Hi
I have built Morgan's IR circuit with the beeper/led at the output.
I have built Morgan's IR circuit with a needle indicator at the output.
I have built a modulated input IR receiver by the use of a transmitter IR led and a very selective high Q LC at the front end.
I have built a differential receiver which eliminates all the problems of the previous devices when you change angle of scanning.
Net conclusion: When it comes to metal detection, it is one of the worst methods i have ever experimented with. I wish i could take back my time money and efforts.
