If you need about 12,000 volts DC for an ion generator this circuit might be the ticket. It draws power from the 120vac power line but it uses a small 6KV camera flash trigger coil. The output signal is isolated from the power line. Although the circuit can only deliver about 5uA of current it can produce dangerous shocks, so be careful.
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http://www.discovercircuits.com/DJ-Circuits/12v.htm
http://www.elecfree.com/electronic/low-power-12000-volt-power-supply/
