Re: [TCML] Terry filter quick questions

[jhowson4@xxxxxxxxxxx]

Woops, that 1000K was supposed to be a 1K. 

Alright so the resistors are needed for the operation of the filter, and it looks like I need to find some 1K ones. 

One thing I am confused on that seems to pop up regularly on the internet, is that terry filters are not intended for anything except NST's 
Why is that? is it not possible to apply the same principles to regular transformers such as a PT, with a slightly modified circuit? 
These guys seem to be doing what I am talking about with a PT. http://www.tb3.com/tesla/teslathon2003/tb_tc/tb_tc.htm 
Any one have a schematic for what they are using? 

Gary..Great site. Thanks 

Thanks again , 
John "Jay" Howson IV 


----- Original Message ----- 
From: "Gary Lau" <glau1024@xxxxxxxxx> 
To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx> 
Sent: Thursday, June 3, 2010 8:52:30 PM GMT -05:00 US/Canada Eastern 
Subject: Re: [TCML] Terry filter quick questions 

1) If both wire-wound and film resistors were available with 
comparable ratings, I would choose film, but I don't think I would be 
able to justify that, analytically. Since 100W film resistors are 
rather uncommon, wire wound units are commonly used. 
2) The resistors, in combination with the caps, form a low-pass R-C 
filter, to attenuate VHF high voltage transients from getting to the 
NST. The resistors without the caps would not do this; the resistors 
must be used with the caps. The long story if available on my NST 
protection circuit web page: 
http://www.laushaus.com/tesla/protection.htm 
3) The recommended resistance is 1000 Ohms or 1K Ohm, not 1000K Ohm. 
A 100 Ohm resistor would not be effective, and a 1000K (1Meg) resistor 
would waste more power than it passes. 

Regards, Gary lau 

On Thu, Jun 3, 2010 at 8:01 PM, <jhowson4@xxxxxxxxxxx> wrote: 
> Hey guys, quick question on terry filters. 
> 
> 1) Are wire wound or film resistors preferred 
> 2) What exactly is the purpose of those big resistors . 
> 3) Is the 1000Kohm rating imperative? I have some 100W 100ohm resistors...Will these work? 
> 
> Thanks in advance, 
> John "Jay" Howson IV 
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