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Offline osnapTopic starter

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555 timer confusion
« on: March 04, 2007, 01:34:42 PM »
hi all,

I've been reading that you can make some cool simple circuits using 555 timers.  I looked and I saw that radioshack had one, so I think I'm going to buy some -- but I'm confused I know it doesn't need to be programmed, so, what would be needed to make a simple flashing LED circuit or something?

thanks, any help is greatly appreciated  ;D
« Last Edit: March 05, 2007, 07:02:44 PM by osnap »

Offline 555 timer chip guy

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Re: 555 timer confusion
« Reply #1 on: March 04, 2007, 07:52:51 PM »
Here are some cool projects one is an astable oscillator (if you attach an LED to the output it will flash) and then  if you get a 556 duel trimer or 2 555 timers you can make a  light seeking robot with the uther schematic

Offline osnapTopic starter

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Re: 555 timer confusion
« Reply #2 on: March 04, 2007, 07:54:49 PM »
Woa... uh.. could you just explain the schematic a bit?
I already don't understand 555 timers much as it is lol

Offline gamefreak

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Re: 555 timer confusion
« Reply #3 on: March 04, 2007, 08:17:48 PM »
well those schematics helped me figure out my 555 timer, but they arent very.... pin friendly

http://www.uoguelph.ca/~antoon/gadgets/555/555.html, has the pin positions so if you base off both of the drawings then you can get a working LED flasher with adjustable speed
All hail Rodney, the holy 555 timer
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Offline osnapTopic starter

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Re: 555 timer confusion
« Reply #4 on: March 04, 2007, 08:19:09 PM »
how is the speed adjusted?

Offline 555 timer chip guy

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Re: 555 timer confusion
« Reply #5 on: March 04, 2007, 08:22:16 PM »
OK it is really quite simple their are two different basic types of circuits for the 555 one is astable that is gust a  continues pulse. Here is an example.then there is monostable witch is triggered and last for a specific amount of time. for more info got to www.kpsec.freeuk.com/555timer.htm this is were I learned every thing I now about the 555 and 556 timers.

Offline 555 timer chip guy

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Re: 555 timer confusion
« Reply #6 on: March 04, 2007, 08:24:01 PM »
how is the speed adjusted?
it is adjusted with the 50k pot

Offline osnapTopic starter

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Re: 555 timer confusion
« Reply #7 on: March 04, 2007, 08:27:20 PM »
hmm okay, I guess I just need to read more then before I try and work one of these

Offline Brandon121233

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Re: 555 timer confusion
« Reply #8 on: March 04, 2007, 10:16:14 PM »
If you really want to understand them the BEST book is by Forest Mims the 3rd called Timer, Op Amp & Optoelectronic Circuits & Projects, it has detailed schematics and explanations for everthing you would want to know.
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Offline Hal9000

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Re: 555 timer confusion
« Reply #9 on: March 05, 2007, 11:36:44 AM »
This is possibly the ultimate book for you:

http://www.amazon.co.uk/Integrated-Circuit-555-Projects-BP/dp/0859340473/ref=sr_1_1/203-6935087-2798348?ie=UTF8&s=books&qid=1173116172&sr=1-1

It reads like an old uncle who smells of old spice.
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Offline robot321

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Re: 555 timer confusion
« Reply #10 on: March 05, 2007, 02:59:20 PM »
I can post a blinking LED circuit if you need it.

Offline osnapTopic starter

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Re: 555 timer confusion
« Reply #11 on: March 05, 2007, 07:02:19 PM »
Thanks for those two books :)

And ya, robot321, I'd like that very much

I found this circuit that I want to try:
http://www.doctronics.co.uk/images/555_10.gif

but I'm confused about what connects where -- I couldn't find a shot from the bottom, lol

Offline trigger

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Re: 555 timer confusion
« Reply #12 on: March 05, 2007, 07:05:03 PM »

but I'm confused about what connects where -- I couldn't find a shot from the bottom, lol

It's a breadboard pic--no need for a shot from the bottom. :)
There are 10 kinds of people in this world: those who can read binary, and those who can't.

Offline osnapTopic starter

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Re: 555 timer confusion
« Reply #13 on: March 05, 2007, 08:11:52 PM »
oh... so it is  :-X
rofl thanks

Offline osnapTopic starter

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Re: 555 timer confusion
« Reply #14 on: March 05, 2007, 11:35:55 PM »
Hey, if wanted to make this, does this mean that the two output wires are my + and -, that I would connect to a LED if I wanted to have it flash every 120 seconds?

also, on the left, is that the + and - from like 9v battery?

Offline robot321

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Re: 555 timer confusion
« Reply #15 on: March 06, 2007, 10:16:13 AM »
Log-in to view attached 555-timer circuit

Offline ed1380

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Re: 555 timer confusion
« Reply #16 on: March 06, 2007, 05:27:40 PM »
You could put a pot where resitor one is to regulate how fast is flashes right?
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Offline osnapTopic starter

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Re: 555 timer confusion
« Reply #17 on: March 06, 2007, 06:34:19 PM »
Thanks, Robot321.  (Instead of that 1 6v, 4 AAs would work, right? lol
« Last Edit: March 06, 2007, 07:13:35 PM by osnap »

Offline robot321

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Re: 555 timer confusion
« Reply #18 on: March 06, 2007, 07:12:30 PM »
osnap: yes 1.5vx4 =6v   

ed1380: yes a pot would do nicely ;)

Offline osnapTopic starter

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Re: 555 timer confusion
« Reply #19 on: March 06, 2007, 07:15:03 PM »
what is a pot? lol
« Last Edit: March 06, 2007, 07:26:57 PM by osnap »

Offline robot321

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Re: 555 timer confusion
« Reply #20 on: March 06, 2007, 07:18:03 PM »
pot short for potentiometer are adjustable resistors.
« Last Edit: March 06, 2007, 07:20:47 PM by robot321 »

Offline osnapTopic starter

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Re: 555 timer confusion
« Reply #21 on: March 06, 2007, 08:08:10 PM »
cool -- i think i'll try making what you posted.
(is a breadboard worth investing into?)

Offline 555 timer chip guy

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Re: 555 timer confusion
« Reply #22 on: March 08, 2007, 06:02:07 PM »
cool -- i think i'll try making what you posted.
(is a breadboard worth investing into?)
A bread board is the most important prototyping tool you will ever use.

Offline sdk32285

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Re: 555 timer confusion
« Reply #23 on: March 08, 2007, 09:50:58 PM »
Here's a useful link
it can solve for resistance(R1 and R2), capacitance, frequency, time-on, and time off.

http://noisybox.net/electronics/555.php
(you need to enter 3 of 4 values)
« Last Edit: March 08, 2007, 09:56:56 PM by sdk32285 »
Robots for Roboticists Blog - http://robotsforroboticists.com/

Offline osnapTopic starter

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Re: 555 timer confusion
« Reply #24 on: March 09, 2007, 06:23:01 PM »
Thanks

last thing -- i bought a breadboard - am i supposed to remove the paper on the back so the little metal peices show?

Offline Eco19R

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Re: 555 timer confusion
« Reply #25 on: March 09, 2007, 06:25:36 PM »
Leave it on.

 


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