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Ultra Short, Ultra Fast LED Flash

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JAndrew:
If that is the case how hard would it be to adapt a typical flash camera circuit, to drive an LED?




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ogden:

--- Quote from: JAndrew on March 09, 2019, 09:25:46 pm ---If that is the case how hard would it be to adapt a typical flash camera circuit, to drive an LED?

--- End quote ---

In theory - yes. You may replace xenon tube with (250V...300V) LED string, modify trigger circuit. I am not sure about power capability - existing capacitor or bank will be enough or you need to add extra (capacitance). [edit] How hard - it depends on flash, it's circuit complexity.

Marco:
The new'ish 12V COBs seem to have better construction than those older ones.

JAndrew:
Trying not to reinvent the wheel, so I'm looking at flash circuit kits that I might just adapt to overdrive an LED.

Here's one I am looking at.

https://www.xenonflashtubes.com/flash-driver-modules/51-5v-optical-flash-trigger-photography-kit-diy_131.html#/30-flash_energy-10j_ws

I'm interested mainly in just the charge and trigger.  Looks like it can be trigger pretty simply, and It's in expensive enough that I could set up a few units to trigger simultaneously.  I suspect the 1000uF 450v isn't enough and will likely need to replace it with something larger.

I'll couple it with this 100w LED on COB that is supposedly rated for 9,000lm @ 28-36vdc@3000ma

eBay auction: #https://www.ebay.com/itm/10W-20W-30W-50W-70W-100W-High-Power-LED-Chip-COB-SMD-Bulb-DIY-Lamp-Light/263961952554?var=&hash=item3d755bc12a&enc=AQADAAAC8FjVrDbVsZ8oH%2F8PNHtt9VX4%2Fw7FZcmMuqsX8uaFEduV1JjTNcqxLENQ%2BAoiD9Vd%2Fo0t6JaYcgeiBJwDWg916eTMBW0ftEcw49m0a6WTi8bnXqMs1rT8%2FhEPw2EnUesyxZ4yaCmm3nWNnCBC77obZ03VtmDnTIEKS9Ra8EDyFGcD7BFW9%2BgJGn%2FX6rG1%2B%2F9YdGQAzZlDbBJ1KwsnmICW4EUSMkH4GvW%2BKjbiczw%2BnjyxtaHSdG9uBPK2AQHTlF9t6GJBJy19FBbuaz6d3Zneu2yCtAyqRKyR70YKKgJHYejwmZ7ID0t84YQJ8IhtgciwaCYRHvux4bD4%2B4UyzSPsDxVVVj8Hkp0nwaOKSUB383V29nAKRqyx6YYHi2wj%2FbLTYOsukafpYjDurl26JoRFx%2BnDIR12YoaoYkZvRUzQKvd%2Bg3L%2BQVGhqwQPrLGnpDiaDpxC6wnVJt95niIQ7ziF15W4hAKdaNra1Crqjdn2yEvljBVDCMP9GqL5IBxu08zjbPeeYTykPBuc3wXgVuwhXfqtV1cGCZr0MfxlOjRePdUwRXlNxOuuaH5Qps9lN1vZP4OuHqhBP%2BiaeiUc8o7NbyhS2bIpjagJX6xsc0WQRVLm4j2G6KHpCyICn7yBEwF3%2FuHWNFQPY3UhPf486TYHTxPeW5Y2dtGAI0oDlLt7Mf%2B45njYlojDp4VpRXER%2BkpRQiTJgiPzms2SLZnCOnVTVeBX0XlgFk41SY73Nujg3lAY9KkrpuAOyOtjwVJRH%2FvQR9ZwXTmswdeLyPa%2FBfUa7aznGxThaMRHONOhyZZYiotqe5%2Fjizn21%2BFlMxHaHZTiHVpgCDD1zw2pF9ZGY27SRDDllEVoa1d3Gzd0EPeV2jJ8A%2FweAWzGG5fTA3jiQEqXV42WQr9fNzu5kVWcHaEmQkKGEtChwYJm%2F13TJG7S6oJw7RbqoRUlxyPe6ZGsQnkINsEKSPQ3M%2Ft69st%2Bgs2ochwkyH0bU4ZsfMGUwzeLvMnA&checksum=26396195255498a2b9072f3042a086822bfd2b40e7f2

From there I should be able to use the photo transistor in the circuit to measure the flash duration. At this point I'm into the project for under $40 and should be able to prove out the concept

Marco:
Just drive them with a MOSFET, the capacitive discharge method is for xenon tubes ... it's a bit silly for a LED.

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