Experiments 4.1 : Applications - The 555 Timer Sequence
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- Опубліковано 13 чер 2010
- This is an experiment to set up a low frequency clock signal that we can use to drive our logic gate circuits. The clock will have a frequency of 1Hz, which will allow us to see the changes to our circuit as the clock cycles. This is one of the experiments related to EE223, an introductory module to digital and analogue electronics at Dublin City University. The associated details are at: www.eeng.dcu.ie/~molloyd/EE223/
Best explanation I've seen on the various 555 circuits thus far. Thanks!
Great videos I've been watching them all. More useful than the labs my college provides, with great explanations.
Great stuff, well narrated and detailed explanation .Looking forward to seeing more. A learning activity for all students and the hobbyist and teachers alike.
this is the best, this is the 1st time i know that frequency output is deterministic
Yes, have a look at the webpages tied to the video description for this video. Under "5. Clock Generator Circuits" I do out the calculations. If you change the values in these equations you can get any frequency that you would like.
Nicely explained.
Thanks again.
(I've been using 555s, with sensors, to semi automate my model trains).
Thank you so much you helped me a bunch so precise and simple!!!
Great explanation ! Thank you !
can i use 22uF instead of the 47uF since thats the closest i have, or should i use higher 100uF?
EDIT: So i used the 100uF and it works fine, im sure i calculated correctly; the frequency with this capacitor turned out to be around 0.56Hz
Tested 22uF: Flashes at around 2.14Hz
What if we remove the 10nf capacitor?
thank you!
marC:)
Yes, Derek is using an L7805 5V+ voltage regulator. The NE555 can take anywhere between 5 and 15 volts, but somewhere around 9-12 volts would probably be optimum.
Just a question, if I increase the resistance the LED will flash faster?
why did you connect the green long cable to random pin in the breadboard?
Derek can you have 2 leds flip flop on this circuit like at a reailraod crossing signal?
where would i have to cahnge the resistor that the frequenzy is lower than 1 hz
thanks for benefit tutorial from Syria . I wan to ask you these question
you are using a voltage regulator ?? aren't you ???
so what is the type of it and how many volts does the 555 need ????
where can i buy the capacitors
derek i have a doubt when i turn it on , my led doesnt blink its just on whats my problem there? pllzz i need healp
So far, so good. What I am really looking for is how input affects output. How much voltage do I need to put into pin 8 to get that thing to work. Further, if I pump x volts into that thing into pin 8, how many volts will I get out of pin 3?
Further, elementary circuits usually either blink lights or put out sound. If I am doing sound, will the notes I get be the same ones that match the frequencies of the musical scale , i.e. A4 = 440 hertz, C4 = 261.6 hertz, etc. ?
Derek, the algebra equations are too much for my old brain. I need the LED to be lit for one second and off for one second. I'll be using this circuit to run the nav lights on my 1/350 scale model of the Enterprise from Star Trek (almost 3ft long when completed). My lighting system will also be powered by 9V (a 9V wall wart). Could you tell me what values to use for R1-2 and C1-2? I could do trial and error if I had a large stock of components, but I don't. I would really appreciate your help.
Derek if you want to have the same clock signal but at a frequency of 1Khz using the same schematic, what capacitor and/or resistor will you use? Thanks
one more questiion how can i use this with a motor?
since the output is either high or low, you can put another led in the opposite direction going to the high rail. you may need to use a resistor to drop the voltage enough to not kill the led
since you are using a 5% tolerance resistor, that is no risk of the Hz frequency change? I mean, somewhere between 0.95Hz or 1.05Hz
but when i dont want a frequency of 1 kHz , the extra resistors are needed?
if for example i have 2.2 k and 4.7 k resistors ? .. Would i need the other resistors so the circuit work ?
anyway good job , and i hope u reply to me asap.
What is the longest delay you could possibly make using a combination of resistors and large capacitors? Thanks
***** hey pls share ans if u know how long we can make delay
Hi, can you explain something to me, it has nothing to do with this vid, but with electronics in general..
How can the mains voltage be stepped down only with resistors and capacitors? voltage divider? that type of circuit can only be used with very low power draw right?
I have a regular comercial motion sensor, it has 2 boards inside, the PIR circuit and the power/relay board. It takes the 220v and must reduce it in order for the remaining circuit to work.. How is this done?
Thanks! =)
Yes, that is perfectly correct. The LED is just an indicator of the pulse state.
Thank you Sir. ..good vedio. .
Derek those algebra calculations are bit too much for my old brain. I would like build this circuit for the purpose of using it to power the navigation lights on my 1/350 scale model of the Enterprise from Star Trek. It's a very simple circuit to build, my only problem is, I need the light to stay lit for one second. One second on, one second off. What value of resistors and capacitors do I need to use? If I had a bunch of them on hand, I could just do trial and error, but I don't.
Good video
Not working, I did exactly what you did. Maybe because of the resistors. Mine are lot smaller in size.
If you use a needle nose pliers it will be easier for you to insert the leads into the breadboard.
Its the output. He can attach it to whatever he wants to use a 1hz signal for.
So then, essentially, what you're saying is, the purpose of this experiment wasn't to get a blinking LED, it was to get a 1hz duty cycle, the LED was just to test the circuit. I am understanding correcting, cuz I'm a totally rookie (but learning more every day)
you want to control a motor with pwm? you can use a potentiometer in place of his 1k resistor to vary the duty cycle between 50% and 100%. just use the output to pulse your DC motor. as for a specific potentiometer value.... there are formulas out there, or just experiment ;)
Que pena ese tarnsistor Que esta junta ala resistencia se utiliza para controlar el voltaje de la bateria
GRAcias
risky maybe but going to try to trigger my quad adsr on me mod synthi just for fun.
next time try adding a trimer instead of fixed value resistor, to adjust the blinking time on your will.
search google for this phrase: 555 timer calc
0:51 one
Almost 1300 views and 1 LIKE!?!?! Come on People!!!
watch video 1.1
epo
jameco electronics
doesnt look like a very neat circuit :D
frys
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