I rustled up this simple electronic circuit:
Thomas Scarborough’s electronics design have been popular. Here, therefore, is a “super simple” SONAR (designed by him).
Thomas Scarborough has designed a new embodiment of the CCO (Coil Coupled Operation) metal detector, a new genre which he invented in 2004. This is the first IC design to appear on the Internet (there is a transistor design on many websites, and IC designs were published by Elektor and EPE). It took me just eight minutes to design this — which illustrates the simplicity of the principle.