The search coil of this detector consists of 140 turns of wire 18 in an 8 inch diameter form. The circuit is from an old documentation. The earset is ceramic or crystal and can be powered by batteries.
The search coil of this detector consists of 140 turns of wire 18 in an 8 inch diameter form. The circuit is from an old documentation. The earset is ceramic or crystal and can be powered by batteries.
