How to choose a metal detector?
In general, a multitude of metal detector designs have been created - from primitive amateur circuits to professional models, where the 'thinker' can be more complex than the 'brains' controlling the engine in your car. There is enough material here for a separate article, so let's just skim the surface. First of all, two fundamentally different methods of processing information are distinguished. In analog metal detectors, everything is simple: there is an exceeding of the set signal threshold – we send an audio alert to the headphones. The advantages of such circuits are considered to be their speed, but you will have to master the level of a guru in adjustment and also imagine yourself as an underwater acoustic specialist of a submarine to get the device to do what you need and decode information from it literally by ear. A digital metal detector, roughly speaking, thinks for the owner and therefore may lag a bit between detection and notification. However, this...