timer555 to generate single pulse

Status
Not open for further replies.
There are plenty of tutorials online about the 555 timer, and how to adjust the timing intervals. I would advise you to research it on Google; researching will prove to be an invaluable tool in your future.
 
I'm going to try to be a little more help than my outer space friend, it sounds like what you need is a serious duty cycle motification. You can check the data sheet for help, but what I would recomend is a simple astable oscillator, but you can calculate the resistor values using the equations given.

The charge time (output high) is given by: t1 = 0.693 (R1 + R2) C
and the discharge time (output low) is given by t2 = 0.693 (R2) C

Some simple algebra should allow you to work the equation backwards, hope this helps.

Vince
 
Last edited:
Thanks

Hi, I have did a good research, I am able to do the time delay by 20 sec, but after that I need a signal for 1ms or so. Right now I what I get is 50% ON and 50% OFF cycle. Am still on researching. Will something help with 3timers.. ?
 

Haha, well met indeed my friend! I haven't heard from you in a while, so it's good to see you on again. Seriously though, there are more 555 timer tutorials out there than man knows about; it doesn't take much effort to research it. I have to agree with MikeMl, he just wants us to do the work for him.
 
Last edited:
Hi, I have did a good research, I am able to do the time delay by 20 sec, but after that I need a signal for 1ms or so. Right now I what I get is 50% ON and 50% OFF cycle. Am still on researching. Will something help with 3timers.. ?



 
For that extreme difference in On and Off times you might want to use two 555s or a 556. A 20 sec astable triggering a 1mS monostable.

Ken
 
EN0 said:
Haha, well met indeed my friend! I haven't heard from you in a while, so it's good to see you on again.
Click to expand...

Well, I meant to write, but I was really caught up in a new computer game I got, the site to which can be found here: HiTech Creations - Aces High It's a lot of fun even though I keep getting killed

If Tiger wants someone to do the work for him, then he might want to try using the 555 calculator on the ETO website under tools (Hint-Hint). If he plays around with that a little bit then he may come out with the values that he wants. I also think that kMoffet may be right, a set of 2 timers would work best.
 
KMoffett said:
For that extreme difference in On and Off times you might want to use two 555s or a 556. A 20 sec astable triggering a 1mS monostable.

Ken
Click to expand...

I would take that route or use a 555 astable for the 20 seconds and let that drive maybe a 74123 for the one shot.

Ron
 
Why use an 8-pin and a 16-pin chip (only 1/2 used) instead of two 8-pin chips, or one 14-pin chip? Or maybe one 8-pin PIC?

Ken
 
Here is my suggestion:
 

Attachments

  • DF59.png
    36.3 KB · Views: 207
  • DF59a.png
    18.4 KB · Views: 192
KMoffett said:
Why use an 8-pin and a 16-pin chip (only 1/2 used) instead of two 8-pin chips, or one 14-pin chip? Or maybe one 8-pin PIC?

Ken
Click to expand...

This would be a piece of cake with a PIC, but I'm not sure if the OP has had any programming experience. His objective is still conceivable with a 555 timer, so that might be easier and faster for him despite more components involved.
 

A computer game?! Oh no! You got sucked into the vortex too?

Work is something that everyone should get used to; the sooner the better. You can't hide from it for long, unless you don't want to get anywhere in life.
 
Hi mate,

I was all in a sudden into electronics, So I was totally worried to get the solution for the next day. Nothing like I am into electronics and know all the websites and so. When in tention nothing was coming up. Anyway Thanks for all your help, at last as you said, i found all the website, calculators etc.. etc..

Cheers.



 
Thanks Mike,

It was all of a sudden I fall in electronics field. And I dont know where to search and really forgot all the basics of electronics. First assigment was so to generate a pulse and was going out crazy. Thanks for the time to explain me in detail. If you dont mind, can you please tell me what stimulator you using, I am looking one to test my work, now I am using Circuit Simulator Applet

Thanks in advance.

MikeMl said:
Here is my suggestion:
Click to expand...
 
Hi Mike,

I am looking to connect two PCBs, vertically. Just like our Systems Mother board and PCI slot, for that what type of connectors should I use? On research, I just came accross some Bus connectors, But I am looking for something I can plug in like PCI cards..

Any help?

MikeMl said:
LTSpice. Free download at Linear.com
Click to expand...
 
Status
Not open for further replies.

Similar threads

V
  • Question
Convert a single-phase motor to a three-phase
Replies
4
Views
1K
ZipZapOuch
V
  • Question
Single or Dual output on generator ?
Replies
0
Views
44
vidalv
V
C
  • Question
AD5220 digipot goes to limit in 1 pulse
2
Replies
27
Views
4K
Nigel Goodwin
D
Where to buy single components (reasonably priced)?
Replies
13
Views
2K
DRJP
D
F
  • Question
Pulse rating of 3W wirewound resistor?
Replies
8
Views
2K
Flyback
F
Menu
Log in
Register
Cookies are required to use this site. You must accept them to continue using the site. Learn more…