Hello,
Yesterday, when I was making some tests on my Etrac with my coins I accidentally noticed that when I put the coil near my ear I can hear a very silent but noticeable sound of the coil (as if it was working - of course Etrac was on). The same was when I changed to my Sunray probe. I also change the coil to 8" and still the same. Then I disconnected the probe and use only the Procoil - the same.
During Noise Cancel the sound changes as I guess the machine changes the frequencies. Is it normal behaviour - I mean the sound of the coil or the probe when the Etrac is on?
To check if it is normal I made the same tests with my Fisher F75 (which I still own but will go to sell it - for me Etrac much better) and the coil with the Sunray probe - both of them were silent - no sound.
Can sb of You make the same test with Your Etrac and check it is normal with it or only my machine likes to softly talk
and maybe it needs a visit to a doctor...
Thanks in advance.
Sorry for my English- it's not my native -I'm from Poland.
Regards,
radhar
Yesterday, when I was making some tests on my Etrac with my coins I accidentally noticed that when I put the coil near my ear I can hear a very silent but noticeable sound of the coil (as if it was working - of course Etrac was on). The same was when I changed to my Sunray probe. I also change the coil to 8" and still the same. Then I disconnected the probe and use only the Procoil - the same.
During Noise Cancel the sound changes as I guess the machine changes the frequencies. Is it normal behaviour - I mean the sound of the coil or the probe when the Etrac is on?
To check if it is normal I made the same tests with my Fisher F75 (which I still own but will go to sell it - for me Etrac much better) and the coil with the Sunray probe - both of them were silent - no sound.
Can sb of You make the same test with Your Etrac and check it is normal with it or only my machine likes to softly talk
and maybe it needs a visit to a doctor...Thanks in advance.
Sorry for my English- it's not my native -I'm from Poland.
Regards,
radhar
. I have some small brick power supplies and they make a high pitched noise when in operation- not very loud or noticeable unless you place your ear near it Nothing to worry about in my opinion. Minelab probably didn't think it was important to add the extra weight to insulate it. Wonder if some other multifrequencies also do it such as the V3i (though they could possibly move it into the box instead). Not everyone can hear this high pitched noise. Personally I can tell when an old cathode ray tube TV is left on with the door closed or across the house and its muted (its the flyback transformer that makes the noise in that case). Doubt Minelab is using a flyback in the coil though (though lightweight ones have been used commercially)- stongly suspect Hipower switching mosFets, etc though. If its a constant high pitched humming then maybe some sort of flyback whereas a high pitched with a slight ticking then probably Hi power mosfets/ switching. Either way wouldn't worry about it so long as there isn't any burning smell.