I am looking of a small metal detector schematic that would be sensitive to small gold. I would like one that would lend its self to a pin pointer configuration so I could use it to scan crevices and holes at the river. Could anyone suggest a detector that would be good for this. It doesn't need to have a discrimination circuit but that would probably be nice. I would like to make the coil about the diameter of a broom stick. thanks
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small gold pin pointer question
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thats close to what I am after. I am thinking of a small vlf or PI detector that I can belt mount or mount on a broom stick, ect. The prob can be attached to the end of the stick and used for checking bedrock. May be something like a Compadre with a very small coil. I dont know how well that would work but you probably get the idea. A PI detector might be better at looking through the black sands that are likely to be associated with the gold.
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What you want is possible. But not an easy diy. For the vlf you need a sensitive circuit with good ground balance. There are schematics on this forum of the Fisher goldbug and a Tesoro Gold Demon capable of sensing small gold. Then you would need to wind induction balanced probe coil. This will be a challange.
For the PI approach maybe build a "Surf PI", kits are sold by Silverdog. Lots of info on the forum. Then see this by "BBsailor" about making a PI probe using soft ferrite. http://www.findmall.com/read.php?34,1678444. More complex pi circuits you can build are the GS4 and the SD2000.
You will need basic tools and oscilloscope etc.
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