Hello,
I am looking for a small component or circuit to make a touch switch of an aluminum shell. Circuitry inside the shell would only be active while somebody is touching the shell. When not touched I need minimal battery drainage.
Tom Hubin snipped-for-privacy@earthlink.net
DigiKey sells a single-IC solution to this, from Quantum research group. Look at QT118 for a low-power part. They work pretty well. From a human factors point of view, you can do two interesting things:
(1) make a pushbutton that apes/felony inmates/severe abuse cannot kill
(2) make a pushbutton no one knows is there
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