I know it a bit off topic for many,but amongst electronic enthus.,in general looking for info on this subject,circuits,software etc. myself being enthus., in electronics,metal detection,etc.Have posted in many other various forums in aust.and recieve only scant info if anything of value.on the subject. maybe ,just maybe?may be a member here who knows a little or a lot whom I can correspond with?or has some curcuit detail for home construction?? thanks.