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555 timer chip question

post #1 of 37
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I want to make a blinking LED light. I am following these instructions. My LED's have a forward 3.4V and 20mA each. I'm using 10 LED's. Power will be coming from a standard 9v battery (non-rechargeable). Which resistors and capacitors do I need to change from the instructables diagram? Or are those just to make the 555 timer flash fast? As usual I'm confused when it comes to diagrams and electricity
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post #2 of 37
I want to put my bet in that the capacitor sets the blink rate (keep it the same), and R1 should have a lower resistance to raise the voltage across the LEDs to 3.4v.

either that, or maybe R2 sets the flash rate and the cap holds the charge to keep the LEDs on.

okay, really i have no idea. sorry.. wish I did.
Edited by otterpopjunkie - 1/20/10 at 7:16pm
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post #3 of 37
Damn its been years since I have done this, and 555 timers always sucked. Do you have a breadboard? It might be easier if you do.

And capacitors hold and increase charges if I remember. (Example: led will dim and go out with capacitor and without one it will go right out.)

All I know is I could follow the schematics. Other than everything else I learned in electronics class is gone. Sorry I couldn't really help.
Edited by Somenamehere - 1/20/10 at 7:32pm
    
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post #4 of 37
Thread Starter 
Quote:
Originally Posted by Somenamehere View Post
Damn its been years since I have done this, and 555 timers always sucked. Do you have a breadboard? It might be easier if you do.

And capacitors hold and increase charges if I remember. (Example: led will dim and go out with capacitor and without one it will go right out.)
I don't have a breadboard, I'll get one at Radio Shack along with everything else once I figure out exactly what I need. I don't want the LED's to dim, I want them to blink. Like a bike light.
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post #5 of 37
Quote:
Originally Posted by Boris4ka View Post
I don't have a breadboard, I'll get one at Radio Shack along with everything else once I figure out exactly what I need. I don't want the LED's to dim, I want them to blink. Like a bike light.
Yeah I got that, I was explaining what an led hooked up to just a capacitor did. Sorry I wasn't clear.
    
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post #6 of 37
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Quote:
Originally Posted by Somenamehere View Post
Yeah I got that, I was explaining what an led hooked up to just a capacitor did. Sorry I wasn't clear.
Oh ok. So do you know how I can wire my LED's? If you take a look at the instructions I linked to, I get all that. What I don't get is which resistors I need to change to give my LED's the correct voltage.
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post #7 of 37
OK here's some info for you; in the diagram they provided (seen below) the combination of R1 and R2 determine the ratio of time on vs time off and the C1 dictates the timing of the flashing (lower capacitance = faster flash rate).

If it were me, personally I would not power the LEDs directly from the 555 timer's output, but rather use that output to control a switching transistor and use that to operate the LEDs off of the 9V directly. I'd probably use a TIP122 transistor then use either a single 20R 1/4W resistor in series with 5 parallel series pairs of LEDs or 5x 110R 1/8W each in series with 2 LEDs and all of those in parallel running through the transistor.





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post #8 of 37
Sorry I was on my phone before, just got on the computer.

First off the leds are just hooked up normal nothing special. They are diodes though (led = light emitting diode) so they can only accept current one way. (If I remember its usually the longer pin, like I said its been years since I did this)

I used wikipedia for finding some more info on the 555 timer.

Quote:
Originally Posted by Wikipedia
1 GND Ground, low level (0 V)
2 TRIG A short pulse high-to-low on the trigger starts the timer
3 OUT During a timing interval, the output stays at +VCC
4 RESET A timing interval can be interrupted by applying a reset pulse to low (0 V)
5 CTRL Control voltage allows access to the internal voltage divider (2/3 VCC)
6 THR The threshold at which the interval ends (it ends if the voltage at THR is at least 2/3 VCC)
7 DIS Connected to a capacitor whose discharge time will influence the timing interval
8 V+, VCC The positive supply voltage which must be between 3 and 15 V
R1, R2 resistors plus capacitor hooked up to the 6th and 7th pin calculate the flash and output to pin 3 where the leds are.

Edit: radodrill seems to know what hes talking about. I tried
    
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post #9 of 37
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Quote:
Originally Posted by radodrill View Post
OK here's some info for you; in the diagram they provided (seen below) the combination of R1 and R2 determine the ratio of time on vs time off and the C1 dictates the timing of the flashing (lower capacitance = faster flash rate).

If it were me, personally I would not power the LEDs directly from the 555 timer's output, but rather use that output to control a switching transistor and use that to operate the LEDs off of the 9V directly. I'd probably use a TIP122 transistor then use either a single 20R 1/4W resistor in series with 5 parallel series pairs of LEDs or 5x 110R 1/8W each in series with 2 LEDs and all of those in parallel running through the transistor.

[]http://www.instructables.com/image/FKE2ME3FIHEWI62/The-Electronic.jpg[/IMG]
Ok, so I have no need to change R1, R2 and C1.

Why would you use a TIP122 transistor? I'm asking because Radio Shack doesn't have one, and how would it improve the circuit, if you don't mind explaining?

Also, does pin 3 output 9v in this configuration, or does it lose voltage through the circuit? If it is in fact 9v out of pin3, that means I wire the LED's and their resistors as if pin 3 was just a + on the battery?
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post #10 of 37
Quote:
Originally Posted by Boris4ka View Post
Ok, so I have no need to change R1, R2 and C1.
No; the only affect that they have is on the timing of the flashes

Quote:
Originally Posted by Boris4ka View Post
Why would you use a TIP122 transistor? I'm asking because Radio Shack doesn't have one, and how would it improve the circuit, if you don't mind explaining?

Also, does pin 3 output 9v in this configuration, or does it lose voltage through the circuit? If it is in fact 9v out of pin3, that means I wire the LED's and their resistors as if pin 3 was just a + on the battery?
The output of the 555 timer on pin 3 uses TTL (CMOS) logic signals where a false is a voltage ~0V and a true is an output voltage ~3V. As such, it it possible to light an LED directly from the output; however, the 555 timer can only provide a limited amount of current to the output as it is intended for logic/signaling (e.g. clock generator), drawing too much current from the output will cause the timer to fry or possibly explode. By connecting the output of the timer to the base of a switching transistor, you can control higher current (and higher voltage) devices without overloading timer.

Essentially you would wire the base of the transistor to the 555 output and the emitter of the transistor to ground then the light array would be connected between the 9V and the collector of the transistor. In this situation the transistor is operating as a high speed switch that allows current to pass through when the output of the timer is high (true).

Looking on the RadioShack website, they do carry a TIP120 transistor, which is nearly identical to the TIP122 and will work interchangeably.
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