Hello Qiaozhi;
We'll I tell you the truth,I do not think the " unit has been assembled, tuned and tested for maximum performance.". Initially when i received the board,only the volume and sensitivity pots seem worked.If i moved the volume or sens pot ,i could control the threshold volume. But,although the components were soldered very well,the person who assembled the unit forgot to solder one of the cables of the threshold pot,it only came with two cables soldered,instead of the three.It took me more than a day to figure out why the detector could not control the threshold tone.It was missing the third cable to the board.After i soldered the pot correctly i could control the threshold,but it still would not detect any metal.
We'll I tell you the truth,I do not think the " unit has been assembled, tuned and tested for maximum performance.". Initially when i received the board,only the volume and sensitivity pots seem worked.If i moved the volume or sens pot ,i could control the threshold volume. But,although the components were soldered very well,the person who assembled the unit forgot to solder one of the cables of the threshold pot,it only came with two cables soldered,instead of the three.It took me more than a day to figure out why the detector could not control the threshold tone.It was missing the third cable to the board.After i soldered the pot correctly i could control the threshold,but it still would not detect any metal.
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