FREEZER_FAILUREALARM

Published:2009/7/14 22:54:00 Author:Jessie | From:SeekIC

Loudspeaker is energized by 4011 audio oscillator and 2N2222 transistor operating from 9-V battery when ice melts and allows permanent magnet to drop on reed switch and close it. Magnet is bonded to wall inside of freezer with mixture of antifreeze and water.-J. A. Sandier, 11 Projects under $11, Modern Electronics, June 1978, p 54-58.



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