On 2005-12-12, Frank wrote:

I have been trying to build an Infrared strobe. I have been able to make the
diodes flash off and on using a 555 timer circuit. But I can not make them
strobe....I'm missing something here ????
What do I need to do to make the IR diodes STROBE BRIGHTLY not just turn off
and on ( I use Night vision equipment to see them). I purchased a real IR
Strobe (40 dollars) but its encased and I can't determine how
they made it strobe very brightly with just 3 diodes and a 9v battery. I'm
sure I need to hit the diodes with either a much larger voltage than normal
or something...
Any help would be great.

try this

+--------+---- 9V
| |
| . . . .|. . . .
| . VCC(8) .
| . .
+------------+--RES(4) OUT(3)--
| . NE555 .
+--[100K]----+--TH(6) DIS(7)------+
| . . |
+--TR(2) CV(5)-- |
| . . |
| . GND(1) . |
| . . . .|. . . . |
| | // |
+--------(--------|--+
| |
--- |
--- 10uF |
| Tant. |
| |
+--------+--- OV

larger capacitors for brigter flashes, smaller resistors
for more frequent flashes.

Bye.
Jasen