Metal Detector Build Recommendations

Hello Everyone,

I'm new to the forum and metal detecting as well. I recently received a Bounty Hunter Tracker iv for Christmas and I'm enjoying it. My Dad is now interested in getting into metal detecting as well and I thought that building him a good detector would be a nice birthday gift for him. I have some experience with electronics such arduino and I can solder pcb boards, so I'm confident that I could build one without too much trouble. We live in New England and we'd mostly be detecting around old cellar holes and going to the beach once in awhile. I've been looking through the site and learning about the different detectors that some people are building here and I was hoping I could get some advice on which models would work best for what we'll be using it for.

Considering the above could you all recommend a few models of detectors with recent links to their schematics?

Thank you in advanced!

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Metal Detector Build Recommendations