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With reference to pulse induction machines, Is it a good/bad idea to connect the coil shield to circuit ground? From my experience so far: no. bad idea.
I just tried this with my Surf PI 1.2 kit + 11in Minelab GP Series DD coil the other day and had some weird behaviour before a complete failure. The circuit just pulses the Tx coil so I am using the coil in "mono" mode. I am trying to make the detector run quieter and so tried the experiment of connecting a wire from circuit ground to the coil connector. I could be wrong but was assuming this then connected to the cable's outer shielding and to the coil's graphite paper shield, linking everything together.
Results I collected were brief around 15 seconds but in the time the detector was still running, it picked up some engine noise from a car driving down the street. Sort of sounded like a "bub bub bub bub" sound. Normal audio tone then started sounding all distorted. Disconnected wire from coil connector, detector now doesn't detect anything. I haven't yet surveyed the damage to find what failed.
Is the more common practice to have the circuit ground separate and have the case shielded and connected to the coil shield thru the coil connector?
Not sure if what I have encountered here is a particular quirk of this circuit and/or coil but would like to know more of what the correct practice is.
I just tried this with my Surf PI 1.2 kit + 11in Minelab GP Series DD coil the other day and had some weird behaviour before a complete failure. The circuit just pulses the Tx coil so I am using the coil in "mono" mode. I am trying to make the detector run quieter and so tried the experiment of connecting a wire from circuit ground to the coil connector. I could be wrong but was assuming this then connected to the cable's outer shielding and to the coil's graphite paper shield, linking everything together.
Results I collected were brief around 15 seconds but in the time the detector was still running, it picked up some engine noise from a car driving down the street. Sort of sounded like a "bub bub bub bub" sound. Normal audio tone then started sounding all distorted. Disconnected wire from coil connector, detector now doesn't detect anything. I haven't yet surveyed the damage to find what failed.
Is the more common practice to have the circuit ground separate and have the case shielded and connected to the coil shield thru the coil connector?
Not sure if what I have encountered here is a particular quirk of this circuit and/or coil but would like to know more of what the correct practice is.
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