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Re: Formula Overload or (drowning in math)

In a message dated 96-03-13 14:59:32 EST, you write:

>
>Help! I'm Confused!!
>
>After reading and sorting through lots of messages from this group and 
>the usa-tesla group, and information that I have gathered from 
>ftp://ftp.funet.fi/pub/sci/electrical/tesla/, I am confused.  The 
>formulas that Bert Pool gave and some of the tables that Richard Quick 
>gave for the resonant frequency of the secondary come out very 
>different.  I assume I am doing something wrong when doing the 
>calculations or I'm missreading  what the formulas are for.
>
>Since I have been having a bit of trouble getting my hands on used neon 
>xformers ( was able to get a 12kv 30ma so far), the power supply is 
>still up in the air, but I am still aiming for an output of around 12 to 
>15kv at 120ma.  If I have read correctly, the primary of the Tesla coil 
>would best be made from copper tubing of the inverted conical shape.  A 
>secondary coil of around 6 to 8 inches diameter, a couple of feet high, 
>with Mr. Donut on the top. I would love to get one of the commercially 
>made capacitors but by the time I could get it to Canada it would be 
>very pricey, so thats still up in the air also.
>
>

Tom,

There was a Tesla Math Formulary posted on this list on 10-8-95 with many
useful formulas.  If you need it we can repost it.  If you are building a 6"
secondary, you want to use 22 gauge wire and wind on 900 to 1000 turns.  I
used 6" PVC thin wall, with 5 coats of polyurethane over it and wound on
about 986 turns (winding length 27.6").  My primary is made of 3/8" soft
copper tubing wound in a 30 degree saucer shape with 3/8" spacing between
turns.  It has 14 turns.  A .025 mfd capacitor would work good with that size
coil.  You do need a toroid and could start with something about 20" in
diameter.  I have three toroids that I made myself, each required about 3 - 4
hours to make and cost probably less than $50.00 US.

IF you need more help there is a lot of experience on this list.

Ed Sonderman