Re. Need some input (bypass cap/safety gaps)
>>>do i really need them?
>>>whats a good Mh/Uh
>>You will no doubt get several different answers to this. I say no,
>>chokes in a protection network eliminate one problem (they're good at
>>filtering out the tank frequency) but create another comparable problem
>>(they will ring at their own self-resonant frequency). Instead, use just
>>an R-C network in each leg of the NST. C=300-800pF in parallel with
>>safety gap, R=1K-10K, 50-100W between NST terminal and main spark gap.
>>Regards, Gary Lau
>>Waltham, MA USA
>Original Poster: "Coiler" <mycroft-at-access1-dot-net>
>Parallel with SG??? Don't you mean to ground from each leg? (in parallel
>would work for those of us using non-centertapped transformers)
>Coiler, Homebrewer, Nerd. mycroft-at-access1-dot-net
The bypass cap in an RC low pass filter would be across the output of the
NST, from hot terminal to ground, as would be the SG's (safety gaps).
Thus, the safety gap is in parallel with the bypass cap. For
center-tapped xfmrs, there would be two sets of gaps/caps, both with one
side groundedd. For a non-center-tapped xfmr, one side of the xfmr would
be grounded so only one set of safety gap/bypass caps is necessary.
Regards, Gary Lau
Waltham, MA USA