This is very simple EMF detector. Modified (by Melih Karakelle) from here. Two Schottky diode (BAR10, 1N5711, etc.) for rectifier, an Op-Amp (LM10), a cap (100 nF), a resistor (1 Mohm), triger level adjust trimpot (220 Kohm), a driver transistor (BC550). Operated with 3 V battery (2 x AA). Very simple and working good. Can detect/find a cell phone (GSM) about 30-50 cm (when RF propagation), electricity cable (on load), tv/monitor etc…
Have an amazing project to share? Join the SHOW-AND-TELL every Wednesday night at 7:30pm ET on Google+ Hangouts.
Join us every Wednesday night at 8pm ET for Ask an Engineer!
Learn resistor values with Mho’s Resistance or get the best electronics calculator for engineers “Circuit Playground” – Adafruit’s Apps!
Maker Business — “ORANGE PI: MEETING WITH STEVEN ZHAO IN SHENZHEN”
Wearables — Putty in your hands
Electronics — Multimeter Bandwidth – AC Signal
Biohacking — Google Searching for “My Eyes Hurt” Peaked After Yesterday’s Eclipse
Sorry, the comment form is closed at this time.