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Re: [TCML] TC Newbie



Hello again, I'm back

Just received, my transformer - I don't really feel like shelling out the
money for high voltage caps (or several lower voltage ones) though. I was
thinking of making a 'beer bottle' salt water cap. The transformer delivers
2x 7.5kv at 40mA. It is a danfoss oil burner transformer. I was wondering if
anyone could provide me with some advice - especially as I have heard that
salt water capacitors can tend to explode when things go wrong...

 All input and help is valued and appreciated

Thanks a lot,

-Matt

On Sun, Nov 30, 2008 at 9:13 PM, bartb <bartb@xxxxxxxxxxxxxxxx> wrote:

> Hi Matt,
>
> I agree with Gary. Use a ground plane mesh under the coil as your ground
> reference. Tie all RF grounded components to this mesh. I would suggest the
> chicken wire or similar. Aluminum foil is a last resort. Something that does
> come in handy for this is a round Rail Road sign. It's a large 30" diameter
> and made of aluminum. I'm not advising to go out and take down a Rail Road
> sign, but often people have similar objects lying around. I have a Rail Road
> sign and a "Do Not Enter" sign which I use from time to time (found them in
> a barn when I lived in MN).
>
> Anyway, something mechanically strong is what I'm getting at. A plate or
> mesh will do fine at providing a counterpoise. A plate is kind of nice since
> you can drill a hole and mount a brass screw for attaching wiring. However,
> a mesh would be best if the primary coil is very near to the counterpoise.
> But if it's up high enough, then a plate would do fine. The reason is that a
> plate can affect the primary inductance if it's too close.
>
> Take care,
> Bart
>
> Lau, Gary wrote:
>
>> I'm not sure that a length of wire, regardless of thickness, is the best
>> choice for a counterpoise.  Think of the counterpoise as one plate of a
>> capacitor, the other being the earth.  A skinny wire paired with the earth
>> will have very little capacitance.  A better choice would be a length of
>> aluminum foil unrolled across the floor, or a piece of chicken wire (wire
>> mesh).
>>
>> Regards, Gary Lau
>> MA, USA
>>
>>
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