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Hi. Thanks for reaching out. I have seen the same problem with a couple of circuit boards sent to me from a friend and changed chips and checked the soldering under a magnifying glass. Never got to the root cause unfortunately. I have found the board mounted potentiometers can fail so my first suggestion would be to replace to test them.

@@caledonianprospector1412 😞My device works normally, but there is not the same slight sound as exhalation at the end. And what about the file you created. And I made a file of 25 centimeters, the depth of the coin is 22 centimeters, only a very small depth

@@lablackmohammedbilal3868 I have found that can happen with different piezo buzzers. I use lower voltage rated ones if I remember correctly which can make a difference. Try measuring the output voltage on your buzzer with a voltmeter and see what you are getting then change the piezo to match it. I think I use 5v one on mine

@@caledonianprospector1412 I use buzzers but I don't know how much voltage I will try to try other buzzers

@@lablackmohammedbilal3868 not sure where you live but Ebay have a range of them. I just checked and I have used 3v or 3 to 24v piezo buzzers in the past

I've used it mainly for field detecting and not used in anger. Generally finding old coins, bits of farm machinery and occasionally old railway engine parts on fields by a railway. Not used it for nugget detecting as haven't sought permission on or around rivers with them. It's not great on beach sand as there is too much interface from the salt water and I use a pulsed induction machine for beaches

Shouldn't do as the detector responds to the moving object. I have tested some gold burried in my garden and the detection depth is even better. Can't rule it out I guess.

Manuel D. Ferreras G. I should update this with my latest coil. I found the coil could be any shape or size but always tended to need around 19 - 20 turns of wire. My latest coil will pick up a 6g gold nugget at 7 inches

Caledonian Prospector. what is the awg size of the wire?

Manuel D. Ferreras G. I'll check for you. I tried different diameter wire but overall it did not make much difference as long as I tuned the multimeter with the potentiometer to 0 volts.

Just to follow up. The wire size I most prefered for these coils after testing a few different sizes was 0.45 mm 26 SWG copper. Its robust enough to hold its shape

Hi. What do you think about the coil made of utp network cable ? Any recommendation? since that wire is easy to get

Cheers Danny. It was a great trip and hoping to do another next year all going well