Title Short description
Crystal radio receiver v2 Radio receiver without power supply.
Darkness detector Darkness detector with photo resistor and NE555.
GSM phone ring detection This device will blink LED just before GSM phone will ring.
GSM sniffer Locate a GSM phone.
Heat detector using NE555 and diode Heat detector using NE555 and a diode.
Lie detector v1 Very simple lie detector.
Metal detector Another metal detector.
Rain detector Rain or water detector.
Short circuit detector Detects open and short circuit conditions.


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