RE: Maggies and such

["Duke, Ronn (CCI-San Diego CCC)" <Ron.Duke-at-cox-dot-com> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)]

Since it is preferable to have the maximum power available in a magnifier,
wouldn't it be better to have a DC power supply feeding it? You would be
running a variable RSG anyway, so it would not be limited by the AC sine
wave. You could adjust capacitance (by adding or subtracting strings on an
MMC) to the break rate for best performance. Is this possible?
 
	Original poster: "Malcolm Watts" <M.J.Watts-at-massey.ac.nz> 

	On 15 Aug 00, at 10:58, Tesla list wrote:

	> Original poster: "sundog" <sundog-at-timeship-dot-net> 
	> 
	> 
	>  Hi all!
	> 
	>   A question on magnifiers....
	> 
	>     I am guessing that the secondary and tertiary coils have to be
at the
	> same resonant freq.  Makes sense to me that they would be.  But
will having
	> different inductances (a big fat driver with mediocre turns and a
tertiary
	> that's wound with finer wire for more turns so they have the same
res.
	> freq)..ideas?  I'm wanting to get the surge impedance down on the
driver so
	> it can be coupled tighter.  Yep, gap losses go up, but this is for
	> examination more than long sparks.

	The coils do not have to run at the same frequency. For a 
	conventional slap-it-together system (i.e. without Dr de 
	Queiroz's special k's incorporated) you treat the 
	secondary+tertiary as a single entity and tune the primary to 
	the combination. The voltage rise across each will be in 
	proportion to each coil's contribution to the total 
	inductance. You can couple the primary as closely to the 
	secondary as you like but overall coupling is determined by 
	the proportion of total inductance coupled to the primary 
	(i.e. going for k=0.6 in the driver is not going to score you 
	an overall coupling of 0.6 - far from it in fact).  Your 
	sparklength is pretty much dependent on how much power makes 
	it to the secondary+extra coil and the peak voltage the system 
	reaches, so going for low losses in the primary is still a 
	good idea.

	Regards,
	Malcolm