The smell is ozone, it is rather odd to associate it with freshening the air, or generalized health benefits. Still, the lesson on cascade multipliers was welcome, and we found the smoke-clearing power of ionized air pretty amazing. We’d have preferred to see at least an isolation transformer in there, or perhaps a battery-powered flyback circuit to supply the input to that multiplier. Neither of those bothers us as much as the direct 230-volt mains connection, though. Or perhaps ’s critics are dubious about the benefits of ionized air indeed, some commenters on the video below seem to think that the smoke in the closed jar was not precipitated by the ion stream as claims, but rather somehow was settled by heat or some other trickery. That’s sure to raise eyebrows, or possible the hair on one’s head if you happen to brush by the emitters. We imagine a fair number of the complaints stem from the cluster of sewing needles that bristle from one end of the PCB and are raised to 6,000 volts by a fifteen-stage Cockcroft-Walton multiplier. When dropped this in the Hackaday tip line, he indicated that he’d been taking some heat for the design from Instagram followers. So he built his own air ionizer for only about $10. A minor industry has sprung up to capitalize on the interest in ionized air, and while wanted to clean up the Mumbai air coming into his home, he didn’t want to pay a lot for a commercial unit. Have you ever had a good, deep breath of the air near a waterfall, or perhaps after a thunderstorm? That unmistakably fresh smell is due to ionized air, specifically negative ions, and many are the claims concerning their health benefits.
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