Some good material
Generally of a higher level than most hobbyist directed sites
Worth a look

        http://www.techlib.com/index.html

eg Detailed article on home-made ion chambers for radiation detection.

        http://www.techlib.com/science/ion.html


"Curious C beeper" - highly useful capacitance measurer

        http://www.techlib.com/electronics/c_beeper.html

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