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Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
When trying to measure the winding resistance of those transformers, the high inductance of the secondary can confuse an autoranging digital meter. Tip of the day: Try shorting the primary out when measuring the secondary, it will drop the inductance drastically.
Registered Member #10
Joined: Thu Feb 02 2006, 09:45AM
Location: Bunbury, Australia
Posts: 1424
I will try a blower gap in series first
Thanks for the tip about the meter and inductances. Will have to try that out soon.
My toroid is made up but had an accident - see Mystery photos. Apart from that it should be just what I want. I will put it in a separate thread since it is a bit different.
My TC got wet today with the rains. I still have 10 days left to get it going before the Discovery Channel shoot.
Registered Member #10
Joined: Thu Feb 02 2006, 09:45AM
Location: Bunbury, Australia
Posts: 1424
I got 8 foot sparks for the video shoot. Toroid is a chicken wire covered inner tube. Also has a rotating rod on it as standard. I wasn't able to shoot good pics myself as I was the subject, but my son took these.
Registered Member #10
Joined: Thu Feb 02 2006, 09:45AM
Location: Bunbury, Australia
Posts: 1424
Finally got around to another run when the weather improved and I was able to get off work at a reasonable time (hence the cycle gear). Sparks were still only 8 feet max but I didn't try any tuning due to the short timeframe. So it still needs work. I am about 12 feet from the sparks due to HV cable limitations. Safe but e-fields still give a lot of charge from me to grounded objects. I need an earthed rod in front of me and longer cables.
Registered Member #10
Joined: Thu Feb 02 2006, 09:45AM
Location: Bunbury, Australia
Posts: 1424
Hmmm.. quadruple post but over 48 hours and new info. I now have a safety spark, gap and a small RC filter inside the power supply trolley. Feed is with R11 coax for each HV line 20 feet long, allowing me to run a longer breakout point.
Also had a chance to change the ARSG speed and seems to go best at about ?300 breaks per sec or less. Much slower than my 4 or 6 inch coils.
Tuning with an 11 ft breakout point is down to 36kHz and I am tuning out to the last primary turn. I still have a lot to do to get it running properly.
Nevertheless here are sparks over a 27 foot area. I need to get to 40 ft for a demo later in the year.
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Rebuilding my 18 inch TC
