Fantastic Atom Expander


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Here is the schematic, PC board pattern, and parts placement for a "Fantastic Atom Expander". This circuit produces an "exploding atom" effect using 98 LEDs.

Schematic

This is the schematic of the Fantastic Atom Expander

PC Board Layout

This is the printed circuit layout for the Fantastic Atom Expander

Parts Placement

This is the parts placement for the Fantastic Atom Expander

Parts

Part
Total Qty.
Description
Substitutions
C110.1uf Mylar Capacitor0.1uF Ceramic Disc Capacitor
IC114017 IC
IC21555 Timer IC
L1-L9898Jumbo LED (any colour but blue)
Q1-Q552N3904 NPN Transistor
R114.7k Resistor
R21680k Resistor
R3-R74470 Ohm Resistor
MISC1PC Board, 9V Battery Snap, IC Sockets

Notes

  1. 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.
  2. The transistors can be most any inexpensive NPN transistor (2N2222, PN2222A, Etc.).
  3. 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.

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Comments

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anonymous
Fantastic Atom Expander
Sunday, February 10, 2013 6:18:05 AM
Verry lousy schematic do it right or do nothing att all!!!!!!
anonymous
Fantastic Atom Expander
Sunday, May 27, 2012 5:41:48 AM
verry rare .bad drauwing circuit and layout not logic
anonymous
Fantastic Atom Expander
Sunday, August 02, 2009 5:20:54 PM
J means Jumper
anonymous
Fantastic Atom Expander
Thursday, April 16, 2009 10:34:22 AM
What yhe J letter means? It appears like J1, J2, J3, J4, J5 and J6! Thanks!
Joćo Silva Brito
Fantastic Atom Expander
Thursday, April 16, 2009 9:59:32 AM
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!
Joćo Silva Brito
Fantastic Atom Expander
Thursday, April 16, 2009 7:02:54 AM
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!
ChrisWhewell
Fantastic Atom Expander
Friday, January 23, 2009 10:38:13 AM
Is it a one-shot deal, or does it provide a continuous series of expanding light effect ? Thanks
suraj
Fantastic Atom Expander
Tuesday, October 14, 2008 12:41:35 AM
circuit diagram is not clear
anonymous
Fantastic Atom Expander
Wednesday, April 23, 2008 12:59:36 AM
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.
RedWagnum
Fantastic Atom Expander
Saturday, March 15, 2008 8:27:24 PM
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.
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