A Darlington pair is sufficiently sensitive to respond to the small
current passed by your skin and it can be used to make a touch-switch as
shown in the diagram. For this circuit which just lights an LED the two
transistors can be any general purpose low power transistors. The 100k
resistor protects the transistors if the contacts are linked with a
piece of wire.
source : Sorry friend I can't remember where i found page on internet. I copied this from my Old saved Pdf document. :D
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