I have been doing some research on building my own bug zapper circuits for use in an art project (just for arcing electricity, I'm not killing any bugs), in particular finding a good source for transformers. I have found several companies selling transformer based spark igniter kits which also sell the transformer individually. Looking at the circuit for these spark igniters, I see that the two designs are quite similar in their functionality:
Both circuits are based around using a transformer in flyback mode, and feature some sort of transistor based oscillator at the input, which create the AC voltage necessary to build up charge in the transformer coil. In one case this is through a 555 oscillator, in the other it's using the inductance of the extra transformer tap to toggle the transistor on and off.
The difference is mainly at the output. The bug zapper includes a filter network to create a differential DC charge between the two sides of the coil, whereas the spark igniter just has an open circuit. The difference in result is that the bug zapper produces an occasional pop, when the DC large becomes large enough to jump the dielectric gap, whereas the spark igniter produces a continuous stream of electricity at the frequency of the input oscillator.
Would modifying the spark igniter to work as a bug zapper be as simple as adding the output circuitry from the bug zapper, or are there additional factors to take into consideration?
Thanks for your help, this subject is not very well documented online so any information is much appreciated.