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#1
Posted to alt.electronics
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Help with IR LED Strobe
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. thanks Frank |
#2
Posted to alt.electronics
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Help with IR LED Strobe
-- "Frank" wrote in message ... 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. thanks Frank Without knowing your circuit it is hard to offer advice. What is the difference between "Strobing" and flashing on and off I am guessing that the commercial unit puts a lot of current thru the diode for a very short time to make bright pulse Dan Hollands 1120 S Creek Dr Webster NY 14580 585-872-2606 www.QuickScoreRace.com |
#3
Posted to alt.electronics
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Help with IR LED Strobe
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 |
#4
Posted to alt.electronics
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Help with IR LED Strobe
"Frank" wrote in message ... 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. thanks Frank If you need to use that many diodes, you might consider driving them from a transistor instead of directly off the timer. It may be a case of the timer not delivering enough current to drive the diodes (this could be why they are dim). To make them flash faster you need to calculate the components r1, r2, and c1 for a higher frequency. . ----== Posted via Newsfeeds.Com - Unlimited-Unrestricted-Secure Usenet News==---- http://www.newsfeeds.com The #1 Newsgroup Service in the World! 120,000+ Newsgroups ----= East and West-Coast Server Farms - Total Privacy via Encryption =---- |
#5
Posted to alt.electronics
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Help with IR LED Strobe
"Lacy" wrote in message ... "Frank" wrote in message ... 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. thanks Frank If you need to use that many diodes, you might consider driving them from a transistor instead of directly off the timer. It may be a case of the timer not delivering enough current to drive the diodes (this could be why they are dim). To make them flash faster you need to calculate the components r1, r2, and c1 for a higher frequency. . Also on your schematic I noticed pin 4 of the timer was left open. I don't see how your circuit can work like this. Pin 4 has to be tied back to positive in order for the timer to work. ----== Posted via Newsfeeds.Com - Unlimited-Unrestricted-Secure Usenet News==---- http://www.newsfeeds.com The #1 Newsgroup Service in the World! 120,000+ Newsgroups ----= East and West-Coast Server Farms - Total Privacy via Encryption =---- |
#6
Posted to alt.electronics
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Help with IR LED Strobe
Thanks to all for the assistance, I re-designed the circuit base on all the
suggestions. It's completely changed, still using the 555 but a mosfet, and inductor to trigger the LED's I'll post it as soon as I make sure it works "Frank" wrote in message ... 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. thanks Frank |
#7
Posted to alt.electronics
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Help with IR LED Strobe
Be sure to have a look in the Datasheet of the diodes. In sufficiently short
pulses they often accept currents exceeding 1000 mA. The perrmissible on-time is a few microseconds. "Frank" schrieb im Newsbeitrag . .. Thanks to all for the assistance, I re-designed the circuit base on all the suggestions. It's completely changed, still using the 555 but a mosfet, and inductor to trigger the LED's I'll post it as soon as I make sure it works "Frank" wrote in message ... 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. thanks Frank |
#8
Posted to alt.electronics
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Help with IR LED Strobe
"Frank" wrote in message ... 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. thanks Frank Although not an electronics answer, there is a simple IR filter that you can use over a camera flash, and I would guess other strobe. Slide film that has not been exposed, but has been processed (like that at the end of a roll of processed slide film) turns out to be mostly opaque to visible light, but mostly transparent to IR. I have used this techique to trigger slave flash units when I dont want the trigger flash to add little to no light to the scene. (As in some special backlighting effects, etc.) I just tape a piece of film over the flash and use Wein slave flash sensors to trip the other units. (Old heavy Norman flash units that arent made anymore but still work great.) Henry |
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