Definition of a TRUE engineer.... Someone who can achieve the same objective as another "engineer" using less time and money. You've earned another sub! Also, is there a simple way to make the LED fade in and out rather than switching on and off with the square wave? I guess a triangle wave would work well for this. The limited bit of electronic knowledge I have makes me think of attaching an electrolytic to the LED in some way. When my breadboard arrives, I'll fiddle and see if this works. Maybe cap between anode of LED and ground. If I had my breadboard, I'd not have to ask this!!
I use this circuit since 40 yearsm because of its simplicity. But you cannot expect to get a duty cycle of 50% with the NE, SE and LM version of the 555 timer due to the fact, that the output stage of these timers is not rail-to-rail. So I used the CMOS versions like the TLC555 or the LM7555 because of their real symmetrical output stage instead. For the LM7555 you need to considerm that the voltage divider is not 33%, 67% but 25%, 75%. So the time constant of this device is considerably longer. You have to use another formala to calculate it. but considering the fact you get just other R, C values for the same frequency. It is also easy to change the duty cycle for a certain frequency by using a potentiometer and two diodes to separate the charging resistor from the discharging resistor. If you need higher linearitiies you can implement two current sources instead of two resistors and diodes. In the simplest representation you can just substitute the resistor by two anti-serially connected constant current diodes.
While I wouldn't use it for something very precise, it'll make a good clock signal for my LED chaser while saving a bunch of wiring and space. Thank you.
another sub for this, this is sooo much simpler than what i was doing with two potentiometers and trying to get a 50% duty cycle, could get close but not exact
Do you mean just low frequency, or high duty cycle, where the LED stays on way longer that it's off? If you just want low frequency you only need to increase the values of R and C. But the duty cycle will always stay close to 50%. If you want the LED to stay on way longer than it's off (high duty cycle) this circuit won't do it. You should use the traditional astable circuit.
First thing that comes to mind is that the values for R and C are too small and the LED is blinking too fast to notice. Be sure that R*C is in the order of 1 to 0.1. Hope this helped.
Yes, the diode approach can be applied to obtain a rudimentary PWM: a potentiometer's middle pin is connected to pin 3 (OUT) and the other two pins (of the pot) are connected in series with diodes (in opposite directions) to che capacitor. By adjusting the pot position, the duty cycle changes. There are quite a few tutorials on this concept but applied to the traditional circuit so I avoided reposting the same stuff... Hopefully that's clear enough, Thanks for the question!
@@5VLogic Yes! Just wanted a second opinion before doing the field work/cogitating. I have set-up recently some 555 IC's with this type of adaptation: i.e., PWM and varying F with pots and diode biases. Daniel Talbot on YT his an exemple of mod. that can be adapted here for the need. Merci.
Okay so my oscillation is not a square wave, it has a step up before it goes to full voltage on the oscillation. Like a stair step pattern???? I'm so confused lmao
Standard request I always add to such videos: For the love of God and in the name of all that is holy, please include the VALUES of the components. Don't say "add a resistor". Say, instead, add "a XXX ohm resistor". Don't say "add a capacitor". Say, instead, "add a XXX farad capacitor." Otherwise great video.
I've tried with 5V and this don't work, with how many Volts did You set they circuito? Or its another bullsh*t vídeo? I'm tired of all people uploading videos that just are scams... Maybe it's just another scam video, or My capacitor it's damsged
Obwód działa! tak jak na filmie. Jeśli masz komponenty sprawdzone-musi działać. Mój timer 555 pracuje nawet przy Vcc=4,6V Moje komponenty: C =47 mikroF, R= 5K
Definition of a TRUE engineer....
Someone who can achieve the same objective as another "engineer" using less time and money.
You've earned another sub!
Also, is there a simple way to make the LED fade in and out rather than switching on and off with the square wave? I guess a triangle wave would work well for this. The limited bit of electronic knowledge I have makes me think of attaching an electrolytic to the LED in some way. When my breadboard arrives, I'll fiddle and see if this works. Maybe cap between anode of LED and ground. If I had my breadboard, I'd not have to ask this!!
you can use an rc low pass filter at the output to turn the square wave into a triangle wave :3
I use this circuit since 40 yearsm because of its simplicity. But you cannot expect to get a duty cycle of 50% with the NE, SE and LM version of the 555 timer due to the fact, that the output stage of these timers is not rail-to-rail. So I used the CMOS versions like the TLC555 or the LM7555 because of their real symmetrical output stage instead.
