Thank you my dear for your reply
About DD-coil, Please let me see how to make it for pulse induction metal detector.
For the resistance, I think 2.5-3.5 Ohm is very big, because Pulsdetektor.de explain in their Digger metal detector for search coil, and this MD is the next of Miner 4,And it has same power circuit design (HCPL3120,BUP314,Suppressors),they said the resistance should be between 1.8-2.5 Ohm.
This still for along with metal detector, as they produce Base2-Orion, they said it should be between 1.6-2.5 Ohm.
Note that for Minipuls3 MD the resistance around 3 Ohm.
Don't forget that the coils are Flat Spiral Coils, that mean, it's difficult to reach the 2.5 Ohm with their number windings.
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« Last Edit: September 27, 2014, 11:56:06 pm by waseem2005 »