flatulent,
This is a working product, I bought it and used it myself, my dad was so please to have it and zapping all the annoying mosquitoes in the evening.
It basically uses 2x 1.5V cells going through a DC-AC inverter, then convert to higher voltage using a step-up transformer. Later voltage being step-up again to approx 1kV using voltage multipliers!
I know how it works, just that I don't have the schematics...
If anyone happen to have or reverse engineered the circuit, please post the schematics...