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Re: [TCML] Terry filters



Hi Bill,

I'm a bit more awake and you're math looks correct to me ;^))
So the power wasted by the Terry filter resistors appears to ne-
gligable, especially in comparison to the SG losses (~25%).

David Rieben


----- Original Message ----- From: "Bill Lemieux" <gomezaddams@xxxxxxxxx>
To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
Sent: Sunday, December 30, 2007 12:32 PM
Subject: Re: [TCML] Terry filters



On Dec 30, 2007, at 12:15 AM, Neal Namowicz wrote:

Hello everyone,
Just a question about terry filters, since the topic seems to be cropping up a lot lately. How much loss is there when using them? I'm no EE, but any time I see the main power coming in going through resistors, there must be some loss.

power dissipated in a resistor = the square of the current X resistance

So, for a TF with 1kΩ resistors, and a 15kV / 30 ma NST short-
circuited by the spark gap, we dissipate 0.9 watts in the resistors,
or 0.2% of the transformer's power.

With a 15kV / 120mA NST driving a short through the filter, we
dissipate 14 watts, or 0.8% of the transformer's maximum power.

(somebody check my math, I'm still waking up this morning)

Also, are the TF's "one size fits all", or can the components be sized to correspond with how much potential power you have coming in? It seems that we endeavor to eliminate "lossy" components. "Using beer bottle caps? Replace them with an MMC." Don't use a dimmer switch, too "lossy", etc. Ultimately, is using a TF a trade- off between loss and protection? Kind of like driving a newer car that comes with a mandatory explosive device (air bag) in the steering wheel. "But it's for your protection!" Just one of a number of reasons my two vehicles are 1964 and 1980 Chevys. The k.i.s.s. principle, and no bombs staring me in the face. But I digress, sorry. So, what do you think about the terry filters?

Neal.

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