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During a spate of ozone investigation I bought a few different rechargeable ozone generators intended for deodorising cupboards, wardrobes and small rooms, and also keeping fridges sterile by killing surface bacteria.
One works really well, but another was defective from the start and this one started off OK despite some design weirdness, but then failed with a faint crackling noise.
In this video I reverse engineer it, find the cause of the problem affecting many of these units and hack it to run directly on USB with no battery. (The battery MUST be removed if the USB hack is applied.)
Note that the "wind" noise when I held the ozone generator up to the microphone was the ionic breeze that would normally be moving a decent amount of air through the corona discharge and out into the area being sterilised. In this product it's been encased in a badly designed product where the designer didn't really understand the operation and blocked the airflow with an unventilated recess and fine mesh.
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