For the LM7555 you need to considerm that the voltage divider is not 33%, 67% but 25%, 75%. So the time constant of this device is considerably longer. You have to use another formala to calculate it. but considering the fact you get just other R, C values for the same frequency.
It is also easy to change the duty cycle for a certain frequency by using a potentiometer and two diodes to separate the charging resistor from the discharging resistor. If you need higher linearitiies you can implement two current sources instead of two resistors and diodes. In the simplest representation you can just substitute the resistor by two anti-serially connected constant current diodes.
So thats why i wasn't getting a 50% cycle! thank you :DDD
While I wouldn't use it for something very precise, it'll make a good clock signal for my LED chaser while saving a bunch of wiring and space. Thank you.
Awesome thankyou!!!! Hope to see you uploading again at some point soon 😁😁😁
I recall @Diodegonewild used this one to test his TC secondary, yet I still used the other arrangement in the meantime since seeing that
Nice and easy one mate, thanks for this
A plus! You earned a sub👍
I like this easy neat way of doing the same job.
another sub for this, this is sooo much simpler than what i was doing with two potentiometers and trying to get a 50% duty cycle, could get close but not exact
Another good video. Many thanks.
Why you only have 650 subs? Great video
Great video. 👍
Thanks very much
how would i have to wire and connect so that i can send a 1 second pulse on pin3 to my arduino ?
Is it possible to have a long duration blinking with this circuit?
Do you mean just low frequency, or high duty cycle, where the LED stays on way longer that it's off?
If you just want low frequency you only need to increase the values of R and C. But the duty cycle will always stay close to 50%.
If you want the LED to stay on way longer than it's off (high duty cycle) this circuit won't do it. You should use the traditional astable circuit.
how to increases and decrease time led on time adjust and off time
Mine works but it doesn't blink. The LED is just stable, I made sure I have a jumper connecting to pin 2 and 6.
First thing that comes to mind is that the values for R and C are too small and the LED is blinking too fast to notice. Be sure that R*C is in the order of 1 to 0.1. Hope this helped.
Theoretically is it possible to device a modification that will allow PWM? Asking for a friend :-) Félicitation, bon travail.
Yes, the diode approach can be applied to obtain a rudimentary PWM: a potentiometer's middle pin is connected to pin 3 (OUT) and the other two pins (of the pot) are connected in series with diodes (in opposite directions) to che capacitor.
By adjusting the pot position, the duty cycle changes. There are quite a few tutorials on this concept but applied to the traditional circuit so I avoided reposting the same stuff...
Hopefully that's clear enough,
Thanks for the question!
@@5VLogic Yes! Just wanted a second opinion before doing the field work/cogitating. I have set-up recently some 555 IC's with this type of adaptation: i.e., PWM and varying F with pots and diode biases. Daniel Talbot on YT his an exemple of mod. that can be adapted here for the need. Merci.
Sir what is the value of the resistor and capacitor
normally I’d say you can look at the resistor in the video but the code is very ambiguous. it’s not clear which band is the first band.
Okay so my oscillation is not a square wave, it has a step up before it goes to full voltage on the oscillation.
Like a stair step pattern????
I'm so confused lmao
When the LED is half-lit, it pulls more amps from my PS, and when its bright it drops back down? xD
Maybe my timers are broken lmao... i did get them from amazon lmao
Beats me, maybe check that the supply turn-on is not a slow ramp and check that your IC is good.
Also double-check the circuit just in case : )
@@5VLogic I got it to work xD
Dont know why it was doing the thing lol
Standard request I always add to such videos: For the love of God and in the name of all that is holy, please include the VALUES of the components.
Don't say "add a resistor". Say, instead, add "a XXX ohm resistor". Don't say "add a capacitor". Say, instead, "add a XXX farad capacitor."
Otherwise great video.
It's a phony video. The NE555N is controlled mono-stable with 1 resistor and 1 capacitor. Then use a blinking LED.
I've tried with 5V and this don't work, with how many Volts did You set they circuito?
Or its another bullsh*t vídeo? I'm tired of all people uploading videos that just are scams... Maybe it's just another scam video, or My capacitor it's damsged
Obwód działa! tak jak na filmie. Jeśli masz komponenty sprawdzone-musi działać. Mój timer 555 pracuje nawet przy Vcc=4,6V Moje komponenty: C =47 mikroF, R= 5K
Bro it works....
This is the first oscillator i ever made... and it worked the second time i tried to put it together lmao
Best video on UA-cam!