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  • Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.

Sounds familiar

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spuffock

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Ground a bit of aluminium foil, put a drop of salt water on it, and dip a piece of copper wire connected to a high impedance input of an audio amplifier.
Heard it before?
 
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