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Based on the usage of capacitors, condensators. Alternatively, utilizing the derivative of signals.

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Simple short range object proximity identification using capacitive sensing

Capacitance between two plates depends on the distance between them. So, no this won't work.
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2 votes

Purpose of electronic elements in a capacitive dropper circuit

The circuit you provided is borrowed from this answer I gave to a question you posed earlier. I borrowed it from a blog post I wrote a couple of years ago about cheap LED bulbs. In that answer, I ans …
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7 votes
Accepted

Why is this camping light deadly?

They almost always fail open, but do you want to bet your life that a company that builds a capacitive dropper powersupply with user accesible connections will also think to use a Y rated capacitor? …
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