This high voltage module contains a very traditional, but simple circuit to boost the mains supply voltage up to several thousand volts at low current.
I screwed up. I showed the 220nF capacitor on the PCB photo between the transformer pads. It should be on the two ones to the left.
The resistor I added in experimentaly was 33K 2W.
I also forgot to show a close-up of an unsleeved carbon fibre emitter. It's just the stripped wire and a bundle of carbon fibre strands laid into a brass crimp, which is crimped and sleeved with heat shrink sleeving.
The eBay listing title of the item shown is:-
AC 220V Car Air Purifier Negative Ion Ionizer Anion Generator Airborne Modules
Although designed for 220V (Chinese standard voltage) this unit will work on 120V at much lower output (and much longer life). For 230V to 240V it may be useful to add a 1W 10K to 33K resistor in series to make the life of the internal resistors easier.
If building this into a plastic enclosure to make an ioniser/ionizer I'd recommend adding a couple of 1 megohm 1W/2W resistors in series with either each output lead or just one pair in series with the general output, splitting to all the emitters again after the resistors. That provides an extra layer of safety for anyone touching the emitters.
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