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Re: Resonant frequency of twin coil? (fwd)
---------- Forwarded message ----------
Date: Tue, 17 Jul 2007 03:18:41 +0000
From: Nicolas Alstrup <n_alstrup@xxxxxxxxxxx>
To: tesla@xxxxxxxxxx
Subject: Re: Resonant frequency of twin coil? (fwd)
Hi Finn,
cool, thank you for your help ;-) Ill try with that.....
I live in Copenhagen....
(Danish: Rart at høre fra en anden dansk coiler ;-) Dette er min første
coil.....)
Sincerely Nicolas Alstrup
>From: "Tesla list" <tesla@xxxxxxxxxx>
>To: tesla@xxxxxxxxxx
>Subject: Re: Resonant frequency of twin coil? (fwd)
>Date: Mon, 16 Jul 2007 21:09:33 -0600 (MDT)
>
>
>---------- Forwarded message ----------
>Date: Tue, 17 Jul 2007 01:36:02 +0200
>From: Finn Hammer <f-h@xxxx>
>To: Tesla list <tesla@xxxxxxxxxx>
>Subject: Re: Resonant frequency of twin coil? (fwd)
>
>Nicolas.
>
>Your resonant frequency in the tank is the same as the secondary res. freq.
>
>Keep in mind that the primary inductance is divided in 2, so that 1/2 is
>in each primary coil. This means that each primary coil should have 1/2
>the total inductance.
>There is going to be some inductance in the wires between the tanks
>also, so my guess is that the coils woll tune with around 3,5 - 4
>primary turns.
>
>Whereabouts do you live? I`m in the Hobro area.
>
>Cheers, Finn Hammer
>
>Tesla list skrev:
> > ---------- 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
> >
> > _________________________________________________________________
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> >
> >
> >
> >
>
>
>
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