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In honor of tariq.ahmad 's emphasis on magnetism this month, I thought I would do a little experiment involving the Magnetostrictive Phenomenon. Magnetostriction is a property of a ferromagnetic material whereby it changes shape when it is subjected to a magnetic field. Anyone who has worked with transformers is familiar with the low frequency 50 or 60 Hz hum that can usually be heard coming from the transformer. This is an undesirable magnetostrictive effect that is causing the hum and a subse ...
Karen's Learning Circuit Presentation:   The Learning Circuit 39: Inductor Project: Battery Juicer   got me to playing around with the Battery Juicer Circuit also called the "Joule Thief". You can check out her blog for a schematic and some suggestions. For her build she made a flashlight but I had other ideas for a good use.   When I finally crash at night I put my watch next to the bed. Unfortunately it is quite dark in the room so if I wake up and want to know what time it ...