This circuit allows you to read resistors up to 20 M ohms, converting it into voltage. The circuit is from the 90s. The operational ones used admit modern equivalents.
This circuit is from Linear Technology 2005 documentation. The circuit is based on company...
This circuit was found in RCA documentation from the 90s. It consists of a power control for a...
This diagram from a 1967 documentation shows how to switch high voltage neon lamps with 5V TTL...