The circuit shown is from the November 1996 Electronics Now magazine. The basic circuit is in the previous 3 sections of this section. The circuit measures resistances up to 2M ohms.
This circuit for photography uses was found in the Electronics Experimenter Handbook Special...
It is like to the previous circuit with a lock that keeps the LED on at the end of the timer. The...
This circuit, with two operationals, was obtained from an old American publication. Operational...