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Re: Alternative supply for tesla coils
At 08:45 PM 3/25/99 -0700, you wrote:
>Original Poster: "Jeff Corr" <corr-at-enid-dot-com>
>
>>> This is a straight forward design to get 12Kv from 2 2Kv mots. It
>doesn't
>>> use any doubleing. Just a positive & nagative suply on each transformer.
>>> Which are then hooked in series to get 12Kv. I drew a picture to better
>>> explain what I'm talking about.
>>Choad,
>> I will have to look at your circuit more closely later, but it does
>>resemble a voltage doubling circuit to me.
>
>
>It isn't a voltage doubler at all if I understand it right. As Shaun
>explains it, it uses two seperate rectifiers, creating a negative
>supply and a positive one. Both of those supplies in series create
>the total difference. This allowed us to get 7kv from one microwave
>transformer. While it oscillated in a Tesla Coil tank circuit as it was
>supposed too, the arcs of the spark gap pulled too much current
>killing the diodes after a few seconds. Several diodes in parrallel
>should fix this.
I looked at the circuit, and it IS a voltage doubler. The diagram is drawn
funny, but there's no getting around it. The way you described it,
"...uses two separate rectifiers, creating a negative supply and a positive
one...", is the very definition of a voltage doubler. Don't let the
oddness of the drawing fool you. I can rearrange the schematic to yield
the same voltage doubler circuit shown in many reference books such as the
ARRL handbook. If a circuit uses caps & diodes to double the voltage of a
transformer, then it is a voltage doubler, regardless of how it's drawn.
Greg