On 10/4/07, Jinx <joecolquitt@clear.net.nz> wrote:
> About the circuit here -
>
> http://sound.westhost.com/project65.htm
>
> Is there any reson why I couldn't use an X2 capacitor instead of
> a current-limiting resistor ?

If you're talking about R3, then you've forget everything is happening in DC.
C3 is charging with the energy already accumulated on C1/C2 which must
be high, so you can't limit the current in AC.

 If so, I would use the impedance of
> it as the effective resistance to get the charge time for the storage
> cap ? I have a selection of X2 caps from 47n to 2u2
>
> The set-up I'm planning is fairly small. 240V mains, 5W or less
> tube flashing at no more than 1Hz (probably)
>
> A long time ago I repaired a biggish stage flash, and that had, ISTR,
> only 4uF in a metal can (cigarette packet size) with screw terminals.
> It seemed bright enough, so I wonder what type of tube the author
> is thinking of that needs 200uF
>
> Pretty sure the old ETI strobe used only a few uF as well, but can't
> lay my hands on the article to check the tube wattage
>
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