I agree the two high voltage wires on the trigger transformer should be reversed.
Also usually you will find a red mark on the positive connection of the flash bulb.

Peter



----- Original Message ----
> From: David Duffy (AVD) <david@audiovisualdevices.com.au>
> To: Microcontroller discussion list - Public. <piclist@mit.edu>
> Sent: Friday, July 17, 2009 6:07:42 PM
> Subject: Re: [EE] High voltage opto-coupler
> 
> Jinx wrote:
> >> Is the trigger transformer close to the bulb?
> >>    
> >
> > http://home.clear.net.nz/pages/joecolquitt/flash_proto.jpg
> >
> > I've super-imposed the tracks. It's a fairly simple layout to follow
> >  
> A couple of notes:
> Those tubes are polarity sensitive I've found.
> In my similar design, I used a 470p / 1KV cap in series with tube trigger
> The transformer is incorrect - swap the two end connections
> David...
> 
> -- 
> ___________________________________________
> David Duffy        Audio Visual Devices P/L
> Unit 8, 10 Hook St, Capalaba 4157 Australia
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