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Offline tomari
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« Reply #800 on: February 22, 2015, 02:52:32 pm »
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hello, can anyone explain what bar1 bar2 and bar3 means in the attachment??

one more question:
 LCD reset is needed every time you power on the metal detector or just the first time?



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« Reply #801 on: February 22, 2015, 04:33:15 pm »
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many thanks Xavier for the information .

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« Reply #802 on: February 27, 2015, 04:50:10 am »
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hi for all .i have made some adjustement to my dp .now is better than before .with coil 40cm i can detect an object 15×15 at 30cm .do you think it's normal?and what would be the good results?.thakyou for all

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« Reply #803 on: March 09, 2015, 07:13:00 am »
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hello.i need your help  i want to make a New coil diameter 40cm with  awg #21.please can you help me to find what would the number of turns?.thank you advanced

 

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« Reply #804 on: March 09, 2015, 08:10:36 am »
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Quote:Posted by mazari
hi for all .i have made some adjustement to my dp .now is better than before .with coil 40cm i can detect an object 15×15 at 30cm .do you think it's normal?and what would be the good results?.thakyou for all

If you use a wire of gauge of 0.8mm coil diameter 300mm-320mm with an inductance of 250 to 300 uH (that's about 24 turns) you should be able to detect your 15 x 15 cm object at well over 30 cm more like 45 cm. Also remember that you need to tune the detector with the tree trim pots, do you have an oscilloscope? 

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« Reply #805 on: March 09, 2015, 08:44:43 am »
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thank you Xavier for your quick reply.ihaven't an oscilloscope.i want to make a coil with 40cm diameter with 0.8mm not 30cm.thank you again


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« Reply #806 on: March 09, 2015, 11:48:08 am »
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Same thing 250 - 300 uH but you will need to use less turns. If you do not have an oscilloscope then I suggest that you download one like this at 

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   it will do what you need it to do.

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« Reply #807 on: March 09, 2015, 12:18:48 pm »
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many thanks xavier.i appreciate your help

Posted on: March 09, 2015, 12:13:11 pm
hi xavier .i want more inductance in my coil to reach more dept .what do you suggest? .please advise me.thank you

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« Reply #808 on: March 09, 2015, 01:27:38 pm »
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More inductance will NOT give you more depth, you have to have a precise inductance the design of the detector also for the speed (decay time) , power, frequency, reception (TX is same as RX) of the coil also this is why many fail at making a good detector. You will have to have a very good understanding of the detector that you are building before you can start to design your own coils but go for it, that's how you will learn just be prepared to make a lot of them. Always keep an eye on the FET that it does not get too hot (heat = power consumption = less operating time) or burned FET

Posted on: March 09, 2015, 08:26:35 pm
I for got to say that you will have to change the damping resistor for your new coils.

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« Reply #809 on: March 10, 2015, 04:27:48 am »
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thank you xavier .i agree with you that all these factors that you mentioned above have an affect of the sensivity of the detector .  please can you  give me what can i change  to improve my dp?.i use :for r5:680 ohm /1watt.r6:1k.c1:22n. cd 4066.CD14538.lf357.tl082.do you think that i use a good component?.

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