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#1
09-26-2009, 05:56 PM
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The ground battery
Similar process occurs with good conductive metals buried for long time. You need high Z earphones. This is very sensitive. If you touch connections of it and put near a 50 Hz iron solder, you'll hear the 50 (or 60 Hz)... near a 50% of a LM386 level, for example, BUT WITHOUT BATTERY.
PM, March 1906. 
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