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Tonight I put together another [URL="http://desmonddowns-ttlblflash.blogspot.com/2010/01/i-have-been-asked-to-share-my-technique.html"]sound activated switch[/URL]



and instead of wiring it up to a flash I wired it up to my other invention .... the sparking machine !



Now when there is a sound it triggers the coil which switches via a relay at around 20X per second and generates up to 25000 volts .
I took an old power cord and joined the wires to the output and modified the end of the cable to provide a controlled gap for the spark to jump across - probably around 10000 volts .
Now I need to work out how to fill a balloon with gas without letting too much escape , then I place it on top of the power cord , make a noise .... boom !




;D


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That looks scary + dangerous hahaha... but looks like lots of fun too..

Hi. You are crazy. Thanks.

you are one crazy south african!


looking forward to see the explosion pictures!

Tonight I did a few tests - first I set up the contraption just to see how well it would ignite some white spirits [ benzine ]



Initially I was interested to see what effect flash would have on fire - just for interest .





I need to do some more tests to find the right settings before committing to time consuming setups .



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And a few more tests ...

And the last few - I notice that flash simply adds the smoke to the exposure .

I prefer it without the flash, maybe MORE FIRE??????

(05-19-2010 09:01 PM)CTM Wrote: [ -> ]I prefer it without the flash, maybe MORE FIRE??????

The amount of fire will increase once I work out how to trigger it from the camera
Tonight I disconnected the trigger wire that goes to the flash bulb itself and ran an earth wire next to it .
I can trigger a 2mm spark across the gap via a wireless flash trigger but unfortunately it wasn't enough to ignite the mixture





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I think I need to modify the spark gap a bit . Tonight I set up some 'almost' empty paint cans and shot them , with the sparking circuit leaning up against the can . I had the sound activated trigger connecting the sparking circuit through its relay and had to unplug the battery each time - I think the load is a bit much for that relay and it sticks a bit .
I shot with the D90 in high speed mode at iso 200 , F9 and 1/1000th sec and only got one real fireball out of the lot , none of the others ignited . Since it was raining I stood in the garage with the can just out of the shelter ....



I should have used a wider lens because the fireball crept along the ground and wasn't all in the picture . There was a bit of a 'Boom' and I think the garage window opened a few more inches behind me .



That was a bit disappointing so I set up a plate of white spirits again .




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What really annoyed me was the fact that the 'easy to take ' pictures of a fire burning in the plate looked nicer than the set-up picture that never came out so well ... for now .

cool photos.. more fire more explosion!!!