Urban Ministry Live And Unplugged
A Window On Urban Ministry In Southern Africa
Friday, September 2, 2016
I was reminded this morning of a LED flasher I designed, which literally ran off "thin air", and caused quite a splash at the time. Here it is (pictured). Note that it is Copyright © Wimborne -- I have special permission to show it here (it also appears in my book). It is in two parts, which are wired together as shown: a diode pump (top), and a flasher (bottom). Wire terminal A to the coaxial cable of a TV aerial, or to several metres
yards of coaxial cable strung up in the air. I succeeded with as little as three metres, but this depends on location. I was also able to power the flasher off modestly sized burglar bars, and in some cases (depending where I was standing) off my own body. Connect terminal B to earth -- this is absolutely essential. Use tantalum for the capacitors, and use only those components exactly which are specified in the diagrams. The circuit would also run off a 9V battery with a 10M resistor in series, so if the battery were of a high enough quality, you would not need to replace it in your lifetime. Keep in mind that the diode pump will need several seconds to "pump up".
What this really shows is the amount of electromagnetic noise that passes through us all day long. It is enough to flash a LED -- probably several LEDs. Wire a dynamic microphone or speaker to terminals A and B, and the noise of a party might power the flasher.
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