Calling Power supply gurus

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Re: Calling Power supply gurus

Post by MikeDB » Thu Sep 10, 2020 5:17 pm

KSS wrote:
Thu Sep 10, 2020 1:20 am

Most electrolytics can actually withstand up to about half their rated WV in the reverse direction. Best when this is an AC usage, but some caps have been discovered by techs in decades old gear which were soldered in backwards when manufactured.
Some types of brand new electrolytics have one side of the foil anodised with a DC current during production but if gently reverse biased from new the other side of the foil will often, though not always, anodise, hence reversing the polarity. But this doesn't work with the cheaper etched foil types which don't need a DC current to anodise them, it being done chemically.

Key word though is gently. Apply a reverse voltage without severe current limiting and the results are spectacular/dangerous.
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Re: Calling Power supply gurus

Post by Midiot » Sun Sep 13, 2020 1:59 am

lol... reverse polarity capacitors: you've been foiled !!
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