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Registered Member #95
Joined: Thu Feb 09 2006, 04:57PM
Location: Norway
Posts: 1308
Check out this find, a solid state spark gap! I found it while harvesting a monitor, near the flyback. It says 1Kv, is that the maximum voltage, or where the spark gap triggers? Has anyone seen, used or heard of one before?
A 1Kv reliable spark gap? Sounds like I can make an uber low voltage SGTC!
Registered Member #95
Joined: Thu Feb 09 2006, 04:57PM
Location: Norway
Posts: 1308
Oh, I forgot to mention that it was labeled as SG1.
I guess it would be pretty weak, maybe I could use in a micro-power tc, one that runs of a wall wart or something. Any idea what it was for in the monitor?
Registered Member #89
Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145
I have some real gas-arrestor sparkgaps wich work on low voltages (300..600V). They look like small ceramic barrels with mtimesetal plates on sides (somes in the middle too if it is double arrestor)ra
It can handle high peak currents from lightning strikes etc. but I doubt it would live for long in small TC operation (geftets very hot with RMS current of just few tens of miliamps)
Another problem is that small TC's simply won't work with that low tank voltages - same reason why miniature OLTC's aren't feasible.
With high resonant frequencies you want highest possible tank voltage, otherwis you would run deeply into tank energgy troubles and less-than-one primary turn problem.
Registered Member #135
Joined: Sat Feb 11 2006, 12:06AM
Location: Anywhere is fine
Posts: 1735
A long time ago I had some real mini spark gaps from old VT TV's. They were maybe 1mm gaps on a small ceramic substrate glued in place with some ceramic cement. They were pretty neat little gaps, but not for repeated strikes, they were safety gaps.
The gas tube surge arrestors are pretty cool too, although they do not fire at high enough AC voltages to be useful unless you have 30 or so. I wanted to use 3kvdc surge arrestors for my big TC project, but the tubes clamped at a low 600 VAC or so. At $5 each it was far too expensive. I think I needed 14 per leg of my transformer to give me the protection I wanted, so I'm relying on the doorknob caps as my protection plan.
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SS spark gap
