How to infer pinout and winding ratio of this transformer?

Hi, I pulled this transformer from an EL wire inverter and am trying to figure out how to infer:

• Which pins correspond to the primary and secondary coils
• The ratio of the windings
• Any other useful information I can glean.

There are only two markings on the top, none on the bottom. The top markings appear to be "45" on one side and, catty-corner to that, an "H". the pins on the bottom are symmetrically aligned, not offset like some transformers I've seen. I checked the resistance between pins and found:

• Green-to-green: 70 ohms
• White-to-white: 0.4 ohms
• Green-to-white (side marked "45"): 1.0 ohms
• Green-to-white (side marked "H): 68.6 ohms

...for background, I'm trying to implement the circuits described in Disney Research's "Tesla Touch" and "Revel" works (I can't add links because I don't have enough points). The papers call for a flyback transformer that boosts 3-5v to about 300v, which is significantly less than the voltages needed by other plasma- and arcing-related flyback projects I've seen online.

My understanding was that EL wire takes about 600v at similarly small currents, which is why I pulled the transformer from an EL wire inverter. However, I'm having trouble getting reliable performance from the transformer and am hoping with this question to resolve some fundamental questions I have about the component.

AKA

• What test equipment do you have? Aug 11, 2015 at 20:23
• Multimeter and oscilloscope but no function generator (tho I also have teensy 3.1, which has pretty adjustable PWM)
– AKA
Aug 11, 2015 at 21:43
• 70 ohm is HV, 1 ohm is low voltage, 0.4 ohm is useful if you want to make a resonant converter. Or you can ignore it and drive the 1 ohm with a MOSFET using teensy as gate drive. If you decide to make a resonant converter figure out the phasing of 1 ohm and 0.4 ohm. Aug 11, 2015 at 22:31
• Refer to Linear Tech app.note 118 for ideas. Aug 11, 2015 at 22:37
• I wouldn't call this reverse engineering since your aim is not to actually design or build a similar transfomer. You are just trying to infer some characteristics from measurements. Aug 12, 2015 at 2:17