Green Blinkenlight: Creating a Simple Clock Circuit with a 555 Timer
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- เผยแพร่เมื่อ 7 พ.ย. 2021
- We create a clock circuit with a 555 timer in astable mode, and use it to blink a green LED.
blinkenlight, noun
- A flashing light or beacon light
- A status light on a electronic or electric device such as a modem, router, network hub, and so forth
[via Wiktionary]
#ElectronicsCreators
Oh my god thank you! I tried everything and then noticed that the 555 timer was the wrong way
Thank you!! Excellent video
Thank you very much. Very clear and organized presentation
thankyousomuchh
Hi
Sorry for the stupid question.
I manage to let this work on a breadboard.
I didn’t have exactly the resistor and the capacitor but I managed to find the right stuff.
So I tried to put on a strip board but I’m noticing something weird.
I didn’t use the small capacitor that you used but it was fine on the breadboard.
Consistent light and good range of oscillation.
On the strip board the led emit a really low light before actual blink, I can notice when it’s really slow.
As I said on the breadboard don’t happen but I copy the same circuit.
Any help?
Thank you
Something my dad told me, i had an issue with a circuit i made and he told me to put a large-ish capacitor (maybe 1k/2.2k ųf which is what i use) between the supply and the entire circuit. Suddenly, the effects of what i got from my breadboard is happening on the circuit board, which is what i wanted. Try that, maybe you just have a current shortage and need more available current, idk but good luck though
nice detailed video, do you take on design jobs - need a pcb board designed
Can't help with a pcb design, I'm just learning the basics, but thank you!
L
oooo nice pen
Can someone pleas explain this to me? For weeks, I have been trying to get this circuit to work: setting it up in this *exact* manner. But, the discharge never occurs. The output will get stuck low, but the capacitor will never discharge. Is it possible my IC is damaged somehow? i have tried just about every possible configuration, using a physical RA and RB, using a potentiometer to represent both, using an electrolytic cap instead of a tantalum one, but the exact same thing always happens: Output goes low, cap voltage charges all the way up to Vcc. I know it must be some issue with the path from the Cap through Rb to discharge but I can't figure it out.
Also make sure your IC is the right way.
What is the ceramic capacitors value?
I am trying to remake it but I think I have the wrong compacitors
Looks like a 1uF cap connected to pin 5 instead of the 0.01uF recommended, and it's connected to Vcc instead of ground. The decoupling capacitors I used are 0.1uF. These are just capacitor values I had lying around that seemed to work. If you know how these values should be chosen let me know.
@@IanWard1 may I ask why did you connected it to Vcc if the datasheet specifies that it must be connected to ground?
@@cesarhuerta9632 connecting to Vcc was just an accident that I didn't notice until editing the video. Seems to work fine either way, though so I've left it.
1:03 Building the Circuit
This video series assumes an understanding of basic digital electronics. Ben Eater's videos are great to start with if you need to brush up on the basics th-cam.com/play/PLowKtXNTBypETld5oX1ZMI-LYoA2LWi8D.html
Also check out this great video with lots of background on the 555 chip from ScienceOnline th-cam.com/video/4yy_Wk8zoyE/w-d-xo.html
what is the clock time?
there is a formula for it it depends on the resistor and capacitor that you used
what is the value of Ra and Rb
I used Ra = 220 and Rb = 10K for this circuit
the video is great, though i think your voice could be a bit louder
what the voltage???
I'm using a 5V bench power supply for this project
using 3 ceramic capacitors, is just a waste of money.