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Registered Member #1652
Joined: Mon Aug 25 2008, 04:47PM
Location:
Posts: 24
Its funny you brought that up cause I just fried my second transformer. Any suggestions as to why that may have happened, and where to by a good replacement.
Registered Member #1389
Joined: Thu Mar 13 2008, 12:50AM
Location: Pittsburgh, PA
Posts: 346
To elaborate Coronafix's answer, you are getting some high voltage feedback into your transformer, causing the insuation between winding layers to break down, and hence, destroying your transformer. A safety gap prevents this by allowing voltages higher than the transformer outputs to be safely disapated across it, like the spark gap of the Tesla Coil. Just put the output terminals across another spark gap before getting to the tank circuit (a simple 2 electrode type is all you need, your origonal gap widened a bit is probably perfect!), and set the gap just wide enough that it does not fire when the transformer is energized. This way, when a pulse of higher voltage is fed to the transformer, it simply jumps the safety gap, instead of your transformer's insulation.
Registered Member #1630
Joined: Sat Aug 09 2008, 11:36AM
Location: Seoul Korea
Posts: 115
M_Ling wrote ...
Its funny you brought that up cause I just fried my second transformer. Any suggestions as to why that may have happened, and where to by a good replacement.
Transformer: 6.5KV 20ma
You need a safety gap, 2 wire round 100 ohm resistors and filter caps across your transformer. You can easily get 6.5Kv 20mA NSTs for maybe at most $10?? ... I would go to 6.5Kv @ 60mA for more juice!
You need to run a safety circuit (filter) to get out feedback going into the windings of the transformer. feedback will cause inter-arcing and will KILL the transformer. The safety gap needs to be a 3 gap. The middle gap goes directly to ground of the transformer.
Also I might change the design of you coil a bit and run the transformers outside of the box. There is a hefty magnetic field within about 3 ft of the coil while it's in operation, having the transformers so close is probably not a good thing for them. Run an external PSU/Power supply unit and this might be a better idea. Just a thought.
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250,00v table top tesla coil. Help!
