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Re: 60 vs. 30 ma




From: 	Malcolm Watts[SMTP:MALCOLM-at-directorate.wnp.ac.nz]
Sent: 	Thursday, June 26, 1997 6:44 PM
To: 	Tesla List
Subject: 	Re: 60 vs. 30 ma

Hi Peter,
 
> From:   Peter Electric[SMTP:elekessy-at-macquarie.matra-dot-com.au]
> Sent:   Thursday, June 26, 1997 5:29 AM
> To:     Tesla List
> Subject:    Re: 60 vs. 30 ma
> 
> Tesla List wrote:
> > 
> > From:   Rick Holland[SMTP:rickh-at-ghg-dot-net]
> > Sent:   Monday, June 23, 1997 11:13 PM
> > To:     Tesla List
> > Subject:        Re: 60 vs. 30 ma
> > 
> > --
> > Forget rivers. We're talking electronics. The formula for attaining 63%
> > of maximum charge (ie. applied VOLTAGE) in terms of time is R*C. The
> > number of time constants required to approximate full charge is 3. In
> > order to decrease the amount of time necessary to charge the capacitor,
> > you must decrease R or C or increase voltage. In the event you increase
> > voltage, the resultant 63% will be that fraction of a higher voltage.
> > Increasing current and leaving all other factors even will not decrease
> > charge time or increase charge per time unit.
> > 
> >       Rick Holland
> > 
> >       The Answer is 42
> 
> How can you possibly increase current without decreasing R? The current
> from a Xformer is limited by the R of the windings. If this is decreased
> the the product of R and C will indeed decrease so your cap will charge
> and fire more often.

In most Tesla systems, cap charging is determined by inductive 
elements and timing. In the case of neon sign transformers, leakage
inductance and the primary cap are by far the major determinants of 
charging behaviour.

Malcolm