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Hi, I built the C. Rakes Two Box MD this week and after working out the mistakes I made on the circuit, I am getting it to detect metal.
Here is the problem: When I throw a large metal paint thinner can on the lawn and take the two box over it, It does not detect the can which is about 1 foot below it. I then squat down lower and get the metal detector only inches from the can and it does not detect it.
Is there something wrong with my circuit? I can take the 2box over to a propane grill and hold it horizontal to the ground and it will detect that at about 1 foot away. I also took the 2 box over a 3'x3' metal table and it will detect that facing the ground but at 4 feet high and it will detect the table at about 1 foot away.
Then I take the 2box and set it on the ground sideways in the yard and I take the metal paint thinner can hold it in my hand and it will detect it through the air about 2-3 feet away.
This is a simple circuit with 3 2n3904 transistors and I was wondering, does it need some kind of ground balance or is my circuit not amplifying the signal enough. I can't find anything wrong with my circuit except I grounded the 2 potentiometers(works grounded or ungrounded). Also, I can never get the meter to go below 20 microfarads even using the RF Gain Potent. When using the RF Gain Potent., the meter will go all the way to max if I turn it clockwise, but when I turn RF Gain counterclockwise, the needle comes down to 20 and then I turn RF Gain all the way to counterclockwise minimum and the needle goes back up to 30 or 40 mf. Is this how RF Gain is supposed to work on Induction Balance Detector?
Is it the ground mineralization that is interfering with the circuit because if I cannot detect this large paint can size object on top of the ground, how will it detect through the ground? Or is the thinner can too small? Please help. Thanks for your help.
Here is the problem: When I throw a large metal paint thinner can on the lawn and take the two box over it, It does not detect the can which is about 1 foot below it. I then squat down lower and get the metal detector only inches from the can and it does not detect it.
Is there something wrong with my circuit? I can take the 2box over to a propane grill and hold it horizontal to the ground and it will detect that at about 1 foot away. I also took the 2 box over a 3'x3' metal table and it will detect that facing the ground but at 4 feet high and it will detect the table at about 1 foot away.
Then I take the 2box and set it on the ground sideways in the yard and I take the metal paint thinner can hold it in my hand and it will detect it through the air about 2-3 feet away.
This is a simple circuit with 3 2n3904 transistors and I was wondering, does it need some kind of ground balance or is my circuit not amplifying the signal enough. I can't find anything wrong with my circuit except I grounded the 2 potentiometers(works grounded or ungrounded). Also, I can never get the meter to go below 20 microfarads even using the RF Gain Potent. When using the RF Gain Potent., the meter will go all the way to max if I turn it clockwise, but when I turn RF Gain counterclockwise, the needle comes down to 20 and then I turn RF Gain all the way to counterclockwise minimum and the needle goes back up to 30 or 40 mf. Is this how RF Gain is supposed to work on Induction Balance Detector?
Is it the ground mineralization that is interfering with the circuit because if I cannot detect this large paint can size object on top of the ground, how will it detect through the ground? Or is the thinner can too small? Please help. Thanks for your help.
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