Adjustable, Audible Continuity Tester For Delicate Circuits
William B. Mcalister · NASA Tech Briefs · 1988
Unit adjustable to resistances up to 35 ohms. Adjustable, audible electrical-continuity tester gives audible indication. Used safely on circuit boards in which semiconductor components installed, and on complementary metal oxide/semiconductor integrated circuits. Tester compact and circuit simple. Built from inexpensive standard components.