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Did coil have water damage? Are you getting poor detection distance? C13 is on pcb.
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Maybe adjust Rx null with Rx disconnected from circuit?, only tx connected. I see quad op amp lmv65x.
10v peak to peak is good for tx? How do you know?Comment
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no, it did not. owner did 'hear' a sound of moving something inside. opened the coil to see that, it was a termoglue drop.
he threw away it and got the problem - abnormal work in pinpoint mode.
i do not touch nothing on the board.Comment
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Was the loop(2x3cm) glued down or did it become loose. Try nulling Rx with small loop at different location across the Rx windings and not across bucking windings. This will affect phase of Rx.Comment
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Small loop placed across Rx windings will change inductance of Rx ever so slightly. Your problem with coil is Rx resonance(tuning), not nulling.Comment
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Sounds like the coil might not be the problem, at least the null seems OK. Those are the "cheap" coils that are made in China and are not especially good quality, you might want to look closely to see if shield paint got applied to bare wire joints. Ideally try another coil.Comment
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this is MINE LOOP I MADE. DB i do not KNOW what loop there was and how it seems. i show finished position of balance and have to test the coil on the ground.Originally posted by dbanner View Post
believe me - i did 4 weeks of only changing the location and only experimenting with copper pieces and wires. while owner does mobile call me every day and demands to do faster.Comment
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Sorry KT, didn't know all the facts. Try placing coil in sunshine for couple hours. Could be moisture problem. May sound ridiculous, but maybe worth a try.Comment
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just got a call from owner. he told his buddy student measured all power line on voltages. it was ok.
then owner did turn on and the detector has been back pinpoint mode. also he tuned a trimmer on board.
he noticed my coil was tuned sure right and gave thanks.Comment
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