The touch lamp; a neat idea, and older than you'd think!
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Further reading 1
Caption notes
A touch lamp detects changes in capacitance. The presenter compares a circuit tuned to a particular lamp with a module that establishes a baseline at power-up and responds to a change from that level.
Archived captions (transcription method unspecified) ↗Original passages · 2
your body’s capacitance affects the circuitit establishes its baseline capacitance