Quote:
Originally Posted by gold24h
A bfo metal detector circuit with an exturnal coil generates an rf,long time buried metal at a distance will disturbe the rf in the coil,you can hear this little disturbance with an fm raido where the antenna is near the coil.I am building a unit but i do not know how to set the radio,do you set to a empty channel or one brodcasting?
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Yes, is in the list and others many posts by me:
ACTIVE
1. I/B + RF sniffer (active + passive)
2. Off-resonance + RF sniffer (active + passive)
3. Other kind of MD + RF sniffer (active + passive)
4. IR beam + RF sniffer (active + passive)
5. Ultrasonic beam + RF sniffer (active + passive)
6. IR laser beam + RF sniffer (active + passive)
7. Other type based on emission + RF sniffer...
8. Etc.
Here, RF sniffer can be simple FM radio.