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RE: Won't someone PLEASE help me?



Original poster: "David Dean by way of Terry Fritz <twftesla-at-uswest-dot-net>" <deano-at-corridor-dot-net>

Hi Garry,

snip
>
> All I ask is if someone can help me figure out a MOT setup I
> could use for this
> telsa coil. Otherwise it is going into the trash and I am going
> to give up this
>
snip

See www.corridor-dot-net/deano/mot_power_supply.htm for some Ideas.
The double level shifter would probably work with your current filter
network and MMC.
Another alternative would be two MOTs with the outputs in series as found
near the top of www.corridor-dot-net\deano\MOT2.htm adding a third MOT with the
secondary shorted in series with the power input to add some current
limiting. The voltage in this configuration is rather low, which has some
special problems of its own. In order to get enough power into the coil to
do any good you need a much larger tank cap. Using a MMC makes it easy as
all you have to do is reconfigure the MMC. Using the .056uF 1600VDC
polypropylene caps from Digikey for an example, make the strings three caps
long and as many strings as you have caps to make. Or to go the EMMC route,
just make the strings two caps long. The primary will have to be tapped in
to be resonant at the desired frequency with the much larger cap value, so
the "surge impedance" will be higher resulting in greater gap losses and
lower efficiency. But you will have plenty of power to make up for those
losses. Another problem you will have is gap heating. The number of gaps
will be less, (assuming a multi static gap) and the spacing will probably
have to be closer. The gap will have to have a lot of airflow to keep it
cool and to remove hot ions. No filter network will be required with this
setup, in fact it would probably not work well, if at all, with one.

The double level shifter circuit would most likely work best with a SRSG
running at 60 BPS. Marco had a webpage with a practical design of this type
that worked rather well a couple of years ago. I do not have the URL,
perhaps someone on the list does?

Like you, I have not had much good luck with NSTs. That is why I use a pig.
I have been planning to do the two MOTs in series large value/low voltage
cap thing for a while, however it will have to wait till I can afford to
spring for more caps. Just too many bills to pay this time of year.

later
deano