Post project 46: Alternative Touch Switch
November 14, 2014
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For a change, this simple touch-sensitive switch does not operate
by detecting the resistance of the skin between two points or
measuring the change in capacitance, but
it reacts to heat instead. The negative
temperature coefficient of a silicon
diode is utilized for this purpose.
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Diodes are normally used to rectify signals, but they are also suitable for other applications. Here we use a property which is normally considered to be undesirable, namely that an ordinary silicon diode has a negative temperature coefficient of about –2 mV/°C.
Don't miss any project, take out a free membership to Elektor.POST now!
Diodes are normally used to rectify signals, but they are also suitable for other applications. Here we use a property which is normally considered to be undesirable, namely that an ordinary silicon diode has a negative temperature coefficient of about –2 mV/°C.
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