555 led doesnt flash

Thread Starter

ikuus111

Joined Dec 17, 2021
28
555-Timer-Flashing-LED.png
So im trying to make a 555 IC with a led flash but it just stays on at low light
the diagram its like that in the picture but I wired pin 5 with 10nf cap and also used a 12v 1A source with a 100 ohm resistor before pin 8 to reduce current
the capacitors are wired correctly
R1 is 11k , R2 is 20k, capacitor is 10uf, frequency of about 2 Hz
What could be the problem? I'm a complete beginner
 
Last edited:

Alec_t

Joined Sep 17, 2013
13,232
Welcome to AAC!
Try removing the 100R (the circuit will limit the current to what it needs. It won't be anywhere near 1A unless there is a fault) and swapping R1 and R2.
 

ericgibbs

Joined Jan 29, 2010
16,820
hi ikuus,
This 555 simulator shows it working. OK.
E

Check that you have the 10uF electrolytic capacitor in the correct polarity.

EG 1325.gif
 

eetech00

Joined Jun 8, 2013
3,418
View attachment 255371
So im trying to make a 555 IC with a led flash but it just stays on at low light
the diagram its like that in the picture but I wired pin 5 with 10nf cap and also used a 12v 1A source with a 100 ohm resistor before pin 8 to reduce current
the capacitors are wired correctly
R1 is 11k , R2 is 20k, capacitor is 10uf, frequency of about 2 Hz
What could be the problem? I'm a complete beginner
There is obviously a wiring error. Post a good photo's of the actual breadboad taken from different angles.
 

Thread Starter

ikuus111

Joined Dec 17, 2021
28
the capacitors are wired correctly,
the same with different capacitor
how and why to place a capacitor between 1 and 8?
i changed a bit by separating a resistor with cables so it to fits better.could put it back
i can upload photos of the breadboard but around pin 7 cables are very close to each other
if you need another photo i can make one
but arent there some common wiring mistakes?

and i tried to rotate the 555 IC in case its inverted but it didnt the led didnt light at all
 

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