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 Post subject: Is 2.2uf Ok?
PostPosted: 11.08.2003 09:02 
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This is as simple of a question as it can get, but will 2.2uf work instead of 1uf?
I bet this change will only result in a change in speed, correct?

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PostPosted: 11.08.2003 09:33 
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Yes, it should work. If I'm correct it will just slow down the animation a bit.

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PostPosted: 11.08.2003 10:01 
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Thx a lot Japala, i just finished wiring the circuit. But guess what... something is wrong, hmm..... sigh. Nothing happens.
I guess tommorrow, I'll work on trouble shooting the design. Damn and I wired and soldered it prefectly!
Can you check this schematic if its right? It's your design but I just made it easier to read and build.
http://gotslickmods.tripod.com/leds.jpg
Thx Japala. 8)

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PostPosted: 11.08.2003 10:14 
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hmm, for some reason tripod will not show the image, even when I copy&paste the link.

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 Post subject:
PostPosted: 11.08.2003 11:24 
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Sorry that happens sometimes, I'm too cheap to buy web space.
But I managed to add the images to a used html, here.
http://gotslickmods.tripod.com/stereo_meter.htm
8)

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PostPosted: 13.08.2003 00:59 
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Hey Japala, heh I tired the circuit without the 4N32 this time. It worked but... the leds all go crasy. Its hard to describe, but it appears to me that they change so quickly it looks as if they're all flickering. :cry:

But I'll keep trying, the recreation of the schematic seems to be find. If you have any tips for me I'll be waiting.

Bye :P

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PostPosted: 13.08.2003 09:09 
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Ok Japala, I bet your getting pissed by the whole thing. But this time I have something to show you.
http://gotslickmods.tripod.com/temp.htm
The leds are in the order you wrote down. But the sequence is all screwed up somehow.... I bet its the timer chip. Its the (LM555CN) but it says (NE555P) on it. What do you think? :wink:

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PostPosted: 13.08.2003 09:10 
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Ok Japala, I bet your getting pissed by the whole thing. But this time I have something to show you.
http://gotslickmods.tripod.com/temp.htm
The leds are in the order you wrote down. But the sequence is all screwed up somehow.... I bet its the timer chip. Its the (LM555CN) but it says (NE555P) on it. What do you think? :wink:

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PostPosted: 19.10.2003 20:12 
I replaced the 47k resistor with a 100k pot. That means that by adjusting the resitance, I adjust the speed of the lights running. When turning the pot all the way to minimum resistance (I think), the LEDs just flashed rapidly. Maybe you have a short circuit over your resistor?
And matbe you are using a 0.1µf capacitor and not a 1µf?

Anyway, maybe you already have sorted out that problem.
If the sequence is screwed up, you should just rearrange the wires or LEDs. To make them flash more slowly, so you could see the sequence easier, just add a 5 or 10µf cap where the 1µf is now, temporarily. That'll slow it down by five to ten times...


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PostPosted: 19.10.2003 20:20 
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Bard, nice to see you here in our forum. Welcome. :)

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 Post subject: Re: Is 2.2uf Ok?
PostPosted: 22.08.2008 09:20 
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If you use a different cap, you need to adjust the resistors on the 555 accordingly. Otherwise, the pulses will be too long and will cause the 4017 to, as you aptly put it, go crazy. I went with a 250 ohm resistor instead of the 47kohm and it worked fine (I'm using a 2 uf cap). The values don't need to be exact, they just need to be somewhere in the range that the 4017 can take.
Hope that helps


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 Post subject: Re: Is 2.2uf Ok?
PostPosted: 10.09.2008 09:52 
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:D Here I am 5 years later trying the same diagram.

This time I had the right parts and more experience. I successfully got the wiring to work, along with a 100k pot to control speed. Its a great idea and its works great.

I'll post a video later on.

Thanks Japala! Good to post in Metku again.


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 Post subject: Re: Is 2.2uf Ok?
PostPosted: 10.09.2008 14:18 
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To other users: frequency of that 555 timer (wich eguals to the rolling speed), is 1/ (1.4*C*R).
So, if you have one resistor or capacitor you want to use, but don't know what should be value of another component, to have same speed as in article, you should first calculate frequency of arcticles circuit. Then just R= 1/ (1.4*C*f) or C = 1 / (1.4*R*f), where f is frequency of articles circuit ( or any other frequency you want).


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 Post subject: Re: Is 2.2uf Ok?
PostPosted: 15.10.2008 08:44 
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So get this, I finished mounting all the LEDs and the circuit into my case. But now the 10th LED no longer works. The 1-9 LED cycle simply skips the 10th LED. It used to work, all 10 LEDs lit up right. Now it just comes out as nothing, just a blank pause.

I started to trouble shot making sure all the connections are good, LEDs work, ICs are good (I had 2 of the same 4017s and 555s). All of them checked out fine. When I looked closely at the non-working LED, it seems to faintly blink. But not in the order it should. Rather the "on" time spans half the entire cycle of the 9 other LEDs.

Looking closer at the non-working LED, when there is no HDD signal it blinks faintly but super fast . But when the HDD is on, it does the "on" thing as I explained prior.

Any ideas why this could happen if it originally worked? The parts are identical to Japala's parts. This is really frustrating :evil:

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 Post subject: Re: Is 2.2uf Ok?
PostPosted: 15.10.2008 11:33 
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I can't think of anything else but that you have the led connected to a wrong pin or that the pin is also connected to the reset pin and the circuit immediately jumps that led. It might have time to glow dimly for a few milliseconds. This doesn't explain the faint flickering when there is no activity though...


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