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Perfect Multi-Coil Design
With this construction it is possible finding deep large objects and small stuff at the same time and it has a very good pinpoint ability, too!
The layout is important!
The coils are concentric circles and not radiation energy-destroying destorted DDs! But the layout in the end is "eliptic" for most efficient search-movements!
Both coils are one third shifted for minimal influence from the center coils.
The big 30cm/12inch coils should cover the range until 2-3meters / 6-9feet while the middle coils will find objects from zero to 40cm/16inch.
Of course there have to be 2 different detection circuits using unique kHz frequz. and fitting power.
I suggest to use very thin wire for the central-coils and also for the outside ones, just thick enough for granted stability and not going hot by the voltage and power. If the power is not really strong enough, a thicker wire is absolutly meaningless, costs more weight and makes the sensitivity balance more complicated because of more near metal.
The shielded cable from coil to detector must have at least 8 wires but better are 10, including ground-wire and LED power 5V! 'Cause near the pinpoint-center-hole of the coil there should be attached some ultrabright LEDs for more convinient work - and for low-light condition-hunts.
If I have the time I will built this Multi-Coil by myself but of course you are free to built it also - if you can!
I don't wanna make a big secret or copyrighted stuff out of it - I have my good reasons for this...
If you wanna make now the big money out of it - just go ahead and we will see how it developes!
But for now this is open source and hopefully it will inspire the MD-engineers so sometimes in the near future alot detectors will use this design!
Because it has alot improvements compared to the most if not all other coil-layouts and it's capable of Multi-Search - small-shallow AND large-deep objects!
This coil won't weight alot but you still can find very deep stuff plus very little things by best pinpointing! And it uses the most efficient, because concentric coil-shapes!
Have Fun! 
The layout is important!
The coils are concentric circles and not radiation energy-destroying destorted DDs! But the layout in the end is "eliptic" for most efficient search-movements!
Both coils are one third shifted for minimal influence from the center coils.
The big 30cm/12inch coils should cover the range until 2-3meters / 6-9feet while the middle coils will find objects from zero to 40cm/16inch.
Of course there have to be 2 different detection circuits using unique kHz frequz. and fitting power.
I suggest to use very thin wire for the central-coils and also for the outside ones, just thick enough for granted stability and not going hot by the voltage and power. If the power is not really strong enough, a thicker wire is absolutly meaningless, costs more weight and makes the sensitivity balance more complicated because of more near metal.
The shielded cable from coil to detector must have at least 8 wires but better are 10, including ground-wire and LED power 5V! 'Cause near the pinpoint-center-hole of the coil there should be attached some ultrabright LEDs for more convinient work - and for low-light condition-hunts.
If I have the time I will built this Multi-Coil by myself but of course you are free to built it also - if you can!
I don't wanna make a big secret or copyrighted stuff out of it - I have my good reasons for this...
If you wanna make now the big money out of it - just go ahead and we will see how it developes!
But for now this is open source and hopefully it will inspire the MD-engineers so sometimes in the near future alot detectors will use this design!
Because it has alot improvements compared to the most if not all other coil-layouts and it's capable of Multi-Search - small-shallow AND large-deep objects!
This coil won't weight alot but you still can find very deep stuff plus very little things by best pinpointing! And it uses the most efficient, because concentric coil-shapes!
Have Fun!
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