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Re: [TCML] static gap singing coil hybrid.

After just a short jaunt through the archives I found little of use as far as actual designs, but there is so much there I would have to spend a great deal of time fishing through it to find the meat. In any event I am going to try the glass tube (because I have a good tube, and it would look dang cool.) The design I have in mind will use a hollow Pyrex glass tube, 2-inches in diameter, with a 3 mm wall thickness, it will be plugged on both sides with the spark gap electrodes with a hole in the center of them (to blow air through the tube for quenching and cooling.) The trigger will be a flyback (cause I have them on hand) lead going to aluminum tape around the outside of the tube, apply power to the flyback and charge the inside surface of the glass allowing the spark gap to fire. Because Pyrex laughs at heat, and I can't cut this stuff even using my oxy mapp gas torch (granted it is a small torch) with the arc randomly happening on any given point of the inside glass surface I should be fine temperature wise. Now I just need to learn to interface a midi device with a flyback, this will require heavy research... 

On 1/25/2011 10:37 PM, jimlux wrote:

On 1/25/11 3:55 PM, Scott Bogard wrote:

Phillip,
I was planning on eventually building a DC coil eventually anyway, and I
have enough microwave oven capacitors and diodes that I could build a
MOT based level shifter with all the current I can handle, not sure if
that would cut it or if I would need a resonate charging inductor, which
could be made with more MOTs in theory. Since it is triggered it
shouldn't need an especially high voltage I suppose, so 4kV was where I
was aiming. The biggest hurtle I see is cooling, having that arc that
close to glass for prolonged periods will be tricky, but maybe if I run
cold air or oil or even water through the tube, its life expectancy
should be similar to glass jar capacitors I'd imagine, even if I only
get 15 minutes out of it glass tubing is a lot cheaper than IGBT's, and
is easy to replace...





Search back through the archives and you'll find that more than one
person has done a triggered gap. You don't need the glass tube, for one
thing. I'd use an auto ignition coil as the trigger pulse source. You
know it can handle audio rate pulses, and you might be able to repurpose
some sort of magnetic pickup ignition with an opto isolator to make life
easy.

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