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Old 20th July 2002, 03:20 AM   #1
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Default how? --> making a flashing led

hey guys, i'm curious if you might have different methods of creating a flashing led. Like you see in cars.

My plan is to make a flashing led. One that i can easily set a delay with. Then i would like to attach a capacitor to it and make it fade in and out, instead of turning on and off. Unless you guys know a method without using a cap?

Thanks
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Old 20th July 2002, 03:37 AM   #2
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ok well you can buy flashing led's but they wont fade in and out ... you could use a 2 transistor oscillator with the cap and led ... that circuit would achieve all of your objectives and is probably the simplest available for the task.
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Old 20th July 2002, 03:43 AM   #3
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Default Fading in/ out

You could always try this circuit , add a pot and you can set time laps you want.

-Simon
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Old 23rd July 2002, 12:25 AM   #4
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If you want a very very very simple flashing led, you buy a Pink Floyd Pulse CD (vinyl doesn't have it) and U get one for free
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Old 23rd July 2002, 01:08 PM   #5
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Quote:
Originally posted by PedroPO
If you want a very very very simple flashing led, you buy a Pink Floyd Pulse CD (vinyl doesn't have it) and U get one for free
haha i thought about doing something like that.
But then i found something similar lying around my place.
basically it's a chip covered in a black coating. then theres a tiny resistor, and a diode, and 2 transistors. I wanted to modify it to change the flash time and also add a cap to make it fade in and out..... but... I have no idea how it works. damn!

Though I am looking for the simplest circuit available... hehe

Thanks for the information coming in, i'm looking into it.

keep emm coming if anyone has more ideas
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Old 23rd July 2002, 01:11 PM   #6
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Quote:
Originally posted by AudioFreak
ok well you can buy flashing led's but they wont fade in and out ... you could use a 2 transistor oscillator with the cap and led ... that circuit would achieve all of your objectives and is probably the simplest available for the task.
hmm... i hate to sound like an electronics newbie...
which i unfortunatly am...

a 2 transistor oscillator, what would be the part number for that, or how would i know what piece i'm looking for? I know oscillators from ..... uhm... fm radios, they have oscillators which turn to tune frequencies ( if i remember correctly ). Would you have a sample circuit handy? It does sound like a simple circuit.

Thanks
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Old 23rd July 2002, 01:27 PM   #7
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It's the circuit above the flashing bug eyes circuit in the link that NU_NRG posted ... use the flashing bug eyes circuit instead.
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Old 23rd July 2002, 07:01 PM   #8
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Quote:
Originally posted by AudioFreak
It's the circuit above the flashing bug eyes circuit in the link that NU_NRG posted ... use the flashing bug eyes circuit instead.
oh ok cool

I'm actually going to give that a shot.

Thanks
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Old 23rd July 2002, 07:36 PM   #9
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Unhappy sigh..

nobody listen to when I talk...


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Old 23rd July 2002, 08:34 PM   #10
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Default Re: sigh..

Quote:
Originally posted by NU_NRG
nobody listen to when I talk...


hehe actually i checked out the link you posted and thought it was good. I was hoping for more feedback so i hadn't responded right away.

But yeah, actually overall the page itself has a bunch of good infomation.
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