Re: DC? was: mechanical bridge rectifier

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Malcolm Watts by way of Terry Fritz <twftesla-at-qwest-dot-net>" <m.j.watts-at-massey.ac.nz>

HI Josh,
         All transformers *require* a changing magnetic field to work.
A classic disruptive TC does this by discharing a cazapitor through
its primary inductor. At the instant the gap fires, the cap doesn't
care whether its been charged from an AC or DC source. In CW
situations (which is essentially what mains is), an AC source is
required. Could be sine, square or triangular or some combination
thereof.

Malcolm


On 20 Nov 2002, at 11:57, Tesla list wrote:

 > Original poster: "J Dow by way of Terry Fritz <twftesla-at-qwest-dot-net>" 
<jdowphotography-at-hotmail-dot-com>
 >
 >
 >
 >
 >
 > Good evening folks
 > Recently I asked about rectifying AC on the low side of the mane
 > transformer in a TC.
 > The answers from the list were a resounding NO it can’t be dun.  So then if
 > DC is bad for transformer action why is it ok for HV TC work? The TC (pri ­
 > sec) is just a transformer.
 > Why is DC bad for one kind of transformer and not for another?
 >
 > And- hey thanks for the Mechanical rectifier replies! As I am into super
 > cool looking things I may try one out. I was imagining a supped up spark
 > gap used as the SRSG and the rectifier at the same time. It would be on an
 > 1800-rpm motor with 12 electrodes. 4 for the SRSG and 8 for the rectifier.
 > I don’t really think it will offer much in the way of performance but it
 > will sure be fun. And that’s the point.
 >
 > Read you all later
 > Josh
 >
 >
 >