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Originally Posted by Roberts
There are rx and tx parts directly coupled. I have been seen something simillar in the past only cant remember exactly where?
I guess this part (middle of schematic) is taken from some old md bfo project.Probably from those in patents database.
Should search trough databases to find exact match. Designer, here used simpliest possible bfo approach and added sort of direct receiver (down part of schematic).
So it seems receiver is able to pick only eventuall differences in balance occured in metal vicinity.
I guess this will somehow "detect" some metal. Logically metal in coil vicinity will slitly disturb
balance....
So far it looks just as pretty rough and obsolete approach,taken from some old patent from early XX century.
This will continue...
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Hi Roberts,
Excellent observations! Please continue. It will be interesting to hear your ideas about the two separate detection curcuits.
Best wishes,
J_P