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Hello colleagues, let me ask if the coils need to be shielded? because I null it to 10-12 mV, but by shielding them pin 1 of tl072 I can't null them below 90 mV. is it normal or am i doing something wrong? I did not put a capacitor on the RX because it works fine without it. I tested with 22nf but the discrimination cannot be adjusted and rather cuts non-ferrous metals. The capacitor of the TX is 330nf 16V wave. The device operates at 8.4kHz.TX 1mH & RX 12mH but after I shilded is 12.9mH. Any assumptions?ThanksComment
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Aaa.. and after shielding I get a double signal at indication.Comment
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You should shield both coils mandatory. Don`t mention if the fine balance cannot be achieved. The device works fine even with wide range of balance deviation. And don`t put the capacitor in parallel of Rx - it is non-resonance machine. You need to achieve/to see the phase reaction on the oscilloscope when you approach the coil with ferrous metal and amplitude reaction, when approaching non-ferrous metal.
If you do all properly, the result will you pleasantly impressed. It works reliable like "Kalashnikov", so keep going...Comment
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thanks for your help getsa
Can you tell me what is the normal depth of the device? For example a 1 euro coin.To know the capabilities of the device. now catches them at 25-28 cm. Thanks again
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Your current depth result is OK.Comment
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Tx 1 mh 3 ohm 330 nf.. rx 12 mh 30 ohm 33 nfComment
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The device works well for coins but does not detect large non-ferrous metals. When I passed with the big object, a strong signal is indicated on tl072 pin 7 but there is no sound indication at all. Has anyone had a similar problem and if so can it be fixed?Comment
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Hello colleagues! I want to ask if I do Rx 7.6mH (instead 12mH)will I lose depth?Comment
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You need to change capacitor thenComment
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Capacitor on TX ? I don put parallel capacitor on RX and is work fineComment
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