Re: coil questions
At 11:07 PM 7/22/99 -0400, you wrote:
>Terry, as always, thanks for the detailed reply.
>I found the RC filter on your web site. What wattage resistors would
>you recommend for a 15/60 NST? You said you used 250W but that it was
>overkill. Where can I find 30KV caps? I tried Digikey and couldn't
>find anything. Also, what about a filter on the 120V side of the neon?
I use 5k ohm 50 watt resistors. Some people say they get really hot while
I and others don't seem to have that problem??? they "should" work fine
but realize that they normally can run about 300C. They are basically like
ceramic space heaters so plan on them getting really hot.
The caps really only need to be 15kV each in retrospect. I would just go
the the MMC approach. My new filter has five 1600 volt 10nF caps in series
to give a 8000 volt 2nF cap (I run them over voltage :-)). You could use
10 1600V 10nF caps to get a 1000pF 16000 volt cap. Dr. resonance also
usually has high voltage door knob caps too.
All the stuff about MMC primary caps can easily be applied to filter caps
too. Since the currents are very low you will always need only one string.