  Weekend Projects reader Robert writes in with his version of
the Treasure Finder, a homemade metal detector, including custom
board mods and alternative wire coil material. I don’t know
where Robert lives, but I hope it’s near lots of treasures, and
he cuts us in on any hoards he finds!  I completed this project
in about 4 days. I made things harder for myself by not
bothering with an etched circuitboard, just wired up on
perfboard. Worked first time though!  My capacitors on the coils
are very temperature sensitive. If I touch them with my finger,
the tone goes crazy. Not sure if this is because I fried them
when soldering though. I was going to use a friends oscilloscope
but when I wired things up, it just worked and I could fine tune
with the brass locknut.  Great guide!  For the coils I used
30SWG ‘kynar wire’ instead of magnet wire as that’s all I could
find.  I rushed things near the end as I wanted to be able to
take it out and try it. Couldn’t resist adding a power LED
though.  Well done, Robert! Ha