Go Down

Topic: can you calculate resistors based on capacitors in 555 timer? (Read 3952 times) previous topic - next topic

ohilukasz

basically I have a 22 nF cap. and a 10v 47uF cap. and was wondering if I can make them work to make a LED flash. I have a ton of resistors, just only two kinds of cap. no idea how I would calculate this, any help would be appreciated, even a reference were I can read more about this and how to calculate this would be even better.

after I get this rolling, next I want to make it random, can you do that with series of 555 timers or would I need something else?

cmiyc

Capacitor Expert By Day, Enginerd by night.  ||  Personal Blog: www.baldengineer.com  || Electronics Tutorials for Beginners:  www.addohms.com

CrossRoads

Have you looked at any of the charts on the 555 timer data sheet for pulses & astable & monostable operations?
Designing & building electrical circuits for over 25 years.  Screw Shield for Mega/Due/Uno,  Bobuino with ATMega1284P, & other '328P & '1284P creations & offerings at  my website.

terryking228

The web has MUCH about the 555! 

Some INFO on the ArduinoInfo WIKI here - http://arduinoinfo.info   See:
http://arduino-info.wikispaces.com/Popular-ICs

I like to think of the 555 as a flip-flop with 2 comparators controlling when it is set and reset. Like this:

 

The 555 was designed in 1971 by Hans R. Camenzind, who died a short time ago.  None of us will ever design something as well known and widely used.
Regards, Terry King terry@yourduino.com  - Check great prices, devices and Arduino-related boards at http://YourDuino.com
HOW-TO: http://ArduinoInfo.Info

ohilukasz


Have you looked at any of the charts on the 555 timer data sheet for pulses & astable & monostable operations?


I have not, would that be provided by the manufacturer? I honestly don't even know where to start.


ohilukasz


The web has MUCH about the 555! 

Some INFO on the ArduinoInfo WIKI here - http://arduinoinfo.info   See:
http://arduino-info.wikispaces.com/Popular-ICs

I like to think of the 555 as a flip-flop with 2 comparators controlling when it is set and reset. Like this:

 

The 555 was designed in 1971 by Hans R. Camenzind, who died a short time ago.  None of us will ever design something as well known and widely used.


indeed. this is neat, however I still have no idea how to make it work in a practical sense. No idea what the capacitors and resistors are doing other than a guess of supplying the eventually powered LED with correct values. but what happens inside the 555 is beyond me!

cjdelphi


The 555 was designed in 1971 by Hans R. Camenzind, who died a short time ago.  None of us will ever design something as well known and widely used.


Truly a sad loss...

however... saying "none of us" would imply you have a time machine....

Far-seeker



The 555 was designed in 1971 by Hans R. Camenzind, who died a short time ago.  None of us will ever design something as well known and widely used.


Truly a sad loss...

however... saying "none of us" would imply you have a time machine....


Maybe terryking228 was being a bit hyperbolic; but remember Mr. Camenzind was not only around during the first generation of mass produced integrated circuits, he designed some of them that are still commonly being used today!  Fundamental shifts of that magnitude in the electronics design are not just uncommon, they are rare, as most technological progress is incremental (despite often being impressively so).  So IMHO while it is certainly possible a forum user could do something as significant in the future; regardless of personal ability (which is important too) it's very difficult unless you happen to be at the right place at the right time, and the right time doesn't occur very often (maybe two or three times during an average lifespan). 

terryking228

#9
Sep 20, 2012, 07:12 pm Last Edit: Sep 20, 2012, 07:17 pm by terryking228 Reason: 1
Quote
however... saying "none of us" would imply you have a time machine....
Maybe terryking228 was being a bit hyperbolic;


Possibly .. 8)

Actually I hope to be wrong about that, and I believe that Arduino is connecting to some of the best minds in the world, and not just those who are as Nerdy as (I/we) were as a young person.  I'll be doing a MakerFaire Arduino booth in a few days, along with one of my Engineer sons and a 16 year old Grandson who has built quite a cool robot.  

If anyone is teaching/showing Arduino to a young person who is short on money, please email me and I'll be happy to donate a Kit or Two like these: http://goo.gl/xaFjn  

555 Online Calculator here: http://freespace.virgin.net/matt.waite/resource/handy/pinouts/555/
And TI has this one: http://www.ti.com/tool/tlc555calc

Regards, Terry King
...In The Woods in Vermont, USA
The One who Dies with the Most Parts LOSES...
Regards, Terry King terry@yourduino.com  - Check great prices, devices and Arduino-related boards at http://YourDuino.com
HOW-TO: http://ArduinoInfo.Info

retrolefty


The web has MUCH about the 555! 

Some INFO on the ArduinoInfo WIKI here - http://arduinoinfo.info   See:
http://arduino-info.wikispaces.com/Popular-ICs

I like to think of the 555 as a flip-flop with 2 comparators controlling when it is set and reset. Like this:

 

The 555 was designed in 1971 by Hans R. Camenzind, who died a short time ago.  None of us will ever design something as well known and widely used.


I agree with that statement Terry. The classic 555 chip will most likely be the IC chip with longest continuous production run ever, if it does not already hold that distinction.

Lefty

Go Up