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Yongnuo Flashes

Fantastic Atom Expander

Fantastic Atom ExpanderFantastic Atom Expander

Fantastic Atom Expander

Parts

C1 0.1uf Mylar Capacitor 0.1uF Ceramic Disc Capacitor
IC1 4017 IC
IC2 555 Timer IC
L1-L98 Jumbo LED (any colour but blue)
Q1-Q5 2N3904 NPN Transistor
R1 4.7k Resistor
R2 680k Resistor
R3-R7 470 Ohm Resistor
MISC PC 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.

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.

Source: www.aaroncake.net

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