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PostPosted: 19.05.2009 01:48 
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Junior Modder
Junior Modder

Joined: 19.05.2009 01:40
Posts: 1
Hi Japala and others,

I'm new to the electronics scene and don't have much background, but am very eager to learn. I've been doing a lot of research on the net and found a couple of circuits online using 555timers, Op Amps, and even PWN to fade LEDS. From looking around, this looks like a robust solution and I was wondering if it can be scaled up to 30leds, on two different fading time circuits? I.e. 20 leds fade on one rhythm, 10 leds fade on another rhythm.

Thanks in advance!


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PostPosted: 19.05.2009 08:04 
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Regular Modder
Regular Modder

Joined: 02.11.2006 19:30
Posts: 249
Hi Guillow. Yes it's possible.

Image

So that's the circuit, if someone didn't remember. You can add leds in parallel with those that are in schematic. You just have to calculate the resistors for them (actually, you have to calculate them, even if you use one led =) ). In schematic, led that is over the PNP-transistor is in oppisite state than one under the NPN-transistor (of course, those transistors are controlled with same output).


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PostPosted: 19.05.2009 08:24 
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Site Admin
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Joined: 24.01.2002 10:09
Posts: 4683
Location: Finland
Use http://ledcalc.com to calculate proper current limiting resistors for each of the led array your are going to power with the circuit.

As you can see from the datasheet of the LM324, you can use a supply voltage all the way up to 32 volts for the whole circuit.
http://www.national.com/mpf/LM/LM324.html


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