I have been doing some research on building my own bug zapper circuits for use in an artwork challenge (just for arcing electricity, I'm not killing any bugs), in particular finding an excellent supply for transformers. I have found a number of firms selling transformer based spark igniter kits which also sell the transformer individually. Both circuits are based around utilizing a transformer in flyback mode, and feature some kind of transistor based oscillator on the input, which create the AC voltage necessary to construct up cost in the transformer coil. In a single case this is thru a 555 oscillator, in the other it's using the inductance of the additional transformer faucet to toggle the transistor on and off. The distinction is primarily at the output. The bug zapper features a filter network to create a differential DC charge between the two sides of the coil, whereas the spark igniter simply has an open circuit. The difference in result's that the bug zapper produces an occasional pop, when the DC large becomes massive sufficient to jump the dielectric hole, whereas the spark igniter produces a continuous stream of electricity at the frequency of the enter oscillator.
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