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While looking into the early electrolytic rectifiers inspired by tiny-tims post in the "Question about polarized capacitors" thread, I got to thinking about these mechanical vibrators used in early auto radios for generating a.c.
http://www.redwoodradio.com/images/Radio_Vib_400.jpg
I bet there are a few old members here that remember them?
http://www.redwoodradio.com/images/Radio_Vib_400.jpg
I bet there are a few old members here that remember them?