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Yes I do know that there is lot's of instructables on this circuit, and that is easy to program one on lets say arduino then to build one from scrap using analog electronics.

I made this last night so I wanted to share it with you.The circuit is based on NE555 oscillation circuit that feeds IC 4017, the output pin 3 on the NE555 is connected to clock pin (14) on the 4017.

The oscillation circuit creates oscillation, the frequencies of the oscillation depends on the resistors and capacitors that are in the circuit with NE555:

f=1,44/(R1+2R2)*C

4017 uses this waves to activate outputs from 0-9.The speed of LED-s on/of depends on the wave that comes from NE555.

There are many circuits online but they are working on same principle, it is easy to program a PIC to make a same effect but I already did this using arduino and PIC16f877 but a wanted to see al the magic using analog electronic and reuse materials predicted to go in garbage.

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For this circuit I used:

-3x LED
-1x NE555

-1x capacitor 3.3uF or 2.2uF

-2x resistors 1k and 10 k

-1x IC 4017

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<p>is the 1K resistor really needed? i only got 10K and 220r resistor atm.</p>
<p>very cool.</p><p>I have a whole collection of &quot;artworks&quot; using the 555 / 4017 circuits. Using switching diodes and transistors (super cheap on Amazon in bulk) the output from the 4017 can do some amazing things.</p><p>keep experimenting and watch for my schematics (mostly from the &quot;Radio Shack&quot; projects books of the early 80's) at https://www.instructables.com/Remedios667 </p>
<p>Nice, I also have a small collection of 555 circuits </p>
they also make dual and quad 555's on 14 and 16 pin DIP's. there is a tech book dedicated to just the 555 (by Forest Mimm's ?). <br> a lot of obsolete but still available chips are out there, I can't see anything that the Arduino can do that couldn't be done with basic logic chips so I'm slow to adopt learning to compile C scripts.<br> I have junk boxes full of projects that I'm not sure if I even documented.<br> the output's of early CMOS chips can be delicate....using basic switching diodes to avoid current spikes and reverse polaity's are a must.....also: always use chip carriers...nothing worse than having to extract a burnt out 4017....<br>
<p>I use standard 8 pin 555 but I will get some of 14 pin :D</p>
<p>You Should mention the great Web site you took this from.</p><p>http://www.talkingelectronics.com</p>
<p>I just took schematic but, credits go to them, tnx for mentioning that :D</p>

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