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Smooth LED lighting

February 19, 2013 Computer DIY 87 642 10

Today I’m listening to you, I want to introduce a simple scheme that does not have serious practical application, but rather is created in order to please the human eye. The purpose of this circuit is that it lights up the LEDs connected to it quite smoothly and slowly, while there are no threshold jumps, as, for example, on Chinese Christmas garlands or when using a microcontroller. Actually, here is the scheme itself:

It is assembled from very affordable parts that can be pulled out of old Soviet technology or, like me, bought. All the details cost me 18 rubles. I used a smd resistor to reduce the bulkiness of soldering.

I used this circuit to illuminate the system unit with a LED strip with a 12v power supply, these same 12v I took from the fan connector on the motherboard. Enthusiasm for the capacitance of the capacitor can increase the “ignition” time of the LEDs; you can also experiment with the resistance rating.
System operation video:

come back

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Comments (10)

#1 Plunya Guests September 24, 2013 14:38
0

and such a system does not overheat with prolonged use?
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#2 Maksim Guests September 25, 2013 18:57
0

That's just the point. Or just bum ...
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#3 c.k.-85 Guests January 19, 2014 06:41
0

But how can she use it if she can smell? Backlight may be needed for a long time.
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#4 ErMaK Guests January 31, 2014 08:35
0

In the evening I begin to test, I will start thinking after it smells!))
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#5 Ilnar Guests February 14, 2014 2:44 p.m.
0

You can use 2000 microfarads 25 volts
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#6 the guest Guests April 30, 2014 20:53
0

Yes, you can just light up faster
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#7 Humanoid Guests July 23, 2014 23:20
0

Better to use a PWM controller ... better energy efficiency and no overheating. Although, it will be more bulky and more expensive.
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#8 Edward Guests April 19, 2015 22:26
1

it is more powerful to take a transistor or a field effect transistor like IRFL3205, they can drag about 40 amperes through themselves. They have a small transient resistance. When the LEDs are powered, they will not heat at all
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#9 Guest Vadim Guests February 26, 2017 18:59
4

Tell me, did according to the scheme! Why quickly flares up and slowly goes out?
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#10 Guest Alex Guests May 23, 2018 07:55
0

it would be better instead of kt817 to take mje13003 or 13002 or 13009. I took the last one, it works, it does not overheat. I even left it without a radiator)
but kt817-you need to plant on a good radiator. 5-10 minutes and it's hot already
- To answer