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The lounge Relax, take a break from photo and camera talk - have a chat about something else for a change. Just keep it clean and polite!

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Old 28th November 2009
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Talking "Hydra" FLASH MkII

As some of you may recall, a while back I played about with 12 disposable camera flashes to cobble together a ring flash.



While it worked (I use that word loosely) it was a tad unreliable and smoke would issue forth at regular intervals

SO: I put it to one side (along with my many other "experiments") and some while later, during some particularly poor weather, set about building the MkII





This was all together a leap in engineering, as now the 12 tubes were all mounted in a purpose built reflector housing (OK! so it's a Bun Ring Mould , but you have to credit me with the ingenuity) With the power pack and thyrister controls ( impressed now arn't you ) made out of a modified Vivitar gun. An additional capacitor bank was also constructed with a truly lethal 1440 mF capacitance running at 360 Volts.

Once again, the reliability was an issue with component failures (disposable cameras really are made of rubbish bits) being a regular feature.

For those still reading this... you have to remember that it was horrible weather and I enjoy "Playing" with things like this...

Finally I consigned the whole thing to the bin, both out of frustration with the failures of tubes, etc., and the thoughts that this thing was damaging the ozone layer, would give models reasons to sue me (more so than normal ) and the EMP it generates may well fry the camera ...

To be serious, and as a warning to others, messing about with these things is VERY DANGEROUS - and could KILL

Will there be a MKIII Oh Yes The heads have been delivered & tested and the control gear is on route from Hong Kong.

Once I've completed it, I'll post the next installment
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Old 28th November 2009
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Re: "Hydra" FLASH MkII

Far too much time on your hands!
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Old 28th November 2009
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Re: "Hydra" FLASH MkII

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Originally Posted by Graham_of_Rainham View Post
An additional capacitor bank was also constructed with a truly lethal 1440 mF capacitance running at 360 Volts.
Yikes! 1440 milli Farads? (1.4F ) or perhaps 1440 uF (I think). At 360V that is some serious charge.

Don't test that one with your tongue

Steve
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Old 28th November 2009
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Talking Re: "Hydra" FLASH MkII

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Originally Posted by Wreckdiver View Post
Yikes! 1440 milli Farads? (1.4F ) or perhaps 1440 uF (I think). At 360V that is some serious charge.

Don't test that one with your tongue

Steve
Most definatly μF...

Before dismantling and destroying it, I did one last full charge, short circuit "experiment" to see if that was a posibility for photograph...

It was a very big BANG! and I was told not to do it again

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Old 28th November 2009
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Re: "Hydra" FLASH MkII

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Originally Posted by Graham_of_Rainham View Post
Most definatly μF...

Before dismantling and destroying it, I did one last full charge, short circuit "experiment" to see if that was a posibility for photograph...

It was a very big BANG! and I was told not to do it again

Hee Hee......... love it
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Old 28th November 2009
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Re: "Hydra" FLASH MkII

When I t'was a wee lad (many eons ago) my good friend at school use to run a long lead down the garden and connect it to the largest electrolytic he could find. Then he would go indoors and connect the other end to the mains supply Apparently, the resultant explosion was quite dramatic

The neighbours weren't too impressed

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Old 28th November 2009
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Re: "Hydra" FLASH MkII

One word "WOW"
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Old 28th November 2009
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Smile Re: "Hydra" FLASH MkII

So it was not lightening I saw last week!!

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Old 29th November 2009
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Re: "Hydra" FLASH MkII

This obviously resulted in the new tv series Flash Forward. You have ruined the plot
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Old 29th November 2009
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Re: "Hydra" FLASH MkII

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Originally Posted by Graham_of_Rainham View Post
It was a very big BANG! and I was told not to do it again


mouthful of coffee + laughing = mess!
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Old 29th November 2009
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Re: "Hydra" FLASH MkII

Quote:
Originally Posted by Graham_of_Rainham View Post
An additional capacitor bank was also constructed with a truly lethal 1440 mF capacitance running at 360 Volts.
Oh yes... I design flashes for our cameras at work. We use 330uF and 300v and that is serious stuff..

1440uF and 360v?? (energy goes up as voltage squared) You are hereby declared a Very Bad Person

Pete
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Old 29th November 2009
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Re: "Hydra" FLASH MkII

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Originally Posted by gregles View Post
This obviously resulted in the new tv series Flash Forward. You have ruined the plot
I will admit to one small lapse in concentration, when I had removed my rubber gloves, the back of my little finger brushed against a capacitor (fortunatly only one and not fully charged) Had I touched the banks output at full charge it would have been the past flashing by, with not a lot of thoughts for the future.



Quote:
Originally Posted by Ellie View Post


mouthful of coffee + laughing = mess!
Sorry... But if I can make one person laugh each day, I consider it to have been a good one.
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Old 29th November 2009
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Re: "Hydra" FLASH MkII

Quote:
Originally Posted by snaarman View Post
Oh yes... I design flashes for our cameras at work. We use 330uF and 300v and that is serious stuff..

1440uF and 360v?? (energy goes up as voltage squared) You are hereby declared a Very Bad Person

Pete
You can arc weld with that gear

Steve
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