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That's a customized transformer made for that specific product to work with that specific circuit. 100,000) for pennies a chunk. You cannot use just any "6-lead transformer" in a circuit like this because the transformer is tuned for the circuit - it's the guts of the oscillator. Even when you designed the circuit your self, and knew the precise spec's you want for the transformer, the NRE is going to be at minimal tons of of dollars. So your transformers are going to be pricy in small portions. In other words, buying complete mosquito racquets will probably be much cheaper than spec'ing a buyer transformer. Personally, the circuit shown is very poor, very unstable, and tough to get functioning correctly. It's deceivingly simple wanting. A greater thought would be to get HV generators on your application. As a compromise, the circuitry that generates the HV ignition in xenon flash cameras ought to get you in the ball park. If you really want to deal with your personal design, I would start with a 3-terminal high-voltage set off transformer. Way easier to use and most simple oscillator circuits will run it, more so than the crappy bug zapper circuit which was designed to be as low cost as potential to the purpose the place it can't be any cheaper.
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