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STROBES

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jmtipton(at)btinternet.co
Guest

Posted: Sun May 13, 2007 12:05 pm Post subject: STROBES

Hi Bob



I've heard that to buy you're strobe kit too far in advance of fitting (and

running) could be a bad idea: it has been said that the strobes should be

'run up' every so often !!!



Please advise



John

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nuckollsr(at)cox.net
Guest

Posted: Sun May 13, 2007 6:21 pm Post subject: STROBES

At 09:04 PM 5/13/2007 +0100, you wrote:



 	  Quote: 	
		  

<jmtipton(at)btinternet.com>



Hi Bob



I've heard that to buy you're strobe kit too far in advance of fitting (and

running) could be a bad idea: it has been said that the strobes should be

'run up' every so often !!!



Please advise



John


	


   This is a hangar myth that has roots going waaaayyy back into

   the history of the electrolytic capacitors for strobe lamps.

   Yess . . . electrolytics stored for VERY long periods of time

   do lose their "form" . . . and it's prudent to "reform" them

   with specific techniques that involve charging the capacitor

   through a current limited source and perhaps even stepping the

   voltage up over time starting at 50% of rated and 10% steps

   thereafter.



   The quality and capability of capacitors has grown since

   this idea was first cultivated. I've got 400v electrolytics

   on the shelf right now with date codes back in the early 90s

   and I'll bet if I juiced them right now with 400v they would

   be just fine . . . and certainly there are no concerns with

   storing a new system for a mere couple of years.



   My 500v adjustable power supply is loaned out right now

   but when it gets back, I'll drag out some old caps and see

   what their pre and post forming capacity is and how they

   behave during application of normal operating voltages.



   Bob . . .



        ----------------------------------------

        ( "Physics is like sex: sure, it may   )

        ( give some practical results, but     )

        ( that's not why we do it."            )

        (                                      )

        (                 Richard P. Feynman   )

        ----------------------------------------

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