RE: [TCML] Advice on MMC

["andrew" <andrew@xxxxxxxxxxxxxxxxxxxxx>]

 Thanks
That makes sense.  
Transformer/tank cap resonance = bad. 
Primary coil/tank cap resonance=good and equal in frequencey to
secondary/topload capacitance resonant frequency.

So I pick a value in the reccommended range for static gap and then use the
dimensions of the primary inductance (number of turns etc.) to tune to the
resonant frequency of the secondary circuit. Is this correct?

Cheers
Andrew

-----Original Message-----
From: DC Cox [mailto:resonance@xxxxxxxxxxxx] 
Sent: Tuesday, 29 December 2009 1:08 p.m.
To: Tesla Coil Mailing List
Subject: Re: [TCML] Advice on MMC

You want to avoid a resonance between your power xmfr and the tank cap, so
usually 1.3 to 1.4 times the resonant value is correct amount to use.

You can run an async rotary, but you definitely need to have a safety gap
connected across it.  For 60 mA and 120 mA xmfrs a multiple tube copper pipe
or hyperbaric gap is best way to go.  If you contact me off list I can send
you the plans for the hyperbaric type gap.  Best performance with nst
systems.

Dr. Resonance




On Mon, Dec 28, 2009 at 3:48 PM, andrew <andrew@xxxxxxxxxxxxxxxxxxxxx>wrote:

> Hi
> I have been using Javatc to help me design my coil. I am currently 
> trying to decide on the correct capacitance value for the tank cap but 
> am a little confused about all the different capacitor values 
> mentioned.
>
> They are:-
> Primary Capacitor uF  ; I am asuming this is the actual tank cap used.
>
> Resonant Cap Size, I think this is the capacitance value that 
> resonates with the transformer at 50 hz.
>
> Power factor cap size,  To correct the PF.
>
> Static gap LTR cap size,   Is this the same as the Tank Cap?
>
> srsg LTR cap size.       ditto but for a Sync gap.
>
> I was planning to use an asynchronous spark gap but from what I have 
> read this is not recommended for coils designed with Java TC, so for 
> simplicity I will go with a multi pipe static gap. My transformer is 
> 4x MOT.  I am building a Terry filter for it.
>
> My question is, what is the best way to use Java TC to estimate the 
> optimum Tank Capacitor size.
> When I know that, I can order my caps for the MMC.
>
> Many thanks
> Andrew Buxton
> Newbie Kiwi Coiler
>
>
>
>
>
>
> Andrew Buxton
> MCSE, MCP+I
> 03 3266740
> 0274357596
>
>
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>

 

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