Re: [TCML] Terry Filter

[mddeming@xxxxxxx]

Of course a SGTC will run without any filter, just as a car will run without seatbelts, wipers, or headlights.
There are some of us who would choose not to drive such a vehicle.

Matt D.
"Are you feeling lucky today..."


-----Original Message-----
From: Dex Dexter <dexterlabs@xxxxxxxxxxx>
To: Tesla Coil Mailing List <tesla@xxxxxxxxxx>
Sent: Mon, Dec 21, 2009 5:23 am
Subject: RE: [TCML] Terry Filter


I run my static gap coil without any filter at all.
ST is 5kv/20ma ,and safety gap is set for
he breakdown voltage of aprox 10 kV peak.
've   never saw it arcing so the breakdown 
oltage of my static gap is probably below 9 kV.
osition and way of connecting the gaps with respect to
ST is important.Both gaps should be paralleled with NST.
Dex
--- Gary.Lau@xxxxxx wrote:
From: "Lau, Gary" <Gary.Lau@xxxxxx>
o: Tesla Coil Mailing List <tesla@xxxxxxxxxx>
ubject: RE: [TCML] Terry Filter
ate: Mon, 21 Dec 2009 02:16:43 +0000
If you build a filter with MOV's targeting a 15kV NST, and you use a 9kV NST, 
he MOV's will allow a peak voltage of something like 22-23kV before they kick 
n.  With a 9kV NST, the maximum voltage that *should* be allowed is 9000 x 
.414 = 12726, call it 13-14kV.  So it would be permitting too-high voltages 
hat should have been clamped.  One needs to select the correct number of MOV's 
or the NST voltage used, for the same reason that one needs to set the safety 
ap for each situation.
Regards, Gary Lau
A, USA
> -----Original Message-----
 From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On
 Behalf Of chipford@xxxxxxxxxxxxxx
 Sent: Sunday, December 20, 2009 8:31 PM
 To: tesla@xxxxxxxxxx
 Subject: [TCML] Terry Filter
 
 I have my terry filter about 50% done. While building it, I asked myself a 
uestion.
 Why would a person build anything but a Terry Filter capable of protecting a 
ST of
 15,000 volts? I ordered 14 MOV's from dig-key. For 4 or 5 dollars more, I 
ould
 have had 16. Now if i want enough for a 15k trany, I gotta pay shipping
 again.Correct me if I am wrong. If I build a Terry filter capable of 
rotecting a 15K
 volt trany, I can use it to protect my 9000 volt NST without any 
odifications. I bring
 this up because, as we all know, parts get swapped from coil to coil and if I 
ecide
 to built a larger coil with my 15k trany later on, I could've just moved it 
ver without
 worry. Am I wrong?
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