[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Resonant frequency of twin coil? (fwd)
---------- Forwarded message ----------
Date: Mon, 16 Jul 2007 08:20:07 +0000
From: Nicolas Alstrup <n_alstrup@xxxxxxxxxxx>
To: tesla@xxxxxxxxxx
Subject: Resonant frequency of twin coil?
Hi,
I havent been able to find any information on this on the web.... I am in
doubt how to calculate the resonant frequency for a twin coil, or rather how
to tune it - any help appriciated....
This is my schematic:
__ __
/ \ /
\
\__/ \__/
| |
-------------------------------------| |-----------|------------------- |
| | cap | | | |
| | c c c c
o o c c c c
HV in spark gap c c c c
o o c c c c
| | c c c c
| | | | | |
----------------------------------------------------|------------------- |
|_____________|
And these are my specs:
Secondary coil:
Each SC consist of apprx. 780 turns of 0,315mm wire. Diameter 60mm, height
270mm
Calculated selfcapacitance= 4,282pF
Top load: Sphere, radius 120mm, calculated C=13,466pF
Calculated resonant frequency for each coil: 444,257 kHz
Primary circuit
HV input, NST: 8000V , 50mA
MMC capacitance: C=0,0204uF
Flat Helical coil: inner diameter: 70mm, Wire diameter: 2mm, wire spacing:
1mm
My question now is: How many turns on each primary coil? Should I just
calculate the resonant frequency as if there were just one secondary and aim
at 444,257 kHZ (that is around 7 turns) or how to do it?
Thank you very much for any help,
sincerely Nicolas Alstrup
_________________________________________________________________
Vælg selv hvordan du vil kommunikere - skrift, tale, video eller billeder
med MSN Messenger: http://messenger.msn.dk/ - her kan du det hele