Quote:
Originally Posted by FrancoItaly
Hi HOBBIT
Tune P1 for about 3Mhz, tune P2 for about 1-6V (AC signal) at point X and at pin2 (phase comparator output) a DC signal 0.5-6V. This is not a metal detector and hand tests serve little. As I said and I repeat here there is no other way to test the lrls, you must have a long buried metal that is in same place at least a few months (for my experience) or to know a place where there is surely a long buried metal. An empirical system is exploiting the compass effect, you need to adjust the gain towards the maximum sensitivity until you have the compass effect then you have to lower the gain until it disappears. This happens with my lrl.
Best Regards
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Hi Franco.
Yesterday i tried to adjust the lrl properly.
It was unable to make it oscillate at 3 Mhz so i replace the capacitor from 68p to 47 pf.
Now output at pin 3,4 is square signal 3 mhz. Signal at point X is triangular 6V but at pin2 is not DC but a not clear triangular. Is it right???
Regards