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IF it does cause damage I will be the first to know. :laugh: I ran my GPX very close to a major train line in my area. Trains energize the tracks a while before and after they use them. You only get small intervals of nice quiet time between them. So I found a setting (207) that chatters so quickly that I can actually hear some targets above the chatter. That is the only way I can use it at this site. If that doesn't ruin my GPX (or my ears) nothing will. The results of yesterday's 8 hour hunt were 8 silvers and one gold earring and a lot of clad and wheat cents. I probably still have EMI radiating from my body :smile:

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So, when I practice playing with the buttons and settings on my detectors, I just disconnect the coils, then there's nothing to overload. Moreover, for the detectors with a higher learning curve (lots of sub-menus, etc.), this is an excellent way to scroll through functions and learn the ropes (the settings, etc. with no access to any coil functions or metal detecting capability of course).

All the best,

Lanny

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2 hours ago, Lanny said:

So, when I practice playing with the buttons and settings on my detectors, I just disconnect the coils, then there's nothing to overload. Moreover, for the detectors with a higher learning curve (lots of sub-menus, etc.), this is an excellent way to scroll through functions and learn the ropes (the settings, etc. with no access to any coil functions or metal detecting capability of course).

All the best,

Lanny

On some of the old detectors I thought you could cause damage if the unit was turned on without a coil connected. Maybe just an urban legend???

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Not advisable to run a detector without a coil attached. Depending on the design, it could cause damage to the transmitter circuitry.

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Well, that would be poor electronic design if that was the case?   The send/receive would be a broken connection if the coil isn't connected, I don't see how any damage could be done unless the circuit board itself wasn't regulated or involving transient suppression but even then if the voltage isn't going out, it's not coming back in to do any damage....  Where did you hear running a detector with no coil could cause damage?  Not trying to attack you there but it has to be wrong information you've been given.

The current out to the coil isn't an open dam flooding the coil with power that will build up and blow up your transmitter circuitry.

I'd imagine it's like a power point in your wall in your house, some people believe if you leave the switch on with nothing plugged in your wasting power :laugh:  If nothing is drawing the power, no power is used.  It doesn't leak into air like a dripping tap.

It's why manufacturers say you can plug in a coil from a different detector if it fits, it won't damage your detector but your results may vary...

 

 

 

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It just depends on the device.

If you unplug a DC motor while operating, the motor stops nothing happens. Unplug a stepper motor while operating, the driver fries. Do they have fancy drivers that won't burnout when disconnected during use? Yes, but they may cost over 10 times as much.

Both these motors used in this example are inductors (similar to a detector coil) being currently implemented in 2018 designs controlled by modern solid state devices.
Some may chose to save money vs having the ability to yank wires out from operating machinery.

There are probably a lot of older detectors that should stay plugged into the coils just to be safe. Most newer detectors are probably safe to remove, but read the manual to be sure. They coil is part of some sort of circuit, even though it's interchangeable.

Unplugging the speakers from a stereo tube amplifier or guitar amplifier can be catastrophic, it doesn't mean it's a bad design. The speaker is "removable" by necessity, to physically locate the speaker away from the amplifier, (sound familiar?) this lead to this modern way of thinking that we should be able to do something that wasn't originally intended. This probably started with the quick disconnects as typically wires attached to speakers with screws give the impression that they are semi permanent. The speaker or coil IS part of a system, it's not a peripheral device even though it can be detached by the user.

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I would like Geotech to chime in on this one, I'm sure he would give a clear answer, people often forget to tighten their coil connector which causes falsing, it would be disappointing if the detector was designed in a way where a poor coil connection or no connection at all damaged the control box.  I would possibly be more concerned with a detector from the 70's than a modern one.

I hope they don't start putting motors in detectors 🙂 unless they put a pull start like a lawn mower, that'd be cool!  It would give that raw power feeling I get when I swing my T2, only even more powerful...

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I was analogizing VLF detectors to RF transmitters, where I learned as a kid to never key the transmitter unless the antenna or a dummy load was connected, or you would probably blow out the final stage of the transmitter.  I just googled the issue and it still seems to be accepted as prudent practice today even with modern designs (with RF transmitters).

https://www.eham.net/ehamforum/smf/index.php?topic=79031.0

It would depend on the design, but unless I knew for certain that it was safe to run a detector without a load, I just would not do it.

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I think my Deep Tech Vista Gold says not to turn on the detector without a coil attached, as it can damage the unit. But honestly, I may do that anyways :laugh:

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17 hours ago, phrunt said:

I would like Geotech to chime in on this one, I'm sure he would give a clear answer, people often forget to tighten their coil connector which causes falsing, it would be disappointing if the detector was designed in a way where a poor coil connection or no connection at all damaged the control box.  I would possibly be more concerned with a detector from the 70's than a modern one.

I hope they don't start putting motors in detectors 🙂 unless they put a pull start like a lawn mower, that'd be cool!  It would give that raw power feeling I get when I swing my T2, only even more powerful...

A motor is an inductor.

A coil is an inductor.

The analogy is that unplugging an inductor in a modern device while running may result in damage to certain driving circuitry, unless additional protections are applied.

Someone looking to maybe restore or play with an old, or unknown detector may want to keep the coil plugged in, that's all. 

If you need Geotech to give you a clearer answer, then maybe deep down you're not so sure? 😉

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