Re: 60 vs. 30 ma

From: 	DR.RESONANCE[SMTP:DR.RESONANCE-at-next-wave-dot-net]
Sent: 	Friday, June 20, 1997 12:53 PM
To: 	Tesla List
Subject: 	Re: 60 vs. 30 ma

To: Alfred

One must exercise caution in considering your statement.  You are assuming
most Tesla coil power transformers are providing current as fast as the
capacitor can charge.  In most all Tesla coil applications that I have
experimented with we have found going from a 30 ma xmfr to a 60 ma xmfr   (
keeping the voltage the same) there is a substantial increase in the output
of the Tesla transformer.  

Your statement is correct but it does assume the smaller transformer is
providing the necessary charging current to match the requirements of the
capacitor.  As an example a .01 MFD cap will (in theory) match perfect with
a 60 ma xmfr, however, if you increase the available charging current to
120 ma the Tesla secondary output will usually increase by 40-50% in most
cases.  Assumptions are made here to assume proper switching (quenching,
etc) is achieved in the sparkgap system employed.

Hope this is of assistance.


> From: Tesla List <tesla-at-pupman-dot-com>
> To: 'Tesla List' <tesla-at-poodle.pupman-dot-com>
> Subject: 60 vs. 30 ma
> Date: Thursday,June 19,1997 7:29 AM
> From: 	Alfred A. Skrocki[SMTP:alfred.skrocki-at-cybernetworking-dot-com]
> Sent: 	Wednesday, June 18, 1997 7:29 PM
> To: 	Tesla List
> Subject: 	Re: 60 vs. 30 ma
> Wednesday, June 18, 1997 8:10 AM Gary Lau
> <lau-at-hdecad.ENET.dec-dot-com> wrote;
> > >Actually you do have to increase the capacitor size if you increase 
> > >the charging current otherwise you will not be using the additional
> > >current. Realize of course this assumes that you were already using 
> > >the largest practical size capacitor for the charging current. The 
> > >capacitor is really the controlling factor as to how much power we 
> > >can cram into a given Tesla coil.
> > 
> > 
> > It would seem to me that if one switches to a transformer with
> > twice the current rating, using the same capacitor, that the
> > capacitor would simply charge up to the spark gap voltage twice
> > as fast.
> You can make all the current in the world available to a capacitor 
> and it is NOT going to charge any faster! To make a capacitor charge
> faster you have to increase the applied voltage! Try and remember the
> old analogies to clearify; current is the quantity of electrons and
> voltage is the pressure the electrons are under. How any electrons 
> you have available wont effect how fast a capacitor charges, but the 
> amount of pressure (voltage) they are under will! If you keep the 
> applied voltage the same but double the available current, you will
> have to double the capacitance to use that available current.