beginner purposes for education. i re draw for clarity track. original track is poor vision. try ask google.

simple.. i courius how it run. next day i willl tell the results need sponsorship to create this pcb free of charge.

Try to search any modification about running LED I found many creation design and different formation of this running LED. start from knight rider LED, Fountain LED, Wiper LED, Radar LED simulation, Star LED, can you mention other?

this is one simulate Atom with electron arround the core. of course not really arround. just Circle LED shine n shake. true running circle, each LED independenly run like radar LED you must make them matrix LED formation. add more ic 4017 so the design become more complex and more dizzy.

Parts Description

C1 1x 0.1uf Mylar Capacitor

IC1 1x 4017 IC

IC2 1x 555 Timer IC

L1-L98 98x Jumbo LED (any colour but blue) my design use more LEDs

Q1-Q5 5x 2N3904 NPN Transistor or try change BD 139 C1061 TIP31 or other high current NPN Transistor.

R1 1x 4.7k Resistor

R2 1x 680k Resistor

R3-R7 4x 470 Ohm Resistor

MISC 1x PC Board about 10x8cm , 9V Battery Snap, IC Sockets

this design try to split join output with separate resistor. if you think its not maksimum try change with dioda.

disscusions captured from https://www.abcelectronique.com/annuaire/montages/cache/3492/circuit-simulation-atome.html

SeanFalloy : This circuit will never WORK! because u need to use 8 diode on out pins the output is triggering a transistor which will amplify the signal to usable levels without the draw on the output Pins.

RedWagnum : This circuit works very well! I bought a couple of these in kit form from electronicsgoldmine.com a couple of years back. I substituted ultra-bright LEDs for the "100 for a buck" red ones that came with the kit. Red on the outer ring, then amber, green, blue, pink (yes PINK), and then an 8mm white in the center. Changed resistor values where needed and it works just great. I've run it from various voltage sources anywhere from 6V to 12V with no problems. The transistors get a little warm but the duty cycle is low enough that it is not an issue.

anonymous : I built my atom expander following the design on this page. But it didn't work at first because the capacitor was to small. Eventully after trying many capacitors a 220pf(0.22uf) worked and gave me a working project. So i don't know what happend, everything else is right it was just the capacitor. oh well, anybody building the project, if it doesn't work and the ic's are working make the capacitor a bit bigger like a 220pf.

Suraj : circuit diagram is not clear

ChrisWhewell : Is it a one-shot deal, or does it provide a continuous series of expanding light effect ? Thanks

Jo?o Silva Brito : Hello! Could you please send me or improve the showned Schematic because i can't see all the numbers in the ICs. It's really important! Thank's!

It's just me or its missing from the parts placement de led place or number 85. From my count is 97 leds not 98!?!? Please advise!

What yhe J letter means? J means Jumper It appears like J1, J2, J3, J4, J5 and J6! Thanks to double layer no more J.

Last Note :

The LEDs can be any colour but blue. For a very interesting effect, make one ring red, the next one green, the next one orange, then yellow, etc.

The transistors can be most any inexpensive NPN transistor (2N2222, PN2222A, Etc.).

For a very interesting (and expensive!) effect, replace the 2N3904's with 2N3055 power transistors on heatsinks and use 12 V 500ma incandescent bulbs instead of LEDs.

Good Luck.

rachmanbobo. i hate to write more.. because suddenly disonnected from pcbway.com then all my past that I wrote just gone with the wind. pcbway doesNOT have autosave draft every 1 minutes.. i lost my 5 minute typesentences.. make me sick. huh..