Minimalist Induction Balance Metal Detector
Construction — the PCB
Construction — search coil assembly
The constructing of the coils takes you into the much dreaded realms of ‘mechanical construction’ although some would argue for ‘tin- kering away on a Sunday afternoon’. What- ever, it will present a welcome change from handling your soldering iron and those com- ponents you know so well. Below is a search head description (as suggested by the author) which we have no reason to question for veracity! Because a pic- ture tells more than a thousand words, refer- ence is made to Figure5. Both coils are identical. If you can get it, use 33SWG (0.26mm) enamelled copper wire, winding 100turns in a clockwise direction on a circular 15cm diameter former. The wire diameter is not critical — anything between 0.2mm and 0.3mm will do just ﬁne. The coil is then temporarily held together with stubs of insulating tape passed under it and pressed together over the top. It may be jumble- wound. A second coil is wound in the same way. Each coil is then tightly bound by wind- ing insulating tape around its entire circum- ference.