RE: [TCML] New guy

["Dave Halliday" <dh@xxxxxxxxxxxxxx>]

I take it that you are looking for an ultra-high-speed flash for motion
capture?

High voltage, low capacitance and air discharge.

A lot of people use tungsten TIG welding rods inside of a pyrex glass tube
(make @#$% sure it is borosilicate or pyrex!). The 'tickler' coil is wrapped
on the outside of the coil.

Can you provide a link to the website where you are getting your plans? 

You can generate the high voltage with a series of doubler circuits. The
advantage is that this is cheap as each stage has minimal requirements.
Downside is that the current at that voltage is minimal so your recycle time
is slow.

For additional circuitry to trigger, Google the Camera Axe

Usual disclaimers about safety...

Dave

> -----Original Message-----
> From: tesla-bounces@xxxxxxxxxx 
> [mailto:tesla-bounces@xxxxxxxxxx] On Behalf Of Rhys Sage
> Sent: Tuesday, August 25, 2009 11:34 AM
> To: Tesla@xxxxxxxxxx
> Subject: [TCML] New guy
> 
> Hi,
> 
> I'm in the midst of plans to build a Microflash. This is very 
> similar to Tesla stuff so I joined the list.
> 
> First off, I'm not an electronics guru but I try to build 
> things. Sometimes they work, sometimes not.
> 
> At the moment I'm working on a microflash - this is a device 
> which stores a main capacitor of around 5000PF with between 
> 15 and 30KV. This is put into an air gap of about 2.5cm with 
> the air ionised from a 45-50KV pulse via another transformer.
> 
> Right now I have a 12v 4A LCD monitor transformer that I'm 
> going to use as the power supply. I'm putting together a 
> 555-based pulse generator with the aim of putting 12v into a 
> standard car ignition coil to get at least 20KV out for the 
> main capacitor. 
> 
> That's all fine and dandy although not yet built. I've got to 
> get around to that. I have the 555 stuff. The diodes will 
> most likely have to be several microwave oven diodes cobbled 
> end on end to make up my rectifiers. Being somewhat frugal 
> I'll build bridge rectifiers rather than using half wave.
> 
> The 45-50KV pulse will probably come from a high-performance 
> ignition coil. Thus, two coils will be in use. Ideally I'd 
> use the bridge-rectified current for the main capacitor and 
> use two smaller capacitors that combine when fired to produce 
> the trigger pulse but I have no idea how to control the 50KV 
> side. I'm planning to work on the low-voltage side, 
> controlling the 12v end of things to control when the flash fires etc.
> 
> Rhys Sage
> 
> 
> 
> SagePhotoWorld.com
> 
> 
> 
> America's favorite photographer.
> 
> 
>       
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