capacitive probe - Búsqueda para electrónicos
If the unit is brought close to a live conductor (insulated, and even buried in plaster) capacitive coupling between the live conductor and the probe clocks the counter, and causes the LED to flash 5 times per second, because the 4017 IC divides the mains 50Hz frequency by 10. When remote from a live line, the unit stops counting, the LED resulting permanently off........
http://www.circuit-finder.com/categories/tools-and-measuring/current-and-voltage/739/live-line-detector-indicator-circuit-schematic
http://www.circuit-finder.com/categories/tools-and-measuring/page-3
https://bestelectronickit.blogspot.com/2010/08/vhf-oscillators-for-overtone-crystals.html
http://electronics.dapj.com/search/label/Proximity-Switches
https://felicinwiring.blogspot.com/2013/04/preamp-stage-for-ceramic-phono.html
A high quality broadcast stereo transmitter for the FM band
http://www.ludens.cl/Electron/fmtx/fmtx.html
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