Re: [TCML] Resistors

[Gary Lau <glau1024@xxxxxxxxx>]

Exactly - the cap value and the NST secondary inductance form a resonant
circuit at or near the 50-60 Hz mains frequency.  If the spark gap is set
too wide, the circuit will ring up to higher and higher voltages on
successive mains half-cycles, and far exceed the unloaded peak voltage of
the NST.  The cap doesn't need to be exactly mains-resonant for this to
happen.  This is why one of the reasons why LTR cap values are chosen - to
minimize the voltage rise should the gaps be incorrectly set.

Regards, Gary Lau
MA, USA

On Sat, Apr 16, 2011 at 3:59 PM, Carl Noggle <cn@xxxxx> wrote:

> HI--
>
> I don't get the concept of a mains-resonant capacitor.  Resonant with with
> inductance?  The secondary of the NST?
>
> Thanks for the enlightenment.
>
> ---Carl
>
>
>
>  That would work, provided that the caps are a suitable variety, i.e.
>> polypropylene dielectric.
>>
>> It appears that you're targeting the mains-resonant cap value of .0061uF.
>> While that will work, it increases the danger of over-volting the
>> transformer and cap should the gaps be set too widely.  A cap value of 1.5
>> -
>> 2X the mains-resonant value is typically used.
>>
>> Regards, Gary Lau
>> MA, USA
>>
>> On Fri, Apr 15, 2011 at 9:10 PM, Cole Awesome-Jordan<
>> jordancole@xxxxxxxxxxxxxxxxxxx>  wrote:
>>
>>  Could one use 1/2 watt 10M resistors with a 10000v 23ma transformer with
>>> a
>>> single strand of 32 .22uF 450v capacitors?
>>>
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