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Registered Member #2563
Joined: Mon Dec 21 2009, 10:17AM
Location: Australia
Posts: 280
Hello, i am trying to make a simple high speed photography setup whereas i have my camera set to a long exposure in the dark. then have a flash initiated for a breif moment to illuminate the image i want to capture. but since it was a awake at 2am, try it for the sake of it idea. i just had a disposable camera with a switch to set of the flash, and a digital camera on a 30 second exposure, and went i dropped something or whatever, i pressed the button at the same time and caught it on camera. but i was thinking with a sound activated switch to control the flash, the flash would just go off as the action happened, so i thought id buy a sound activated switch, but just asking for reference which one would be better for this purpose? FK409 or FK408 If its a stupid idea let me know.. lol
Registered Member #2099
Joined: Wed Apr 29 2009, 12:22AM
Location: Los Altos, California
Posts: 1716
You can have lots of fun with a microphone-activated flash trigger. [edit] I think the kits you cited will work, with a minimum delay caused by the mechanical relay. This site has a wealth of practical information, and very inexpensive kits for DIY flash photography:
Long ago I made a sound-operated flash trigger using a small hot-cathode thyratron. It replaced the second tube in an AM-radio-transmitter kit project from high school electronics class (which was pretty retro in the early 1970's, but still favored by good old Mr. Newell).
Registered Member #540
Joined: Mon Feb 19 2007, 07:49PM
Location: MIT
Posts: 969
You could also use a triac instead of a relay. The delay time would be a lot lower and so the timing would be a bit easier... I guess. A SCR should also be fine.
Registered Member #902
Joined: Sun Jul 15 2007, 08:17PM
Location: North Texas
Posts: 1040
I just use a Piezo Element with a potentiometer to adjust sensitivity that triggers an SCR, cheap easy and effective. Of course, that works better for more sharp sounds but my waterballons always worked!
Registered Member #1361
Joined: Thu Feb 28 2008, 10:57AM
Location: Cairns, Australia
Posts: 305
I did this once, using a cheap audio triggered strobe (Amazingly fast considering!), an Arduino, a solar cell and a laser. Shine the laser onto the solar cell, connect a potentiometer to the Arduino, and adjust so that the strobe triggers when the beam is broken!
Would have worked much better if I had of kept the strobe out of the image, and used a lower powered laser, but pretty good for 1st try! :)
Registered Member #2563
Joined: Mon Dec 21 2009, 10:17AM
Location: Australia
Posts: 280
Well i only have a 2 mega pixel phone camera at the moment, and my setup was a voice activated switch triggering a disposable camera's flash... but it works, here are some pic's and if you look closely you will see the microphone in some of the photo's
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*Cheap* High speed photography
