[4pyros]

Thats awesome. You now have the bug!

 

[DerStrom8]

Alas, he was unable to witness the true power of the magic smoke, but I am glad he got the circuit working

 

[Ziddik]

i see magic smoke everyday lol

 

[popkutty]

Hey guys, I found one thing, I did Monostable from 555 and I just touch the Triger, it turns on the LED, I continuesly touch the Trigger what a magic..! The monostable working as astable, LED is blinking, how's it possible...?

 

[4pyros]

Keep your finger off it. You keep trigering it.

 

[popkutty]

Ya, how's it happening.? By this, we can do touch sensor I think...

 

[4pyros]

Your skin can effect sensitive circuits.