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Offline xiehengjun
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« Reply #360 on: December 02, 2017, 02:58:17 pm »
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Thank you for your help，I set it high, it put my battery protection mode, no longer work.Is this a power trimmer potentiometer?I replaced those two resistors to make it effective.

Posted on: December 02, 2017, 02:41:01 pm
Thank you very much for your help，Special thanks to the administrator's patience help for me.thanks
My detector video
27 cm coil and a 2.8cm bronze coins, the depth of 60cm

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« Reply #361 on: December 02, 2017, 04:52:59 pm »
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Good Stuff.   What your going to do now that you have it working ?

Posted on: December 02, 2017, 04:47:24 pm
No not directly effecting the Power but as it affects the ON time of the TX yes it is controlling the power to the coil .  Working somewhat like PWM.  Longer On Time = more Voltage and Current.

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https://www.arduino.cc/en/Tutorial/PWM


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« Last Edit: December 02, 2017, 04:54:36 pm by homefire » 		Logged
Offline xiehengjun
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« Reply #362 on: December 02, 2017, 05:04:59 pm »
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Unable to dig, our land here has been frozen，In spring, I would like to team up to find the treasure that Japanese plunder did not bring back during World War II.And some of the treasures left by my country in ancient times，Now I am preparing some tools to prepare for my spring plan. Here are some of the old coins I dug this fall, a kilo.
I have some questions, sir, do you know what PCB is in the picture?

Posted on: December 02, 2017, 05:03:34 pm
Thank you for your answer

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« Reply #363 on: December 02, 2017, 05:21:00 pm »
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  Never seen it brought up before.  How is the Chines Government on Metal Detecting there ?  Many Rules and Regulations ?

Posted on: December 02, 2017, 05:18:24 pm
  Looks like you have a Factory going on there !  LOL

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Offline xiehengjun
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« Reply #364 on: December 02, 2017, 05:31:33 pm »
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Our country does not allow unauthorized testing, but not very strict, but not allowed to trade.
I do not have a factory, this picture is a friend sent to me, this thing is to resist high-pressure EMI interference, and if I have this information I would like to create a，
Do you have a good way to shield EMI?
EMI will make my detector keep screaming and I want to solve this problem. In addition, I completed DBP and I want to equip it with a large coil, after which I would like to build GOLDSCAN 4 and make a recognizable Small coil

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« Reply #365 on: December 02, 2017, 06:09:59 pm »
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  Just enclose it in a Shielded enclosure.  Shield with Graphite Paint or Copper tied to the Ground.  Something like this.   

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Offline xiehengjun
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« Reply #366 on: December 03, 2017, 12:53:51 am »
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Thank you very much, but I think this may not work, because the size of the coil determines EMI interference. This approach may not work.

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« Reply #367 on: December 03, 2017, 06:50:19 am »
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nobody protects detector from EMI. just a coil is transmitting EMF. you must learn electronics. graphite layer for coil and box is enough
and gives enough protection against ESFI.

good way if you tune PI on even value of frequency of your electric net. so if you have 50Hz good PI freq will be 100Hz.
for US customers of my PI boards I suggest to use 120Hz/pps.



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Offline xiehengjun
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« Reply #368 on: December 03, 2017, 11:32:49 am »
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Thank you for your valuable comments, I will adjust my PI according to your ideas.

Posted on: December 03, 2017, 11:16:51 am
I think you are selling your XR-71, do not know if there is a video, you can watch the video?

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« Reply #369 on: December 05, 2017, 05:51:49 am »
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do you mean my video or in general?
why you need in the video?

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