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Re: Double Throw Spark Gap (fwd)
---------- Forwarded message ----------
Date: Wed, 10 Oct 2007 20:56:55 -0700
From: Barton B. Anderson <bartb@xxxxxxxxxxxxxxxx>
To: Tesla list <tesla@xxxxxxxxxx>
Subject: Re: Double Throw Spark Gap (fwd)
Hi Chris,
I admit I still have some study to do regarding your mechanical
approach. I've just been a wee bit busy with other off-list things
lately. When I'm referring that I don't understand the mechanics, I mean
mechanics in terms of how the arc will quench on the firing mode (as
hoped) and how this will affect the recharge time, etc. With high
voltage energy like this, the arc will start "and finish when it's
finished" and not necessarily when you wanted it to. Such are the
problems with this high voltage hobby. But, I'm hoping to learn
something new here!
You brought up an interesting question: What type of loss do we actually
see with the transformer periodically shorting? I'm unsure about that. I
have never thought much about it, but it could be a fair amount. So I'm
hoping for all the best with this experiment. Chris, it's this type of
experiment that the TCML is all about! Glad to see you working on it!
For better or worse, it's one of the most interesting I've seen in a
long time.
Take care,
Bart
Tesla list wrote:
> ---------- Forwarded message ----------
> Date: Wed, 10 Oct 2007 15:38:41 -0500
> From: Crispy <crispy@xxxxxxxxxxx>
> To: Tesla list <tesla@xxxxxxxxxx>
> Subject: Re: Double Throw Spark Gap (fwd)
>
> Bart,
> The mechanics are fairly simple - I posted pictures earlier, if that
> helps. A rotary contact just switches between two different sets of
> stationary contacts.
>
> On an unrelated note,
> Someone mentioned that this could be used with an unballasted power
> supply. Although this would theoretically work, I wouldn't recommend
> it, "just in case". If something went wrong and shorted out the supply,
> bad things happen.
>
> On yet another unrelated note,
> Does anyone have any feedback on my initial proposition of seriesing a
> static gap in the charging circuit to pulse power? My goal for this
> project was to get the largest sparks possible while still staying
> within my dorm's 600 watt power limit. The DTSG should help eliminate
> losses involved in shorting out the power supply while the gap fires,
> but the difference this makes probably wouldn't be too big. Pulsing
> power (at a layer in addition to the normal disruptive discharge) could
> increase spark length, however. My idea is to add a mechanism to
> disrupt power at a lower frequency (say, 5Hz or less) in the charging
> circuit.
> In the schematic at
> http://tangent.cluenet.org/~chules/hv/tesla/ardtsgschem1.png , my basic
> idea can be envisioned by adding a switch between the HVDC power supply
> and the de-Qing diode. When this switch is open, the "smoothing
> capacitor" would be allowed to charge to essentially full capacity.
> When this switch was closed, the power available to the charging circuit
> would be the power of the direct supply added to the stored energy in
> the smoothing capacitor. With a ballasted supply, this would allow for
> much higher ARSG break rates and larger tank capacitors than would be
> plausible with just the supply itself, and therefore longer sparks for a
> given average power input.
> Such a high voltage switch would be possible to make, but would only
> yield one "visible" (as soon by an observing human) spark per switch
> contact. I've been considering different mechanisms, and I'm wondering
> if a single unquenched static spark gap would work, due to residual
> ionized trails. Any thoughts? I've also considered a high voltage
> relay.
>
> Chris B
>
> On Wed, 2007-10-10 at 08:07 -0600, Tesla list wrote:
>
>> ---------- Forwarded message ----------
>> Date: Tue, 09 Oct 2007 21:44:55 -0700
>> From: Barton B. Anderson <bartb@xxxxxxxxxxxxxxxx>
>> To: Tesla list <tesla@xxxxxxxxxx>
>> Subject: Re: Double Throw Spark Gap (fwd)
>>
>> Hi Adam,
>>
>> It's going to charge in the low millisecond range and discharge in the
>> low microsecond range (in a Bang!). No doubt about that. Electrically,
>> he's attempting to separate the charge circuit from the discharge
>> circuit. But I don't completely understand the mechanics of how this can
>> be done. I'm just sitting back to see what comes of this experiment.
>>
>> Take care,
>> Bart
>>
>> Tesla list wrote:
>>
>>> ---------- Forwarded message ----------
>>> Date: Tue, 9 Oct 2007 03:46:42 -0700 (PDT)
>>> From: Yurtle Turtle <yurtle_t@xxxxxxxxx>
>>> To: tesla@xxxxxxxxxx
>>> Subject: Double Throw Spark Gap
>>>
>>> I haven't really been following this thread, so
>>> forgive me if this comment has already been addressed.
>>>
>>>
>>> Regarding the following circuit:
>>>
>>> http://tangent.cluenet.org/~chules/hv/tesla/dtsg.html
>>>
>>> Does everyone think the cap can charge adequately in
>>> the same amount of time it can discharge? Without
>>> doing the math, I gotta believe that if one set of
>>> flying electrodes zooms around at several hundred rpm,
>>> the presentation time for the charging portion will be
>>> too short to fully charge the cap. After all, most rsg
>>> coils are charging the whole time they aren't
>>> presenting (well not exactly). I guess you gotta know
>>> the dwell time and the size of the pig feeding this.
>>>
>>> Adam
>>>
>>>
>>>
>>> ____________________________________________________________________________________
>>> Boardwalk for $500? In 2007? Ha! Play Monopoly Here and Now (it's updated for today's economy) at Yahoo! Games.
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>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>
>>
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