I actually started out with the microwave transformer. I feel uncomfortable using the microwave transformer because it can deliver 1 amp at 2kv. They also run on full saturation mode and trip my breaker every two minutes. The ballast only pulls 0.43 amps when completely shorted so I don't have to worry about blowing breakers. I am currently looking for a neon sign transformer for it, but until then, I only have flyback transformers. They are good because they don't deliver a whole bunch of current. The ballasts are good too because they don't push a whole lot of current into the flyback and burn it up. A ballast is perfect for my application. Woodburning uses a mixture of baking soda and water soaked into the wood to make it more conductive. As for the 277 supply, could I pick up a 120/240 to 24vac at my local home Depot or Lowe's or my electrical surplus store or would I have to order it? If I supply 24vac to it's secondary to get 240 then have another transformer with a 32 volt secondary wired in series with the 240 volts to make 272 volts?