Mettle Detector circuit Diagram

This is a mettle detector circuit diagram.We have used Ic4093 for this circuit.This circuit needs a a Faraday shield, which is connected to 0V.To make this one wrap a tin foil around the coil.and connect to 0v.Then you can use this circuit for find metal.Tune your mw radio until whistle sound comes.




Note
# This circuit operates with 12V power supply
# IC1d pin 11 needs to be attached to a MW radio aerial, or should be wrapped around the radio
# The prototype used 50 turns of 22 awg/30 swg (0.315 mm) enamelled copper wire, wound on a 4.7"/120 mm former. This was then wrapped in insulation tape.

Laser Barrier Detector

This is some what different circuit.But this is so simple circuit.Some times some people have used some security systems by using lasers you can use this one for detect those beams.what you have to do is attaching more than 10 LDR for a stick when you walk send it before you.Then it will detect those barriers.








# supply 6v for this circuit.
# Don't use this one for unnecessary things.