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. # 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.