I attached a very helpful page on the voltage potential of the Tesla Coil from Xee2. One can see the stored charge is 250,000 times greater in Tesla's bifilar then a standard coil of equal size. I hope he can begin to post to the new thread here at Overunity.
Here's the opening topic sentence:
"2 bifilar Jule Thief coils twisted into a spiral air core torus will output inverted A.C current from the secondary coil at twice the voltage of the pulsed D.C input to the primary. Two skiens of Radio Shack 2 wire speaker wire works well for this kind of A.C. Jule Thief Quadfilar".
Here's a schematic from Jeanna's "Joule Theif A.C. secondary pickup" thread. One can see at a glance that Jeanna's wraps are around a ferrite core. The Quadfilar Spiral is coreless with an aircore that works off self inductance between the wires alone. That amounts to a major and much simpler difference.
Here's another look at JonnyDavro's Piezo A.C. inverter circuit. Notice his costly ferrite core "mains" transformer. How much simpler and cost efficient would the coreless double wind be?
http://www.youtube.com/watch?v=vQglZZB5LLw&feature=plcp (http://www.youtube.com/watch?v=vQglZZB5LLw&feature=plcp)
Quote from: synchro1 on September 17, 2012, 12:09:36 PM
Here's another look at JonnyDavro's Piezo A.C. inverter circuit. Notice his costly ferrite core "mains" transformer. How much simpler and cost efficient would the coreless double wind be?
http://www.youtube.com/watch?v=vQglZZB5LLw&feature=plcp (http://www.youtube.com/watch?v=vQglZZB5LLw&feature=plcp)
I built his Peizo circuit last night almost exactly as he showed. It works and I lit a 120 volt LED light bulb that uses 3 high power LED's rather than a bunch of 5mm LED's. My transformer was only a 24 volt to 120 volt type from a UPS but it still hit 70 volts at around 5KHz which was enough to light that bulb quite bright. I was consuming 3.6 watts at the input. Output was using about 2.8 watts. Neat little circuit and interesting way to get the oscillation with the Peizo (but with mine a bit annoying as it was a bigger and more audible one).
Oddly the single 5mm LED across the transistor never lit and I even reversed it to make sure I had it right and tested it later across 4 volts to make sure it was good. I was also able to run the setup from a small 9.6 volt Nicad pack (looks like a pack of AA's).
@e2matrix,
Jonny Davro's A.C. LED could run with a Quadfilar Inverter Spiral Coil ringed around the screw base. The Piezo buzzer, transistor and tiny battery can all tuck in neatly under the bulb base. This beats trying to hide a bulky five pound ferrite core transformer.