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   tekha

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 LiveInternet.ru:
: 16.05.2007
:
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: 25

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guarda.ru N03

, 21 2007 . 15:55 +

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S1, 2-3 300 . . S2 1. ! ...





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Miniature Loop Alarm (By Tomaz Lazar - Ljubljana, Slovenia)

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Geomagnetic field detector

This basic oscillator will detect the Earth magnetic field. The ferrite rod and coil are taken from an old Medium Wave receiver and a small magnet is glued at one end. Tune to a medium wave commercial station until you hear a beat note ...



Seismic detector

The piezoelectric element of a kitchen gas lighter is used in this simple, yet effective seismic detector. The piezo element must be placed vertically, one end solidly to ground ...








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http://www.tehnoidei.com.ru/
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