An Electronic Tester for Logic Circuits

摘要

The conventional method of testing logic circuits is irritating and time consuming. Described here is a tester which does not have those difficulties. A lamp is illuminated for logic state #x2018;1#x2019; and is extinguished for logic state #x2018;0#x2019;. PNP transistors are used for negative logic and NPN transistors for positive logic. Similar circuits can be used for visual checking of the counting sequence of a binary counter.