This simple logic level tester was found in Radio Electronics from the 90s. The inverters are of the 4009 type and the power comes from the circuit being analyzed.
This circuit is intended for the testing of junction FETs, providing several reading options...
This circuit was found in a General Electric documentation from 1965. The circuit is full wave for...
August 2017 - Heat sinks for use with Arcol / Aluminum resistors can be obtained from Mouser...