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Re: [TCML] Strike rail hits and loud bangs
In cases where I've experienced bangs, it appeared the safety gap was
producing the bang. In many cases, this was associated with anomalies
such as rail to primary flash-overs and racing sparks running down to
the ground at the bottom of the secondary (both of which are tied to the
safety gap and both can also be tied to the main gap via the primary).
In this particular case, I couldn't tell if it was a racing spark or a
primary flash as it was on the back side. But considering the brightness
and reflection, it may have been a racing spark as it did illuminate the
entire back side of the coil. I have sometimes wondered if these high
voltage breakdowns to ground had altered the gaps ability to fire
(causing a mis-firing or two) allowing the cap to charge higher and as a
result a following safety gap breakdown (thus the flash and bang). From
the video however, I could not make out the bang well enough or play
with the video enough to note a difference in time between flash and
bang. This theory would support higher occurrences of safety gap
breakdown with higher coupling and with mis-tuned coils.
Lau, Gary wrote:
In my experience, loud bangs are the safety gaps firing, due to the presence of a too-high cap voltage, so the safety gap discharges the bang instead of the main gap. If the safety gap is firing just because of a primary strike, I wouldn't think that it would be nearly so loud, as the current is many times smaller than if the gap is discharging the primary cap into the tank circuit. Could it be that there was a too-high cap voltage, the safety fired for that reason, and the larger than normal bang caused a longer than normal secondary spark to strike the strike rail?
Regards, Gary Lau
From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On
Behalf Of David Nelson
Sent: Thursday, October 02, 2008 10:24 AM
To: Tesla Coil Mailing List
Subject: Re: [TCML] Strike rail hits and loud bangs
Is there a chance that the loud bang is a spark between bottom of the
secondary and the inner turn of the primary? Overcoupling. I had this and I
removed half a turn from the inside of the primary and re-routed the wiring
(down and out) to fix the problem. I kind of feel that performance went down
slightly, but no more loud, annoying and scary bangs.
----- Original Message -----
From: "Stephen J. Hobley" <shobley@xxxxxxxxxx>
To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
Sent: Wednesday, October 01, 2008 11:37 AM
Subject: [TCML] Strike rail hits and loud bangs
We have a fairly simple coil using a 60ma NST. Recently I changed the tap
point on the primary and by chance hit a really sweet spot.
Usually the Tesla Tuner is pretty accurate and gives good results, but in
this case it did not indicate that this tap point was a good one.
The streamer length has increased by at least 50% - but we did notice some
rather worrying "bangs" from the Terry filter spark gap when the strike rail
is being hit. Is this normal?
Is it possible to tune a Tesla coil into a self-destructive state?
I would take some pictures, but the darned thing scares me to death...
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