[NewCandle] More FYI

[Keith Nagel]

This seems more of a fortuitous coincidence; junction capacity
is nonlinear and at 4pf it's of the same order of magnitude as
the various stray capacities in the circuit. That said, in a
very high impedence secondary the secondary is starved for
capacity so ALL capacities in the circuit are going to have some effect.
To prove his theory, he should put pairs of diodes either
in series ( to halve capacity ) or parallel ( to double it )
and measure the resonance.

In my experiment with the diodes, I used a secondary with
a great deal of interturn capacity, swamping out everything
else. This is why I can ground one end of my secondary and
not see a change in fundamental resonant frequency. It's
a true parallel resonator. In Mark's circuit, it's probably
more the case that the capacity of the whole secondary
+ whatever's attached w/ respect to ground is the resonant
circuit. This is a little more like a series resonant circuit.
Hence his observation of a mode switch from 1/2 wave to 1/4
wave when he grounds one end. I suggested this mode switching
phenomena to George last week, and I'm delighted that Mark
is demonstrating that in his circuit. 

K.

-----Original Message-----
From: newcandle-bounces at ipdiscover.com
[mailto:newcandle-bounces at ipdiscover.com]On Behalf Of Jones Beene
Sent: Saturday, November 03, 2007 1:06 PM
To: New energy for the new world.
Subject: [NewCandle] More FYI


More on the diode from Mark S:

The fundamental resonance appears to come from the inductance of the 
secondary and the junction capacitance of the IN4148 diodes. I have 
attached the datasheet here. The secondary sees a complex capacitance 
from the two AP diodes -- however even a sinple LC resonance calculation 
shows that the figures agree pretty well. Here is a link to a good LC 
resonance calculator http://www.pronine.ca/lcf.htm.  If you want to tune 
further then set up a resonator on the primary side for the same 
frequency...

You could try to tune the two just out of phase -- this will result in 
the power beating between the input and output -- exactly the same as in 
good tesla coil design. This may work better than exact tuning as the 
total power transfered wont be any less but the higher voltages at the 
AP may reduce losses in power transfer there. It's hard to predict and 
the tight coupling of the primary and secondary may limit this approach.

Whatever you do -- tuning the primary side to the same frequency will 
certainty reduce losses in the AP and improve power transfer.

cheers

mark.